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Review ARTICLE
Genetics of Parkinson´s disease: Recessive forms
Genética en la efermedad de Parkinson: Formas recesivas
P.A. Sallesa,b,c,
Corresponding author
psalles@cetram.org

Corresponding author at: Corporación CETRAM, Santiago, Chile.
, X. Pizarro-Correaa,d, P. Chaná-Cuevasa,e
a Centro de Trastornos del Movimiento (CETRAM), Santiago, Chile
b Sección de Trastornos del Movimiento, Departamento de Neurología, Clínica Alemana, Santiago, Chile
c Sección de Trastornos del Movimiento, Departamento de Neurociencias, Clínica Dávila, Santiago, Chile
d Servicio de Neurología, Clínica Universidad de Los Andes, Santiago, Chile
e Facultad de Ciencias Médicas, Universidad de Santiago de Chile, Santiago, Chile
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="s0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0025">Introduction</span><p id="p0005" class="elsevierStylePara elsevierViewall">Parkinson&#39;s disease &#40;PD&#41; is a progressive neurodegenerative disease characterised by such motor symptoms as bradykinesia and rigidity resulting from the progressive loss of dopaminergic neurons in the substantia nigra&#46; Common non-motor signs include hyposmia&#44; constipation&#44; REM sleep behaviour disorder&#44; and depression&#46; Age and certain genetic and environmental factors are known risk factors for PD&#46; Pathogenic variants with a demonstrated causal role are rare in the general population&#44; although risk variants are more common&#46; Study of genetic characteristics of PD sheds light on molecular and pathophysiological aspects of the disease and may lead to new therapeutic targets&#46;</p><p id="p0010" class="elsevierStylePara elsevierViewall">PD is diagnosed before 40&#8239;years of age in 3&#37;&#8211;5&#37; of patients&#59; this is the cut-off point used by some research groups to define early onset &#40;other researchers use a cut-off point of 50&#8239;years&#41;&#46; Genetics is thought to play a more significant role in early-onset PD&#46;<a class="elsevierStyleCrossRef" href="#bb0005"><span class="elsevierStyleSup">1</span></a></p><p id="p0015" class="elsevierStylePara elsevierViewall">Homozygous or compound heterozygous autosomal recessive genetic variants demonstrated to cause monogenic early-onset PD with typical or &#8220;pure&#8221; characteristics include&#58; &#40;1&#41; parkin&#44; or RBR E3 ubiquitin protein ligase &#40;<span class="elsevierStyleItalic">PRKN</span>&#41;&#44;<a class="elsevierStyleCrossRef" href="#bb0010"><span class="elsevierStyleSup">2</span></a> &#40;2&#41; PTEN-induced kinase 1 &#40;<span class="elsevierStyleItalic">PINK1</span>&#41;&#44;<a class="elsevierStyleCrossRef" href="#bb0015"><span class="elsevierStyleSup">3</span></a> and &#40;3&#41; parkinsonism-associated deglycase &#40;<span class="elsevierStyleItalic">PARK7</span>&#44; also known as <span class="elsevierStyleItalic">DJ-1</span>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bb0020"><span class="elsevierStyleSup">4</span></a> Although these genes are rare in the general population with PD&#44; they explain approximately 13&#37; of cases with onset before the age of 40&#8211;50&#8239;years&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> Specifically&#44; <span class="elsevierStyleItalic">PRKN</span> is considered the most common cause of monogenic early-onset parkinsonism&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> In juvenile cases &#40;onset before 21&#8239;years of age&#41;&#44; variants of <span class="elsevierStyleItalic">ATP13A2</span>&#44; <span class="elsevierStyleItalic">FBXO7</span>&#44; <span class="elsevierStyleItalic">PLA2G6</span>&#44; <span class="elsevierStyleItalic">SYNJ1</span>&#44; and <span class="elsevierStyleItalic">DNAJC6</span> may also play a role&#46;</p><p id="p0020" class="elsevierStylePara elsevierViewall">This study reviews the basic molecular mechanisms and relevant clinical characteristics of autosomal recessive monogenic forms of PD&#46;</p></span><span id="s0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0030">Review</span><span id="s0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0035">Genes associated with autosomal recessive early-onset Parkinson&#39;s disease with typical manifestations</span><span id="s0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0040">PRKN</span><span id="s0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0045">Function of the parkin protein</span><p id="p0025" class="elsevierStylePara elsevierViewall">Parkin belongs to a protein family with a preserved ubiquitin-like &#40;UBL&#41; domain and RING &#40;&#8220;really interesting new gene&#8221;&#41; finger motifs&#46; Parkin functions as a multifunctional cytosolic E3 ubiquitin ligase&#44; and catalyses the transfer of ubiquitinated molecules to multiple substrates&#46; Through mono- and poly-ubiquitination chains linked by lysine-48 or lysine-63&#44; the protein is involved in signalling protein degradation and in non-degradation processes&#46; Parkin indirectly mediates PGC-1&#945;&#44; which regulates the expression of genes involved in mitochondrial biogenesis and antioxidant activity&#46;</p><p id="p0030" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">PRKN</span> and <span class="elsevierStyleItalic">PINK1</span> encode proteins involved in a quality control system that &#8220;checks&#8221; the autophagy of depolarised and defective mitochondria &#40;mitophagy&#41;&#46; Parkin is self-inhibited in normal conditions&#44; and is activated to induce mitophagy&#46; This process is triggered by accumulation of PINK1&#44; a serine&#8211;threonine kinase located on the mitochondrial outer membrane&#46; PINK1 is involved in the phosphorylation of ubiquitin molecules&#44; triggering the recruitment of parkin due to its affinity for phosphorylated ubiquitin&#46; By binding to phosphorylated ubiquitin&#44; PINK1 is able to phosphorylate parkin at the UBL domain&#44; activating its catalytic action&#46; The generation of new mitochondria-bound ubiquitin molecules and their phosphorylation by PINK1 results in a positive feedback mechanism&#44; with further recruitment of parkin&#46; Parkin-mediated ubiquitination of mitochondrial proteins leads to the recruitment of mitophagy receptors&#46; <span class="elsevierStyleItalic">PRKN</span> and <span class="elsevierStyleItalic">PINK1</span> have also been linked to processes other than autophagy&#44; such as the production of mitochondrial-derived vesicles that transport damaged cargo&#44; and the suppression of mitochondrial antigen presentation&#46;<a class="elsevierStyleCrossRef" href="#bb0030"><span class="elsevierStyleSup">6</span></a></p></span><span id="s0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0050"><span class="elsevierStyleItalic">PRKN</span> molecular mechanisms associated with Parkinson&#39;s disease</span><p id="p0035" class="elsevierStylePara elsevierViewall">The simplest explanation of the pathophysiological mechanism associated with this gene is physiological loss of function of parkin&#44; resulting in accumulation of substrates&#44; and mitochondrial dysfunction due to the alteration of the genetic pathway shared with <span class="elsevierStyleItalic">PINK1</span>&#46;<a class="elsevierStyleCrossRef" href="#bb0035"><span class="elsevierStyleSup">7</span></a></p></span><span id="s0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0055"><span class="elsevierStyleItalic">PRKN</span> variants</span><p id="p0040" class="elsevierStylePara elsevierViewall">Pathological variants of <span class="elsevierStyleItalic">PRKN</span> include substitutions of individual base pairs&#44; small deletions&#44; splice-site mutations&#44; and deletions of hundreds of nucleotides&#46;<a class="elsevierStyleCrossRef" href="#bb0040"><span class="elsevierStyleSup">8</span></a></p><p id="p0045" class="elsevierStylePara elsevierViewall">The penetrance of homozygous and heterozygous&#47;compound heterozygous <span class="elsevierStyleItalic">PRKN</span> variants is estimated at 100&#37; and 1&#37;&#8211;25&#37;&#44; respectively<a class="elsevierStyleCrossRef" href="#bb0040"><span class="elsevierStyleSup">8</span></a>&#59; these are considered the most common cause of early-onset PD&#44; accounting for 4&#46;6&#37;&#8211;10&#46;5&#37; of cases&#44; depending on the population studied&#46;<a class="elsevierStyleCrossRef" href="#bb0045"><span class="elsevierStyleSup">9</span></a></p></span><span id="s0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0060"><span class="elsevierStyleItalic">PRKN</span>-PD phenotype</span><p id="p0050" class="elsevierStylePara elsevierViewall">Mean age of onset of <span class="elsevierStyleItalic">PRKN</span>-PD is 31&#8239;years&#46; Onset is early &#40;20&#8211;40&#8239;years&#41; in 62&#37; of cases&#44; late &#40;&#62;<span class="elsevierStyleHsp" style=""></span>40&#8239;years&#41; in 22&#37;&#44; and juvenile &#40;&#60;<span class="elsevierStyleHsp" style=""></span>20&#8239;years&#41; in 16&#37;&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a></p><p id="p0055" class="elsevierStylePara elsevierViewall">Generally&#44; patients with <span class="elsevierStyleItalic">PRKN</span>-PD respond well to low doses of dopaminergic drugs&#46;<a class="elsevierStyleCrossRef" href="#bb0050"><span class="elsevierStyleSup">10</span></a> A review found that 94&#37; of patients respond well to levodopa&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a></p><p id="p0060" class="elsevierStylePara elsevierViewall">Dystonia&#44; dyskinesia&#44; and motor fluctuations were reported in 18&#37;&#44; 19&#37;&#44; and 15&#37; of cases&#44; respectively&#46; Strikingly&#44; up to 46&#37; presented dystonia not induced by levodopa&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> However&#44; dystonic gait disorders were reported as the initial symptom in 5 out of 18 patients&#46;<a class="elsevierStyleCrossRef" href="#bb0055"><span class="elsevierStyleSup">11</span></a> Gait disturbances secondary to biphasic dyskinesia are also a more frequent initial symptom in <span class="elsevierStyleItalic">PRKN</span>-PD&#46;<a class="elsevierStyleCrossRef" href="#bb0060"><span class="elsevierStyleSup">12</span></a> Levodopa-induced motor fluctuations and dystonia are more frequent in homozygous or compound heterozygous carriers than in heterozygous carriers of <span class="elsevierStyleItalic">PRKN</span> variants &#40;94&#37; vs 69&#37; and 70&#37; vs 40&#37;&#44; respectively&#41;&#46;<a class="elsevierStyleCrossRef" href="#bb0065"><span class="elsevierStyleSup">13</span></a></p><p id="p0065" class="elsevierStylePara elsevierViewall">In a review&#44; tremor was reported in 31&#37; of patients with <span class="elsevierStyleItalic">PRKN</span>-PD&#44; and was absent in 3&#37;&#46; This information was not reported in the remaining 66&#37;&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> Postural instability is reported in 17&#37;&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> Atypical manifestations are rare&#44; with antero-&#47;retrocollis&#44; pyramidal signs&#44; spasticity&#44; and alien hand syndrome being reported in only 3&#37; of cases &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>32&#41;&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a></p><p id="p0070" class="elsevierStylePara elsevierViewall">The prevalence of cognitive impairment is estimated at 1&#46;5&#37;&#8211;13&#37;&#44;<a class="elsevierStyleCrossRef" href="#bb0070"><span class="elsevierStyleSup">14</span></a> similar to the rate reported in the population aged over 65&#8239;years&#46;<a class="elsevierStyleCrossRef" href="#bb0075"><span class="elsevierStyleSup">15</span></a></p><p id="p0075" class="elsevierStylePara elsevierViewall">Psychotic symptoms are reported in 17&#47;45 and depression in 48&#37; of patients with <span class="elsevierStyleItalic">PRKN</span>-PD&#46;<a class="elsevierStyleCrossRef" href="#bb0075"><span class="elsevierStyleSup">15</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0080"><span class="elsevierStyleSup">16</span></a> Presence of at least one symptom of impulse control disorder seems to appear at approximately the same rate as in idiopathic PD&#44; although compulsive shopping&#44; binge eating&#44; and punding&#47;hobbyism are more common in <span class="elsevierStyleItalic">PRKN</span>-PD&#46;<a class="elsevierStyleCrossRef" href="#bb0085"><span class="elsevierStyleSup">17</span></a> Autonomic dysfunction occurs in 32&#37; of patients with <span class="elsevierStyleItalic">PRKN</span>-PD&#46;<a class="elsevierStyleCrossRef" href="#bb0075"><span class="elsevierStyleSup">15</span></a><a class="elsevierStyleCrossRef" href="#t0005">Table 1</a> summarises the phenotypes of autosomal recessive monogenic PD&#46;</p><elsevierMultimedia ident="t0005"></elsevierMultimedia></span></span><span id="s0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0065">PINK1</span><span id="s0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0070">Function of the PINK1 protein and molecular mechanisms associated with Parkinson&#39;s disease</span><p id="p0080" class="elsevierStylePara elsevierViewall">See sections &#8220;Function of the parkin protein&#8221; and &#8220;PRKN molecular mechanisms associated with Parkinson&#39;s disease&#8221;&#46;</p></span><span id="s0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0075"><span class="elsevierStyleItalic">PINK1</span> variants</span><p id="p0085" class="elsevierStylePara elsevierViewall">Dozens of variants have been described&#44; with the majority being nonsense point mutations&#46; Penetrance is age-dependent&#44; although&#44; as with <span class="elsevierStyleItalic">PRKN</span>&#44; it seems to be complete in carriers of biallelic pathogenic variants&#46;</p><p id="p0090" class="elsevierStylePara elsevierViewall">The prevalence of these mutations is not known&#46; They are thought to be the second most frequent cause of early-onset PD&#44; and account for 3&#46;7&#37; of cases&#44; ranging from 0&#46;6&#37; in European populations to 13&#46;5&#37; in Asian populations&#46;<a class="elsevierStyleCrossRef" href="#bb0045"><span class="elsevierStyleSup">9</span></a></p></span><span id="s0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0080"><span class="elsevierStyleItalic">PINK1</span>-PD phenotype</span><p id="p0095" class="elsevierStylePara elsevierViewall">The mean age of onset of <span class="elsevierStyleItalic">PINK1</span>-PD is 32&#8239;years &#40;onset is early&#44; late&#44; and juvenile in 62&#37;&#44; 22&#37;&#44; and 15&#37; of cases&#44; respectively&#41;&#46; Tremor is present in 51&#37; of patients and absent in 9&#37; &#40;data not reported in 40&#37;&#41;&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> Postural instability is observed in 26&#37;&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a>Ninety-nine percent of patients respond well to levodopa&#44; with 39&#37; presenting dyskinesia&#44; 21&#37; dystonia&#44; and 34&#37; motor fluctuations&#46; Dyskinesia and dystonia are related to levodopa treatment in 85&#37; and 24&#37; of cases&#44; respectively&#46; Dystonia is not associated with levodopa in 59&#37; of cases&#44;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> and was the initial symptom in 3 out of 4 patients with early-onset PD who were homozygous for <span class="elsevierStyleItalic">PINK1</span> variants&#46;<a class="elsevierStyleCrossRef" href="#bb0090"><span class="elsevierStyleSup">18</span></a></p><p id="p0100" class="elsevierStylePara elsevierViewall">After exclusion of cases with missing data&#44; patients with <span class="elsevierStyleItalic">PINK1</span>-PD presented cognitive impairment in 14&#37;&#8211;33&#37; of cases and psychotic symptoms in 2 out of 41 cases&#46;<a class="elsevierStyleCrossRef" href="#bb0075"><span class="elsevierStyleSup">15</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0080"><span class="elsevierStyleSup">16</span></a> Depression was reported in 59&#37;&#44; and autonomic dysfunction in 46&#37;&#46;<a class="elsevierStyleCrossRef" href="#bb0075"><span class="elsevierStyleSup">15</span></a></p></span></span><span id="s0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0085">DJ-1</span><span id="s0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0090">Function of the DJ-1 protein</span><p id="p0105" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">DJ-1</span> encodes a small protein that is ubiquitously expressed as a homodimer in the cytoplasm&#44; mitochondria&#44; and nucleus&#46; DJ-1 reacts to oxidative stress&#44; sensing&#44; and neutralising reactive oxygen species&#46; It also has chaperone&#44; protease&#44; and glycosylase functions&#46; Furthermore&#44; it is a transcription regulator and RNA-binding protein&#44; and regulates mitochondrial function&#44; autophagy&#44; and norepinephrine and dopamine homeostasis&#46;<a class="elsevierStyleCrossRef" href="#bb0095"><span class="elsevierStyleSup">19</span></a></p></span><span id="s0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0095">Molecular mechanisms associated with Parkinson&#39;s disease</span><p id="p0110" class="elsevierStylePara elsevierViewall">The L166P variant is expressed as a monomer&#44; losing its physiological functions and acquiring pro-apoptotic properties&#44; with reduced lysosomal activity and mitochondrial damage&#46;<a class="elsevierStyleCrossRef" href="#bb0095"><span class="elsevierStyleSup">19</span></a></p></span><span id="s0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0100"><span class="elsevierStyleItalic">DJ-1</span> variants</span><p id="p0115" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">DJ-1</span> variants are rare&#44; accounting for 1&#37;&#8211;2&#37; of sporadic cases of early-onset PD&#44; although they are thought to represent approximately 5&#37; of cases of early-onset PD in the Indian population&#46;<a class="elsevierStyleCrossRef" href="#bb0100"><span class="elsevierStyleSup">20</span></a></p></span><span id="s0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0105"><span class="elsevierStyleItalic">DJ-1</span>&#8211;PD phenotype</span><p id="p0120" class="elsevierStylePara elsevierViewall">Mean age of onset of <span class="elsevierStyleItalic">DJ-1</span>&#8211;PD is 27&#8239;years&#46; Onset is early&#44; juvenile&#44; and late in 83&#37;&#44; 13&#37;&#44; and 4&#37; of cases&#44; respectively&#46;</p><p id="p0125" class="elsevierStylePara elsevierViewall">Regarding motor symptoms&#44; tremor is observed in 63&#37; of patients&#44; dystonia in 46&#37; &#40;induced by levodopa in 2&#47;14 cases&#41;&#44; dyskinesia in 23&#37; &#40;mostly induced by levodopa&#41;&#44; and postural instability in 40&#37;&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> Hyperreflexia has been reported in at least 4 cases&#46; Forty-five percent of patients respond well to levodopa&#46;<a class="elsevierStyleCrossRef" href="#bb0025"><span class="elsevierStyleSup">5</span></a> Non-motor symptoms include psychotic symptoms in &#40;3&#47;4 cases&#41;&#44; depression &#40;66&#37;&#41;&#44; and autonomic dysfunction &#40;28&#37;&#41;&#46;<a class="elsevierStyleCrossRef" href="#bb0075"><span class="elsevierStyleSup">15</span></a></p></span></span></span><span id="s0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0110">Genes associated with autosomal recessive Parkinson&#39;s disease with atypical phenotypes</span><span id="s0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0115">ATP13A2</span><span id="s0100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0120">Function of the ATP13A2 protein</span><p id="p0130" class="elsevierStylePara elsevierViewall">ATP13A2 belongs to the P-type ATPase family of proteins&#44; the majority of which are cation transporters&#46; ATP13A2 regulates the metabolism and prevents the accumulation of divalent metals&#44; preventing their cytotoxicity&#46;<a class="elsevierStyleCrossRef" href="#bb0105"><span class="elsevierStyleSup">21</span></a> It has been suggested that it may also play a role in preventing intracellular accumulation of &#945;-synuclein by modulating clearance via the autophagy&#8211;lysosomal pathway&#46;<a class="elsevierStyleCrossRef" href="#bb0110"><span class="elsevierStyleSup">22</span></a></p></span><span id="s0105" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0125">Molecular mechanisms associated with Parkinson&#39;s disease</span><p id="p0135" class="elsevierStylePara elsevierViewall">Patient-derived cell models have shown low concentrations of intracellular free zinc ions&#44; impaired expression of zinc transporters&#44; and abnormal sequestering of zinc in vesicles associated with the autophagy&#8211;lysosomal pathway&#46; This would have an impact on mitochondrial energy production and lysosomal proteolysis&#46;<a class="elsevierStyleCrossRef" href="#bb0110"><span class="elsevierStyleSup">22</span></a></p></span><span id="s0110" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0130"><span class="elsevierStyleItalic">ATP13A2</span> variants</span><p id="p0140" class="elsevierStylePara elsevierViewall">More than 10 homozygous or compound heterozygous pathogenic variants have been reported to affect the protein&#39;s transmembrane domains&#46;<a class="elsevierStyleCrossRef" href="#bb0105"><span class="elsevierStyleSup">21</span></a> These variants would result in loss of function of ATP13A2 through such mechanisms as nonsense-mediated mRNA decay&#44; mislocalisation&#44; and premature protein degradation by the proteasomal system&#46;<a class="elsevierStyleCrossRef" href="#bb0110"><span class="elsevierStyleSup">22</span></a></p><p id="p0145" class="elsevierStylePara elsevierViewall">Rare <span class="elsevierStyleItalic">ATP13A2</span> variants have been associated with susceptibility to PD in exome sequencing studies&#46;<a class="elsevierStyleCrossRef" href="#bb0115"><span class="elsevierStyleSup">23</span></a></p></span><span id="s0115" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0135"><span class="elsevierStyleItalic">ATP13A2</span>-PD phenotype</span><p id="p0150" class="elsevierStylePara elsevierViewall">Disorders related to <span class="elsevierStyleItalic">ATP13A2</span>&#44; initially known as Kufor-Rakeb syndrome&#44; have been assigned to various classifications&#58; atypical parkinsonism &#40;Kufor-Rakeb syndrome or <span class="elsevierStyleItalic">ATP13A2</span>-PD&#41;&#44;<a class="elsevierStyleCrossRef" href="#bb0120"><span class="elsevierStyleSup">24</span></a> neuronal ceroid lipofuscinosis&#44;<a class="elsevierStyleCrossRef" href="#bb0125"><span class="elsevierStyleSup">25</span></a> neurodegeneration with brain iron accumulation&#44;<a class="elsevierStyleCrossRef" href="#bb0130"><span class="elsevierStyleSup">26</span></a> autosomal recessive spastic paraplegia-78&#44;<a class="elsevierStyleCrossRef" href="#bb0135"><span class="elsevierStyleSup">27</span></a> and juvenile amyotrophic lateral sclerosis&#46;<a class="elsevierStyleCrossRef" href="#bb0140"><span class="elsevierStyleSup">28</span></a></p><p id="p0155" class="elsevierStylePara elsevierViewall">Symptoms generally appear before 20&#8239;years of age&#44;<a class="elsevierStyleCrossRef" href="#bb0145"><span class="elsevierStyleSup">29</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0150"><span class="elsevierStyleSup">30</span></a> and the rate of progression is variable&#44; ranging from relatively rapid deterioration over a space of months&#44; to slower progression taking decades&#46;<a class="elsevierStyleCrossRef" href="#bb0130"><span class="elsevierStyleSup">26</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0145"><span class="elsevierStyleSup">29</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0155"><span class="elsevierStyleSup">31</span></a> These diseases typically present with some degree of parkinsonism&#44; with half of the cases presenting hand tremor&#44;<a class="elsevierStyleCrossRef" href="#bb0110"><span class="elsevierStyleSup">22</span></a> which is more frequent in carriers of the T12M variant&#46;<a class="elsevierStyleCrossRef" href="#bb0155"><span class="elsevierStyleSup">31</span></a> Postural reflexes are often absent&#46;<a class="elsevierStyleCrossRef" href="#bb0160"><span class="elsevierStyleSup">32</span></a> Patients may initially respond well to levodopa&#44; but soon develop peak dose dyskinesia and hallucinations&#44; especially in cases associated with the G504R&#44; T12M&#44; or G533R variants<a class="elsevierStyleCrossRef" href="#bb0155"><span class="elsevierStyleSup">31</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0165"><span class="elsevierStyleSup">33</span></a> In other cases&#44; levodopa is poorly tolerated&#46;<a class="elsevierStyleCrossRef" href="#bb0120"><span class="elsevierStyleSup">24</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0160"><span class="elsevierStyleSup">32</span></a></p><p id="p0160" class="elsevierStylePara elsevierViewall">Approximately&#44; half of patients developed dystonia over the course of the disease&#44; with limb involvement and in some cases risus sardonicus&#46;<a class="elsevierStyleCrossRef" href="#bb0110"><span class="elsevierStyleSup">22</span></a></p><p id="p0165" class="elsevierStylePara elsevierViewall">Pyramidal signs and spasticity&#44; predominantly in the lower limbs&#44; are also frequent&#46; Vertical gaze palsy and facial&#8211;faucial&#8211;finger mini-myoclonus are common signs&#44;<a class="elsevierStyleCrossRef" href="#bb0110"><span class="elsevierStyleSup">22</span></a> with other authors considering tongue tremor and chin trembling to be equivalent to the characteristic mini-myoclonus&#46;<a class="elsevierStyleCrossRef" href="#bb0130"><span class="elsevierStyleSup">26</span></a></p><p id="p0170" class="elsevierStylePara elsevierViewall">The clinical picture often includes dysarthria&#44; dysphagia&#44; cognitive impairment&#44; behavioural alterations&#44; psychosis&#44; and hallucinations&#46;<a class="elsevierStyleCrossRef" href="#bb0130"><span class="elsevierStyleSup">26</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0155"><span class="elsevierStyleSup">31</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0160"><span class="elsevierStyleSup">32</span></a> Ataxia and axonal sensorimotor neuropathy may also be present&#46;<a class="elsevierStyleCrossRef" href="#bb0110"><span class="elsevierStyleSup">22</span></a><span class="elsevierStyleSup"><span class="elsevierStyleBold">&#44;</span></span><a class="elsevierStyleCrossRef" href="#bb0155"><span class="elsevierStyleSup">31</span></a><a class="elsevierStyleCrossRef" href="#t0005">Table 1</a> summarises the phenotypes of autosomal recessive monogenic PD&#46;</p></span></span><span id="s0120" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0140">Neurodegeneration with brain iron accumulation&#47;hereditary dystonia&#47;<span class="elsevierStyleItalic">PLA2G6</span>-PD</span><span id="s0125" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0145">Function of the phospholipase A2 group VI protein</span><p id="p0175" class="elsevierStylePara elsevierViewall">The <span class="elsevierStyleItalic">PLA2G6</span> gene encodes phospholipase A2 group VI&#44; a protein that plays a fundamental role in regulating inflammatory processes&#44; the immune response&#44; cell membrane homeostasis&#44; mitochondrial function&#44; and membrane remodelling&#46; The protein protects mitochondria against apoptotic stimuli and has a neuroprotective effect in dopaminergic neurons&#46;</p></span><span id="s0130" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0150">Molecular mechanisms associated with Parkinson&#39;s disease</span><p id="p0180" class="elsevierStylePara elsevierViewall">It has been suggested that <span class="elsevierStyleItalic">PLA2G6</span> may be involved in PD-associated neurodegeneration due to the excessive generation of reactive oxygen species and iron accumulation associated with dysfunction of the protein&#44; a common finding in PD&#46; <span class="elsevierStyleItalic">PLA2G6</span> deficiency also results in elevated &#945;-synuclein expression in neuronal mitochondria&#46;<a class="elsevierStyleCrossRef" href="#bb0170"><span class="elsevierStyleSup">34</span></a></p></span><span id="s0135" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0155"><span class="elsevierStyleItalic">PLA2G6</span> variants</span><p id="p0185" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">PLA2G6</span> variants include nonsense mutations&#44; protein-truncating variants&#44; fragment deletions&#44; and copy number variants&#46; The link between phenotypes and genotypes suggests that changes at specific sites have different effects on protein activity&#46; Most studies find that frequent <span class="elsevierStyleItalic">PLA2G6</span> variants appear not to constitute a risk factor for sporadic PD&#44; with weak evidence of an association in Asian populations&#46;<a class="elsevierStyleCrossRef" href="#bb0175"><span class="elsevierStyleSup">35</span></a></p></span><span id="s0140" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0160"><span class="elsevierStyleItalic">PLA2G6</span> parkinsonism phenotype</span><p id="p0190" class="elsevierStylePara elsevierViewall">Phospholipase A2 group VI-associated neurodegeneration &#40;PLAN&#41;&#44; an autosomal recessive syndrome of neurodegeneration with brain iron accumulation&#44; is caused by <span class="elsevierStyleItalic">PLA2G6</span> variants&#46; This syndrome encompasses such phenotypes as classical infantile neuroaxonal dystrophy and atypical neuroaxonal dystrophy&#46; Both phenotypes often present with ataxia&#44; rigidity&#44; spasticity&#44; dystonia&#44; myoclonic seizures&#44; intellectual disability&#44; and vision problems&#46; In some cases&#44; MRI reveals cerebellar atrophy and iron accumulation in the substantia nigra&#44; the globus pallidus&#44; and sometimes in the striatum &#40;particularly in adult patients&#41;&#46;<a class="elsevierStyleCrossRef" href="#bb0200"><span class="elsevierStyleSup">40</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0205"><span class="elsevierStyleSup">41</span></a></p><p id="p0195" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">PLA2G6</span> was shown in 2008 to be the causal gene in adult-onset dystonia-parkinsonism &#40;PARK14&#41;&#46;<a class="elsevierStyleCrossRef" href="#bb0180"><span class="elsevierStyleSup">36</span></a></p><p id="p0200" class="elsevierStylePara elsevierViewall">Age of onset of <span class="elsevierStyleItalic">PLA2G6</span> parkinsonism is early &#40;mean of 19<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>11&#8239;years&#41;&#44; but the disease may appear at older ages&#46;<a class="elsevierStyleCrossRef" href="#bb0145"><span class="elsevierStyleSup">29</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0185"><span class="elsevierStyleSup">37</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0190"><span class="elsevierStyleSup">38</span></a> Limb tremor has been described as an initial symptom&#46;<a class="elsevierStyleCrossRef" href="#bb0195"><span class="elsevierStyleSup">39</span></a> Response to levodopa may be associated with early development of dyskinesia&#44;<a class="elsevierStyleCrossRef" href="#bb0195"><span class="elsevierStyleSup">39</span></a> and treatment tends to lose its efficacy or to be associated with psychosis&#46; These patients may present ataxia&#44; dysarthria&#44; dysphagia&#44; and pyramidal signs&#46;<a class="elsevierStyleCrossRef" href="#bb0190"><span class="elsevierStyleSup">38</span></a> Vertical gaze palsy&#44; apraxia of eyelid opening&#44;<a class="elsevierStyleCrossRef" href="#bb0145"><span class="elsevierStyleSup">29</span></a> and levodopa-associated oculogyric crises have also been reported&#46;<a class="elsevierStyleCrossRef" href="#bb0190"><span class="elsevierStyleSup">38</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0195"><span class="elsevierStyleSup">39</span></a> Cognitive impairment&#44; psychosis&#44; and psychiatric complaints are also frequent&#46;<a class="elsevierStyleCrossRef" href="#bb0185"><span class="elsevierStyleSup">37</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0190"><span class="elsevierStyleSup">38</span></a></p></span></span><span id="s0145" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0165">FBXO7</span><span id="s0150" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0170">Function of the FBXO7 protein</span><p id="p0205" class="elsevierStylePara elsevierViewall">FBXO7 belongs to the F-box family of proteins&#44; interchangeable subunits on the Skp&#44; Cullin&#44; F-box containing &#40;SCF&#41; E3 complex&#46; By binding to cullin-1 and RING-box&#44; it forms a multimeric E3 ubiquitin ligase in which FBXO7 acts as the ubiquitin-recruiting unit&#46; <span class="elsevierStyleItalic">FBXO7</span> has recently been reported to play a role in the autophagy of damaged mitochondria in <span class="elsevierStyleItalic">PINK1</span>-PD&#44; promoting the recruitment and ubiquitination of parkin&#46;<a class="elsevierStyleCrossRef" href="#bb0210"><span class="elsevierStyleSup">42</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0215"><span class="elsevierStyleSup">43</span></a></p></span><span id="s0155" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0175">Molecular mechanisms associated with <span class="elsevierStyleItalic">FBXO7</span> and Parkinson&#39;s disease</span><p id="p0210" class="elsevierStylePara elsevierViewall">Loss of <span class="elsevierStyleItalic">FBXO7</span> expression results in inhibition of the recruitment of parkin to depolarised mitochondria&#44; leading to dysfunction in the mitophagy process&#46;<a class="elsevierStyleCrossRef" href="#bb0215"><span class="elsevierStyleSup">43</span></a></p></span><span id="s0160" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0180"><span class="elsevierStyleItalic">FBXO7</span> variants</span><p id="p0215" class="elsevierStylePara elsevierViewall">Several <span class="elsevierStyleItalic">FBXO7</span> variants have been described&#46; For instance&#44; the R498X variant&#44; reported in multiple cases of familial PD&#44; reduces the protein&#39;s capacity to recruit parkin&#44; and the T22M and R378G variants affect binding sites&#59; no functional studies have yet been performed for the I87T&#44; D328R&#44; or R481C variants&#46; The non-coding IVS-329C<span class="elsevierStyleHsp" style=""></span>&#62;<span class="elsevierStyleHsp" style=""></span>T variant has been linked to moderate risk of PD&#46;<a class="elsevierStyleCrossRef" href="#bb0220"><span class="elsevierStyleSup">44</span></a></p></span><span id="s0165" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0185"><span class="elsevierStyleItalic">FBXO7</span> parkinsonism phenotype</span><p id="p0220" class="elsevierStylePara elsevierViewall">Patients display heterogeneous phenotypes&#44; mostly presenting with parkinsonism and signs of pyramidal involvement&#46;</p><p id="p0225" class="elsevierStylePara elsevierViewall">Symptoms usually appear between 10 and 30&#8239;years of age&#44;<a class="elsevierStyleCrossRef" href="#bb0145"><span class="elsevierStyleSup">29</span></a> although late onset &#40;41&#8211;52&#8239;years&#41; has also been reported&#46;<a class="elsevierStyleCrossRef" href="#bb0150"><span class="elsevierStyleSup">30</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0225"><span class="elsevierStyleSup">45</span></a> Levodopa was effective in 81&#46;3&#37; of cases &#40;13&#47;16&#41;&#44; and was frequently associated with dyskinesia&#44; motor fluctuations&#44; and behavioural problems&#46;<a class="elsevierStyleCrossRef" href="#bb0145"><span class="elsevierStyleSup">29</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0155"><span class="elsevierStyleSup">31</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0230"><span class="elsevierStyleSup">46</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0235"><span class="elsevierStyleSup">47</span></a> Dystonic characteristics are observed in more than half of patients&#46;<a class="elsevierStyleCrossRef" href="#bb0155"><span class="elsevierStyleSup">31</span></a> Ten &#40;10&#41; out of 16 cases of <span class="elsevierStyleItalic">FBXO7</span> parkinsonism presented action tremor&#46;<a class="elsevierStyleCrossRef" href="#bb0145"><span class="elsevierStyleSup">29</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0235"><span class="elsevierStyleSup">47</span></a> Pyramidal signs are reported in over 56&#37; of patients&#44;<a class="elsevierStyleCrossRef" href="#bb0235"><span class="elsevierStyleSup">47</span></a> and are frequently associated with spasticity and talipes equinovarus from childhood&#46;<a class="elsevierStyleCrossRef" href="#bb0230"><span class="elsevierStyleSup">46</span></a> Oculomotor apraxia and vertical gaze palsy are common&#44; as are psychiatric disorders&#46; Cognitive impairment is reported in over 43&#37; of patients&#46;<a class="elsevierStyleCrossRef" href="#bb0235"><span class="elsevierStyleSup">47</span></a> Tics and chorea have also been described&#46;</p></span></span><span id="s0170" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0190">DNAJC6</span><span id="s0175" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0195">Function of the DNAJC6 protein</span><p id="p0230" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">DNAJC6</span> encodes auxilin&#44; which is expressed selectively in neurons&#46; Auxilin acts as a co-chaperone to recruit HSC70 to clathrin-coated vesicles&#46; Its main function is in endocytosis&#44; which is crucial in regulating signalling pathways via receptor and ligand internalisation&#44; which is necessary for axon and dendrite growth&#46; It is also involved in post-endocytic recycling of synaptic vesicles&#44; and stimulates ATPase activity in many cell processes&#46;</p></span><span id="s0180" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0200">Molecular mechanisms associated with <span class="elsevierStyleItalic">DNAJC6</span> and Parkinson&#39;s disease</span><p id="p0235" class="elsevierStylePara elsevierViewall">Experimental models have demonstrated an association between degeneration of dopaminergic neurons&#44; pathological &#945;-synuclein aggregation&#44; increased intrinsic neuronal firing frequency&#44; and mitochondrial and lysosomal dysfunction&#46;<a class="elsevierStyleCrossRef" href="#bb0240"><span class="elsevierStyleSup">48</span></a> Evidence from affected patients suggests dyshomeostasis downstream from auxilin&#44; GAK&#44; and dopaminergic proteins&#46;<a class="elsevierStyleCrossRef" href="#bb0245"><span class="elsevierStyleSup">49</span></a></p></span><span id="s0185" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0205"><span class="elsevierStyleItalic">DNAJC6</span> variants</span><p id="p0240" class="elsevierStylePara elsevierViewall">Homozygous or compound heterozygous <span class="elsevierStyleItalic">DNAJC6</span> variants result in loss of function of the protein&#46; The variants reported to date include splice site mutations&#44; large multi-exon deletions&#44; protein-truncating variants&#44; and nonsense mutations&#46;</p></span><span id="s0190" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0210"><span class="elsevierStyleItalic">DNAJC6</span> parkinsonism phenotype</span><p id="p0245" class="elsevierStylePara elsevierViewall">These patients develop parkinsonism at an early age &#40;10&#8211;42&#8239;years&#41;&#44;<a class="elsevierStyleCrossRef" href="#bb0150"><span class="elsevierStyleSup">30</span></a> presenting rapid progression associated with resting and postural tremor&#46;<a class="elsevierStyleCrossRef" href="#bb0250"><span class="elsevierStyleSup">50</span></a> Some respond well to levodopa&#44; but present motor and psychiatric adverse effects&#46; Patients eventually present ataxia and postural instability&#44; reaching a stage where they need a wheelchair or are unable to leave bed&#44; with anarthria and global akinesia at 10&#8211;15&#8239;years of progression&#46;<a class="elsevierStyleCrossRef" href="#bb0250"><span class="elsevierStyleSup">50</span></a> Some patients present generalised or intermittent dystonia&#46;<a class="elsevierStyleCrossRef" href="#bb0190"><span class="elsevierStyleSup">38</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0250"><span class="elsevierStyleSup">50</span></a> Carriers of the D331Y variant present PD&#44; although tremor is less frequent&#46;<a class="elsevierStyleCrossRef" href="#bb0190"><span class="elsevierStyleSup">38</span></a> Reported symptoms include intellectual disability&#44; pyramidal signs&#44; severe dysarthria&#44; and epilepsy&#46;<a class="elsevierStyleCrossRef" href="#bb0250"><span class="elsevierStyleSup">50</span></a> The D331Y and M358I variants are associated with autonomic dysfunction&#46;<a class="elsevierStyleCrossRef" href="#bb0190"><span class="elsevierStyleSup">38</span></a></p></span></span><span id="s0195" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0215">VPS13C</span><span id="s0200" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0220">Function of the VPS13C protein</span><p id="p0250" class="elsevierStylePara elsevierViewall">VPS13C belongs to a family of large VPS13 proteins &#40;VPS13A&#8211;D&#41;&#44; which are essential in vesicular transport&#46; Early studies linked VPS13 with delivery of proteins to the lysosome&#46; It has been suggested that the protein may also play a role in PINK1&#47;parkin transport&#44; delivering damaged mitochondrial cargo directly to lysosomes in response to mitochondrial stress&#46; Several other reports suggest that&#44; like <span class="elsevierStyleItalic">PINK1</span> and <span class="elsevierStyleItalic">PRKN</span>&#44; <span class="elsevierStyleItalic">VPS13C</span> is involved in mitochondrial maintenance&#46;<a class="elsevierStyleCrossRef" href="#bb0255"><span class="elsevierStyleSup">51</span></a></p></span><span id="s0205" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0225">Molecular mechanisms associated with <span class="elsevierStyleItalic">VPS13C</span> and Parkinson&#39;s disease</span><p id="p0255" class="elsevierStylePara elsevierViewall">Loss of function of VPS13C would cause perinuclear redistribution of mitochondria&#44; mitochondrial fragmentation&#44; and a reduction in mitochondrial transmembrane potential&#44; increasing mitophagy in response to mitochondrial damage&#44; mediated by PINK1&#47;parkin&#46;</p></span><span id="s0210" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0230"><span class="elsevierStyleItalic">VPS13C</span> variants</span><p id="p0260" class="elsevierStylePara elsevierViewall">Nonsense variants&#44; splice site mutations&#44; and structural variations have been reported in 6 individuals from France and Turkey&#46;<a class="elsevierStyleCrossRef" href="#bb0260"><span class="elsevierStyleSup">52</span></a> Such polymorphisms as rs2414739 may act as genetic risk factors for PD&#46;<a class="elsevierStyleCrossRef" href="#bb0265"><span class="elsevierStyleSup">53</span></a></p></span><span id="s0215" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0235"><span class="elsevierStyleItalic">VPS13C</span> parkinsonism phenotype</span><p id="p0265" class="elsevierStylePara elsevierViewall">Parkinsonism associated with <span class="elsevierStyleItalic">VPS13C</span> variants manifests early &#40;25&#8211;46&#8239;years of age&#41; and responds to levodopa&#46; However&#44; progression is particularly aggressive&#44; frequently with loss of treatment response&#44;<a class="elsevierStyleCrossRef" href="#bb0150"><span class="elsevierStyleSup">30</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bb0270"><span class="elsevierStyleSup">54</span></a> and some patients present motor fluctuations and dystonia&#46; Limb tremor&#44; axial symptoms&#44; cognitive impairment&#44; dysautonomia&#44; pyramidal signs&#44; and weakness are reported in 2&#47;3 patients&#46; The majority of patients are unable to leave bed by 15&#8239;years after symptom onset&#46;<a class="elsevierStyleCrossRef" href="#bb0270"><span class="elsevierStyleSup">54</span></a></p></span></span></span></span><span id="s0220" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st0240">Conclusions</span><p id="p0270" class="elsevierStylePara elsevierViewall">The causal genes involved in recessive forms of parkinsonism participate in various pathways and cell processes fundamental to PD pathophysiology&#46; Specifically&#44; pathogenic <span class="elsevierStyleItalic">PRKN</span> and <span class="elsevierStyleItalic">PINK1</span> variants are associated with dysfunctional mitophagy&#46; Such other genes as <span class="elsevierStyleItalic">DJ-1</span>&#44; <span class="elsevierStyleItalic">PLA2G6</span>&#44; <span class="elsevierStyleItalic">VPS13C</span>&#44; and <span class="elsevierStyleItalic">ATP13A2</span> are related to mitochondrial homeostasis&#46; Others&#44; such as <span class="elsevierStyleItalic">DNAJC6</span>&#44; are involved in vesicle trafficking&#44; and especially endocytosis&#46; From a clinical perspective&#44; patients with <span class="elsevierStyleItalic">PRKN</span>-PD present a classical early-onset phenotype&#44; as do those with <span class="elsevierStyleItalic">PINK1</span>-PD and <span class="elsevierStyleItalic">DJ-1</span>&#8211;PD&#44; who rarely present atypical symptoms&#46; On the other hand&#44; the remaining genetic forms addressed in this review manifest with complex phenotypes and atypical characteristics including pyramidal signs&#44; dystonia &#40;constituting the so-called pallido-pyramidal syndrome&#41;&#44; ataxia&#44; myoclonus&#44; oculomotor alterations&#44; epilepsy&#44; and psychiatric disorders&#46; Establishing phenotype&#8211;genotype relationships and identifying the molecular pathways involved in autosomal recessive PD constitute the groundwork for advancing towards precision medicine&#46;</p></span><span id="s6075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st6135">Data protection</span><p id="p6340" class="elsevierStylePara elsevierViewall">The authors declare that no patient data appear in this article&#46;</p></span><span id="s6080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="st6140">Funding</span><p id="p6345" class="elsevierStylePara elsevierViewall">This study has received no specific funding from any public&#44; commercial&#44; or non-profit organisation&#46;</p></span></span>"
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          "titulo" => "Introduction"
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          "titulo" => "Review"
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              "identificador" => "s0015"
              "titulo" => "Genes associated with autosomal recessive early-onset Parkinson&#39;s disease with typical manifestations"
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                  "identificador" => "s0020"
                  "titulo" => "PRKN"
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                      "titulo" => "PRKN molecular mechanisms associated with Parkinson&#39;s disease"
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                  "titulo" => "PINK1"
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                      "titulo" => "Function of the PINK1 protein and molecular mechanisms associated with Parkinson&#39;s disease"
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                      "titulo" => "PINK1 variants"
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              "titulo" => "Genes associated with autosomal recessive Parkinson&#39;s disease with atypical phenotypes"
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                      "titulo" => "ATP13A2-PD phenotype"
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                  "titulo" => "Neurodegeneration with brain iron accumulation&#47;hereditary dystonia&#47;PLA2G6-PD"
                  "secciones" => array:4 [
                    0 => array:2 [
                      "identificador" => "s0125"
                      "titulo" => "Function of the phospholipase A2 group VI protein"
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                      "titulo" => "Molecular mechanisms associated with Parkinson&#39;s disease"
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                      "titulo" => "PLA2G6 variants"
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                      "titulo" => "PLA2G6 parkinsonism phenotype"
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                  "titulo" => "FBXO7"
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                      "titulo" => "Molecular mechanisms associated with FBXO7 and Parkinson&#39;s disease"
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                      "titulo" => "FBXO7 variants"
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                      "titulo" => "FBXO7 parkinsonism phenotype"
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                      "titulo" => "Molecular mechanisms associated with DNAJC6 and Parkinson&#39;s disease"
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                      "titulo" => "DNAJC6 variants"
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                      "titulo" => "DNAJC6 parkinsonism phenotype"
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                  "titulo" => "VPS13C"
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                      "titulo" => "Molecular mechanisms associated with VPS13C and Parkinson&#39;s disease"
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                      "titulo" => "VPS13C variants"
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                      "titulo" => "VPS13C parkinsonism phenotype"
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    "fechaRecibido" => "2022-09-23"
    "fechaAceptado" => "2023-08-01"
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            0 => "Parkinson&#39;s disease"
            1 => "Genetics"
            2 => "<span class="elsevierStyleItalic">PRKN</span>"
            3 => "<span class="elsevierStyleItalic">PINK1</span>"
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            0 => "Enfermedad de Parkinson"
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        "titulo" => "Abstract"
        "resumen" => "<span id="as0005" class="elsevierStyleSection elsevierViewall"><p id="sp0020" class="elsevierStyleSimplePara elsevierViewall">The genes associated with autosomal recessive Parkinson&#39;s disease &#40;PD&#41; include the <span class="elsevierStyleItalic">PRKN</span>&#44; <span class="elsevierStyleItalic">PINK1</span>&#44; and <span class="elsevierStyleItalic">DJ-1</span> genes&#46; Homozygous and compound heterozygous carriers of pathogenic variants of these genes tend to display typical characteristics of PD at early ages&#46;</p><p id="sp0025" class="elsevierStyleSimplePara elsevierViewall">On the other hand&#44; the <span class="elsevierStyleItalic">ATP13A2</span>&#44; <span class="elsevierStyleItalic">FBXO7</span>&#44; <span class="elsevierStyleItalic">PLA2G6</span>&#44; <span class="elsevierStyleItalic">SYNJ1</span>&#44; and <span class="elsevierStyleItalic">DNAJC6</span> genes are associated with early-onset recessive forms that frequently present with pyramidal signs&#44; ataxia&#44; and oculomotor alterations&#44; with early appearance of levodopa-induced motor fluctuations and dyskinesia&#46; Such non-motor symptoms as depression&#44; psychiatric disorders&#44; hallucinations&#44; and epilepsy are also more frequent in this group&#46;</p><p id="sp0030" class="elsevierStyleSimplePara elsevierViewall">Among multiple molecular mechanisms involved in these cases&#44; key examples are the dysfunction of mitochondrial and lysosomal processes&#46;</p><p id="sp0035" class="elsevierStyleSimplePara elsevierViewall">This article presents a brief review intended to inform clinicians about the basic molecular mechanisms and phenotype&#8211;genotype relationship of these monogenic forms of PD&#46;</p></span>"
      ]
      "es" => array:2 [
        "titulo" => "Resumen"
        "resumen" => "<span id="as0010" class="elsevierStyleSection elsevierViewall"><p id="sp0040" class="elsevierStyleSimplePara elsevierViewall">Los genes asociados a enfermedad de Parkinson &#40;EP&#41; de herencia mendeliana autos&#243;mica recesiva incluyen PRKN&#44; PINK1 y DJ-1&#46; Los individuos portadores homocigotos o heterocigotos compuestos de variantes patog&#233;nicas en estos genes tienden a manifestar caracter&#237;sticas t&#237;picas de la enfermedad de EP a edad temprana&#46;</p><p id="sp0045" class="elsevierStyleSimplePara elsevierViewall">Por otro lado&#44; los genes ATP13A2&#44; FBXO7&#44; PLA2G6&#44; SYNJ1&#44; y DNAJC6&#44; se asocian a formas recesivas de manifestaci&#243;n precoz&#44; presentan con frecuencia signos piramidales&#44; ataxia y alteraciones oculomotoras&#44; y desarrollan tempranamente&#44; fluctuaciones motoras y disquinesias inducidas por levodopa&#46; Alteraciones no motoras como depresi&#243;n&#44; alteraciones psiqui&#225;tricas&#44; alucinaciones y epilepsia son tambi&#233;n m&#225;s frecuentes en este grupo&#46;</p><p id="sp0050" class="elsevierStyleSimplePara elsevierViewall">Entre los m&#250;ltiples aspectos moleculares comprometidos en estos casos&#44; destacan la disfunci&#243;n de procesos mitocondriales y lisosomales&#46;</p><p id="sp0055" class="elsevierStyleSimplePara elsevierViewall">En este art&#237;culo presentamos una breve revisi&#243;n orientada al cl&#237;nico sobre los aspectos moleculares b&#225;sicos y relaci&#243;n fenotipo-genotipo de estas formas monog&#233;nicas de la EP&#46;</p></span>"
      ]
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          0 => array:4 [
            "apendice" => "<p id="p0280" class="elsevierStylePara elsevierViewall"><elsevierMultimedia ident="ec0005"></elsevierMultimedia></p>"
            "etiqueta" => "Appendix A"
            "titulo" => "Supplementary data"
            "identificador" => "s0225"
          ]
        ]
      ]
    ]
    "multimedia" => array:2 [
      0 => array:8 [
        "identificador" => "t0005"
        "etiqueta" => "Table 1"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "detalles" => array:1 [
          0 => array:3 [
            "identificador" => "al0005"
            "detalle" => "Table "
            "rol" => "short"
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        "tabla" => array:2 [
          "leyenda" => "<p id="sp0010" class="elsevierStyleSimplePara elsevierViewall">&#43;&#58; expected in this disease&#46; BIA&#58; brain iron accumulation&#59; FFF&#58; facial&#8211;faucial&#8211;finger&#59; LL&#58; lower limbs&#59; OA&#58; oculomotor apraxia&#59; OC&#58; oculogyric crises&#59; SP&#58; spastic paraparesis&#59; TEV&#58; talipes equinovarus&#59; VGP&#58; vertical gaze palsy&#46;</p><p id="sp0015" class="elsevierStyleSimplePara elsevierViewall">&#42;&#42;&#42; This table is based on the authors&#39; interpretation of the literature&#46;</p>"
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            0 => array:2 [
              "tabla" => array:1 [
                0 => """
                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Gene&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">PRKN</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">PINK1</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">DJ-1</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">ATP13A2</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">PLA2G6</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">FBXO7</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">DNAJC6</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black"><span class="elsevierStyleItalic">VPS13C</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Locus&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">PARK2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">PARK6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">PARK7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">PARK9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">PARK14&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">PARK15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Early onset&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Juvenile onset&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Response to levodopa&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&#8764;50&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>At onset&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>At onset&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Motor fluctuations&#47;early dyskinesia&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Early&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Early&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Early&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Early&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Dystonia&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>LL&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>TEV&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Tremor&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Postural instability&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Pyramidal signs&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>SP phenotype&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Neuropathy&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Ataxia&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Myoclonus&#47;mini-myoclonus&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>FFF mini-myoclonus&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Oculomotor alterations&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>VGP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>OC&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>OA&#44; VGP&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Epilepsy&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Early-onset dementia&#47;intellectual disability&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Severe neuropsychiatric disorders&#47;early-onset psychosis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Psychosis&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Psychosis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Autonomic dysfunction&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Early&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Early&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">Early dysarthria&#47;dysphagia&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">&#43;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Anarthria&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Atrophy&#44; BIA&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&#43;<span class="elsevierStyleHsp" style=""></span>Cerebellar atrophy&#44; BIA&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                            2 => "N&#46; Hattori"
                            3 => "H&#46; Matsumine"
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ISSN: 26670496
Original language: English
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