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CASE REPORT
Novel compound aquaporin 2 mutations in nephrogenic diabetes insipidus
Raphael D. Liberatore JuniorI, Juliana G. CarneiroII, Franciele B. LeidenzII, Rachel Melilo-CarolinoII, Helena C. SarubiII, Luiz De MarcoII,
Corresponding author
ldemarco@ufmg.br

Tel.: 55 31 3409-9134
I Faculdade de Medicina de São José do Rio Preto, Department of Pediatrics, São José do Rio /SP, Brazil.
II Universidade Federal de Minas Gerais, Faculdade de Medicina, Department of Surgery, Belo Horizonte/MG, Brazil.
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          "en" => "<p id="spara10" class="elsevierStyleSimplePara elsevierViewall">&#40;a&#41; Pedigree of the Brazilian family with NDI&#59; the proband is indicated by an arrow&#46; An open square with an inset &#40;N&#41; indicates that the individual was unaffected&#46; &#40;b&#41; c&#46;491T&#62;C polymorphism&#59; &#40;c and e&#41; heterozygosis at c&#46;601C&#62;T &#40;H201Y&#41; of the proband and her mother&#59; and &#40;d and f&#41; heterozygosis at c&#46;697C&#62;G &#40;G211R&#41; of the proband and her father&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="cesec10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle10">INTRODUCTION</span><p id="para10" class="elsevierStylePara elsevierViewall">Nephrogenic diabetes insipidus &#40;NDI&#41; is a rare disease that is characterized by the excretion of abnormally large volumes of urine&#44; due to the inability of the kidneys to concentrate urine in response to arginine vasopressin &#40;AVP&#41;&#46; Classical NDI symptoms include polydipsia and polyuria in infants during the first year of life&#46; Acquired NDI is the most common form of this disease in adults&#46; The majority of inherited cases are caused by mutations in the arginine vasopressin V2 receptor &#40;<span class="elsevierStyleItalic">AVPR2&#41;</span> gene &#40;MIM&#35; 300538&#41; on chromosome Xq28&#44; which leads to functional defects in the AVPR2&#46; The aquaporin &#40;<span class="elsevierStyleItalic">AQP2&#41;</span> gene &#40;MIM&#35; 107777&#41; on chromosome 12q13 &#40;<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#41; is associated with the disease &#40;<a class="elsevierStyleCrossRef" href="#bib2">2</a>&#44;<a class="elsevierStyleCrossRef" href="#bib3">3</a>&#41; in the minority of cases &#40;&#8764;10&#37;&#41;&#46; The present study identified two novel compound heterozygous mutations in the <span class="elsevierStyleItalic">AQP2</span> gene&#44; H201Y and G211R&#44; in one female patient with congenital NDI&#46;</p></span><span id="cesec20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle20">CASE REPORT</span><p id="para20" class="elsevierStylePara elsevierViewall">A breastfeeding two-month-old girl was admitted to the emergency room after 12 days of fever of unknown origin and weight loss&#46; The patient had received 20 &#956;g of 1-desamino&#91;8-D-arginine&#93;vasopressin &#40;dDAVP&#41; intranasally&#44; but this intervention did not decrease her urine output&#46; Physical examination revealed a severely dehydrated and highly irritable infant with no other clinical abnormalities&#46; The infant&#39;s height-for-age ratio was in the 3<span class="elsevierStyleSup">rd</span> percentile&#44; and her initial laboratory profile revealed hypernatremia &#40;172 mEq&#47;ml&#41; and a low urine density &#40;1&#46;005&#41;&#46; The patient&#39;s basal sodium was within the normal range after an increase in her fluid intake and a low sodium diet&#44; and she was subjected to laboratory investigation to ascertain the diagnosis of NDI according to established criteria &#40;<a class="elsevierStyleCrossRef" href="#bib4">4</a>&#41;&#46; A short water deprivation test was performed under a strictly controlled medical setting&#44; but this test was stopped six hours later because of weight loss &#40;3&#37;&#41;&#46; Her urinary osmolality was 263 mOsmol&#47;kg at six hours and increased to 300 mOsmol&#47;kg one hour after dDAVP administration &#40;20 &#956;g intranasally&#41;&#46; The patient was allowed water after the administration of dDAVP&#46; The T1-weighted images from a brain MRI did not reveal the hyperintense signal that is normally emitted by the posterior pituitary gland &#40;i&#46;e&#46;&#44; there was no &#8220;bright spot&#8221;&#41;&#46; The child&#39;s parents were also subjected to diagnostic procedures to exclude nephrogenic diabetes insipidus&#46; The patient was the second child of a healthy young and non-consanguineous couple with no diabetes insipidus symptoms&#46; The patient was a postfertilization baby for whom the female sex had been chosen&#44; and her older brother had hemophilia&#46; The family pedigree is shown in <a class="elsevierStyleCrossRef" href="#fig1">Figure 1a</a>&#46; Hydrochlorothiazide &#40;5 mg&#47;kg&#47;twice daily&#41; and amiloride &#40;20 mg&#47;m<span class="elsevierStyleSup">2</span>&#47;day&#41; were initiated&#44; but only a partial response was observed&#59; namely&#44; the patient&#39;s basal urine osmolality increased to 456 mOsmol&#47;kg two weeks after the initiation of these two medications&#46; A remission of symptoms occurred when indomethacin &#40;1&#46;0 mg&#47;kg&#47;day&#41; was subsequently added&#46; Two weeks after initial administration of this medication&#44; the patient&#39;s urine osmolality rose to 587 mOsmol&#47;kg&#46; The patient&#39;s height-for-age ratio was in the 50<span class="elsevierStyleSup">th</span> percentile at age four&#44; while she was under careful surveillance and receiving medications&#46;</p><elsevierMultimedia ident="fig1"></elsevierMultimedia><p id="para30" class="elsevierStylePara elsevierViewall">The parents signed an informed consent that was approved by the Institutional Ethics Committee in accordance with the ethical standards of the 1964 Declaration of Helsinki&#46;</p></span><span id="cesec30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle30">MATERIALS AND METHODS</span><p id="para40" class="elsevierStylePara elsevierViewall">Whole blood cells were collected from the patient and her parents for molecular analyses&#46; Genomic DNA was isolated using the Wizard Genome DNA Purification Kit&#174; &#40;Promega&#44; Madison&#44; WI&#41; according to the manufacturer&#39;s instructions&#46; All coding and flanking regions of all exons of the <span class="elsevierStyleItalic">AVPR2</span> gene were amplified by PCR using previously described sets of primers &#40;<a class="elsevierStyleCrossRef" href="#bib5">5</a>&#41;&#46; The <span class="elsevierStyleItalic">AQP2</span> gene oligonucleotides included the following sequences&#58; exon 1&#44; forward CATCCTGGCCCTGAGACA&#44; reverse TACAAGGGATTCCCCAGGAC&#59; exon 2&#44; forward GACAGGAAGATGGAGCCAGA&#44; reverse TGGAGTGGTCTGTGTGTCTGT&#59; exon 3&#44; forward ACAAGGACTTCCTGCCCTGT&#44; reverse TCCCATGCTATTCCAGCTCT&#59; and exon 4&#44; forward TAATGTCGGGGAGGAGAGGT&#44; reverse CACGTCCAGGAAGCAGCTA&#46; Briefly&#44; PCR was performed in a final volume of 25 &#956;l containing IIB Buffer 10x&#44; 0&#46;2 mM dNTP&#44; 10 pmol of each primer&#44; 0&#46;625 U <span class="elsevierStyleItalic">Taq polymerase</span> and 60 ng&#47;&#956;l DNA&#46; PCR products were purified using the GFX PCR DNA and Gel Purification Kit &#40;Amersham Pharmacia Biotech&#44; Piscataway&#44; NJ&#41; according to the manufacturer&#39;s instructions and sequenced in an ABI Prism&#174; 3130 Genetic Analyzer using the ABI Prism Dye Terminator sequencing kit &#40;Applied Biosystems&#44; Foster City&#44; CA&#41; according to the standard protocol&#46; Sequences were performed in the sense and antisense directions in duplicate using separate DNA extractions&#46;</p></span><span id="cesec40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle40">RESULTS</span><p id="para50" class="elsevierStylePara elsevierViewall">A diagnosis of NDI due to mutations of the <span class="elsevierStyleItalic">AVPR2</span> gene was excluded based on the patient&#39;s sex&#44; although certain female carriers have a partial response to dDAVP due to skewed X-chromosome inactivation &#40;<a class="elsevierStyleCrossRef" href="#bib6">6</a>&#41;&#44; and also based on the direct sequencing of the entire coding and exon-flanking gene regions&#44; which demonstrated a wild-type sequence&#46; Sequencing analyses of all four <span class="elsevierStyleItalic">AQP2</span> exons revealed that the patient was a compound heterozygote with two novel point mutations in exons 3 and 4&#46; One point mutation was a C-to-T transversion at position 601 &#40;c&#46;601C&#62;T&#41; in exon 3 &#40;H201Y&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig1">Figure 1c</a>&#41;&#44; which was inherited from her mother &#40;<a class="elsevierStyleCrossRef" href="#fig1">Figure 1e</a>&#41;&#44; and a C to G transition at position 697 &#40;c&#46;697C&#62;G&#41; in exon 4 &#40;G211R&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig1">Figure 1d</a>&#41;&#44; which was inherited from her father &#40;<a class="elsevierStyleCrossRef" href="#fig1">Figure 1f</a>&#41;&#46; A previously described polymorphism at position 491 &#40;c&#46;491T&#62;C&#59; S167S&#41; was also present &#40;<a class="elsevierStyleCrossRef" href="#fig1">Figure 1b</a>&#41;&#46; Neither parent exhibited any clinical or biochemical signs of diabetes insipidus&#46;</p></span><span id="cesec50" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle50">DISCUSSION</span><p id="para60" class="elsevierStylePara elsevierViewall">This report described two novel missense mutations in a heterozygote female infant with inherited NDI&#46; Severe polyuria and polydipsia began soon after birth&#44; and these findings in association with the child&#39;s sex and the failure of dDAVP to relieve symptoms suggested that NDI was caused by mutation&#40;s&#41; of the <span class="elsevierStyleItalic">AQP2</span> gene&#46; A full mutation analysis of the AVP receptor gene demonstrated no germline mutations&#46; NDI that is caused by mutations in the <span class="elsevierStyleItalic">AQP2</span> gene are inherited as either an autosomal recessive or a dominant trait &#40;<a class="elsevierStyleCrossRef" href="#bib7">7</a>&#44;<a class="elsevierStyleCrossRef" href="#bib8">8</a>&#41;&#46; The sequencing analyses of the <span class="elsevierStyleItalic">AQP2</span> gene in our patient revealed a compound heterozygosity that was inherited from both parents&#46; Heterozygote mutation carriers are not affected&#46; Therefore&#44; no clinically important phenotype was expected or observed in the patient&#39;s parents&#46; Interestingly&#44; the patient&#39;s height-for-age ratio at age four was within the normal range&#46; Patients with mutations in the <span class="elsevierStyleItalic">AQP2</span> gene have a short &#40;<a class="elsevierStyleCrossRef" href="#bib9">9</a>&#41; or normal stature &#40;<a class="elsevierStyleCrossRef" href="#bib10">10</a>&#44;<a class="elsevierStyleCrossRef" href="#bib11">11</a>&#41;&#46; The response to therapy in this child was notably better than the response of other patients with autosomal-recessive NDI due to <span class="elsevierStyleItalic">AQP2</span> gene mutations&#46; The reasons for this improved response are not known&#44; but the presence of a compound heterozygote mutation may underlie this unusually good response&#46;</p><p id="para70" class="elsevierStylePara elsevierViewall">The human <span class="elsevierStyleItalic">AQP2</span> gene is located on chromosome 12q13&#46; This gene has four exons and three introns&#44; and it is predicted to code a 271-amino-acid protein&#46; AQP2 is a single polypeptide chain with six transmembrane domains&#44; which is similar to other aquaporins&#44; and both terminal ends are located inside the cell &#40;<a class="elsevierStyleCrossRef" href="#bib3">3</a>&#41;&#46; The first intracellular and the third extracellular loops contain the asparagine-proline-alanine &#40;NPA&#41; motif that is conserved in all members of the membrane integral protein &#40;MIP&#41; family&#46; This motif may play a role in the formation of functional water-selective pores&#44; but it is no longer thought to confer water selectivity &#40;<a class="elsevierStyleCrossRef" href="#bib12">12</a>&#41;&#46; In addition&#44; the phosphorylation of serine at position 256 by PKA in the cytoplasmic COOH-terminus of AQP2 is essential for its distribution from intracellular vesicles to the apical plasma membrane &#40;<a class="elsevierStyleCrossRef" href="#bib13">13</a>&#44;<a class="elsevierStyleCrossRef" href="#bib14">14</a>&#41;&#46;</p><p id="para80" class="elsevierStylePara elsevierViewall">To date&#44; 66 distinct <span class="elsevierStyleItalic">AQP2</span> gene mutations have been described&#44; and the vast majority &#40;86&#37;&#41; of these mutations are associated with an autosomal recessive mode of transmission &#40;MIM &#35;125800&#41;&#46; Several compound mutations within this gene have also been described &#40;<a class="elsevierStyleCrossRef" href="#bib6">6</a>&#44;<a class="elsevierStyleCrossRef" href="#bib9">9</a>&#44;<a class="elsevierStyleCrossRef" href="#bib11">11</a>&#44;<a class="elsevierStyleCrossRefs" href="#bib15">15&#8211;19</a>&#41;&#46; Most mutations in patients with autosomal-recessive NDI are localized between the first and the last transmembrane domains&#46; This segment forms the AQP2 water pore&#44; and the mutation-induced misfolding illustrates the sensitivity of the pore to structural changes &#40;<a class="elsevierStyleCrossRef" href="#bib14">14</a>&#41;&#46; A compound recessive mutation has been described previously in a female patient in which one of the mutations was located in the conserved region of the last transmembrane domain of AQP2&#44; and this mutation resulted in a misfolded protein &#40;<a class="elsevierStyleCrossRef" href="#bib6">6</a>&#41;&#46;</p><p id="para90" class="elsevierStylePara elsevierViewall">The mutations in our analysis&#44; H201Y and G211R&#44; were located on the extracellular and transmembrane domains&#44; respectively&#44; and these domains are probably critical for protein function&#46; Both histidine 201 and glycine 211 are highly conserved amino acids between species&#46; The wild-type glycine&#44; which is the smallest amino acid&#44; is located next to proline&#44; which is responsible for protein folding&#46; The mutations resulting from a substitution of tyrosine &#40;uncharged polar amino acid&#41; for histidine and arginine for glycine severely alter AQP2 structure and disrupt water absorption&#46;</p><p id="para100" class="elsevierStylePara elsevierViewall">In conclusion&#44; this study described a compound heterozygosity that was characterized by two novel mutations in <span class="elsevierStyleItalic">AQP2</span> exons 3 and 4 in an infant female patient&#46; These combined mutations probably caused a disruption in the protein&#44; but functional studies are necessary to understand the effects of these mutations on AQP2&#46;</p></span></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="cenpara10">No potential conflict of interest was reported&#46;</p> <p class="elsevierStyleNotepara" id="cenpara20">Liberator Jr&#46; RD was responsible for thepatient care&#46; Carneiro JG&#44; Leidenz FB&#44; Melilo-Carolino R&#44; Sarubi HC were responsible for the experimental work&#46; De Marco L was responsible for the experimental design and manuscript writing&#46;</p>"
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          "en" => "<p id="spara10" class="elsevierStyleSimplePara elsevierViewall">&#40;a&#41; Pedigree of the Brazilian family with NDI&#59; the proband is indicated by an arrow&#46; An open square with an inset &#40;N&#41; indicates that the individual was unaffected&#46; &#40;b&#41; c&#46;491T&#62;C polymorphism&#59; &#40;c and e&#41; heterozygosis at c&#46;601C&#62;T &#40;H201Y&#41; of the proband and her mother&#59; and &#40;d and f&#41; heterozygosis at c&#46;697C&#62;G &#40;G211R&#41; of the proband and her father&#46;</p>"
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        "texto" => "<p id="para110" class="elsevierStylePara elsevierViewall">We thank the patient and her family for their cooperation&#46; We also thank Dr&#46; Eitan Friedman for helpful comments&#46; This work was funded by grants from the CNPq&#44; FAPEMIG and INCT em Medicina Molecular&#44; Brazil&#46;</p>"
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Article information
ISSN: 18075932
Original language: English
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