Scientific letter
Werner syndrome as a crossroads between lipodystrophy, escleroderma-like changes and torpid ulcers in lower limbs
Síndrome de Werner como encrucijada entre lipodistrofia, cambios esclerodérmicos y úlceras tórpidas en miembros inferiores
Juan de Dios García Díaza,b,
, Sandra Coronado Fernándezb, Sara Jiménezc, José Antonio Rubioc, Cristina Bohórquez Herasd
Corresponding author
a Unidad de Genética Clínica y Lípidos, Hospital Universitario Príncipe de Asturias, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
b Servicio de Medicina Interna, Hospital Universitario Príncipe de Asturias, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
c Unidad de Pie Diabético, Servicio de Endocrinología y Nutrición, Hospital Universitario Príncipe de Asturias, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
d Servicio de Reumatología, Hospital Universitario Príncipe de Asturias, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
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Hospital Universitario Príncipe de Asturias. Universidad de Alcalá.</p><p id="par0010" class="elsevierStylePara elsevierViewall">Campus Universitario. Ctra. Alcalá-Meco, s/n. 28805 Alcalá de Henares, Madrid, España.</p><p id="par0015" class="elsevierStylePara elsevierViewall">Werner's syndrome (WS) or adult progeria is an autosomal recessive hereditary disorder with premature ageing beginning in the person's teens. Its incidence is less than 1/10<span class="elsevierStyleSup">6</span> births, although it is probably underdiagnosed.<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> Although it was originally described in 1904, its molecular basis was not established until 1996.<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> It is caused by mutations in the <span class="elsevierStyleItalic">WRN</span> or <span class="elsevierStyleItalic">RECQL2</span> gene, which encodes a DNA helicase. This enzyme is key in DNA repair processes and in maintaining telomere integrity, so a deficiency causes genomic instability, risk of cancer and cellular senescence.<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> The main clinical manifestations are the absence of a puberty growth spurt with short stature, thinning hair with early greying, skin changes, sarcopenia, osteoporosis and glucose and lipid metabolism abnormalities with accelerated atheromatosis.<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> Biallelic mutations in the <span class="elsevierStyleItalic">WRN</span> gene are found in 97% of patients. Clinically diagnosed cases in which no <span class="elsevierStyleItalic">WRN</span> mutations are found are called atypical WS and in a significant proportion of these, mutations in the <span class="elsevierStyleItalic">LMNA</span> gene are identified, with earlier symptoms and more rapid progression.<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">We present a case of WS diagnosed after association and exclusion of signs and symptoms and the use of next-generation genetic sequencing techniques.</p><p id="par0025" class="elsevierStylePara elsevierViewall">This was a 55-year-old woman who consulted with painful ulcers on both feet. She had never smoked and had been diagnosed with type 2 diabetes mellitus at the age of 29 years, requiring insulin and pioglitazone early, which provided adequate control (HbA1c around 7%). She had surgery for bilateral cataracts at age 50. The patient's height was 147 cm, weight 46 kg, and she had increased abdominal adiposity (circumference 94 cm) with a marked decrease in the fat panniculus around the edges. Her scalp hair was sparse and she had started to go grey in her 20 s. The skin on her hands and feet was thick and hard, with thinning of the underlying tissues, leading to suspicion of scleroderma. She did not have Raynaud's phenomenon and nailfold capillaroscopy showed isolated dilations and capillary ramifications. She had developed the ulcers five years earlier, preceded by hyperkeratosis, which were now chronic, with poor healing and frequent superinfection. The deepest ulcers were located both in the balls and backs of the first and second toes of both feet, some of them deep with bone exposure; ulcers had also developed on the metatarsal heads of the first and fifth toes and on the lateral aspects of her feet. She also had <span class="elsevierStyleItalic">hallux valgus</span> and claw toes. Sensitivity in her lower limbs and distal peripheral pulses were normal, with an indeterminate ankle-brachial index due to arterial stiffness. Transcutaneous oxygen pressures (TcPO2) in her feet were 8 and 2 mmHg. Her total cholesterol was 227 mg/dl and triglycerides 289 mg/dl. X-rays of her hands and feet detected osteoporosis and vascular and subcutaneous calcifications, and liver ultrasound revealed steatosis. Further investigations ruled out involvement of the gastrointestinal tract, heart, lungs or kidneys, and autoimmunity tests were negative. There were also no signs of diabetic nephropathy or retinopathy. Added to the intensive treatment of the ulcers (frequent dressings, discharge measures and antibiotics), the patient was started on treatment with bosentan (125 mg/12 h), but with no significant improvement. The associated pain and the need for functional rest had made the use of a wheelchair necessary.</p><p id="par0030" class="elsevierStylePara elsevierViewall">The molecular study with next-generation sequencing of 27 genes associated with hereditary lipodystrophies identified a rare homozygous variant (c.3711del or p.K1237Nfs*11) in the <span class="elsevierStyleItalic">WRN</span> gene, classified as pathogenic in ClinVar (ID: 577673). None of the patient's children or siblings and neither of her parents had developed similar conditions. There was no known consanguinity between the parents, although their families were originally from the same town in the province of Ciudad Real.</p><p id="par0035" class="elsevierStylePara elsevierViewall">Although Spain has had some reports of cases of patients with suspected WS, most are old and prior to the discovery of the causative gene. This is the first case in this country with a full clinical description and molecular confirmation. The mutation found in the <span class="elsevierStyleItalic">WRN</span> gene, although described as pathogenic, is very uncommon worldwide.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> In addition, finding it as a homozygous variant has revealed the existence of some previously unknown degree of consanguinity in her parents.</p><p id="par0040" class="elsevierStylePara elsevierViewall">Despite the patient meeting the criteria for typical WS (<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>), the delay of more than 25 years from onset of the syndrome to it being recognised is remarkable. One of the aspects that most pointed to the diagnosis was her general physical appearance, with regional lipodystrophy (severe lipoatrophy of the extremities and truncal obesity). About twenty progeroid syndromes with different molecular mechanisms are known; along with premature ageing, they are associated with different patterns of lipodystrophy<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> and ectopic fat deposition, which can lead to the development of insulin resistance, type 2 diabetes, fatty liver and atherogenic dyslipidaemia.<a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6,7</span></a> Our patient had this metabolic constellation, although her blood glucose control was adequate and she had no signs of diabetic microangiopathy. In addition to the elevated risk of malignancy, these metabolic complications contribute to the premature death of patients with WS due to accelerated atheromatosis.</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0045" class="elsevierStylePara elsevierViewall">The signs of scleroderma were also striking. Unlike scleroderma, however, she did not have Raynaud's phenomenon, the capillaroscopy pattern was atypical, the autoantibody screening was negative and there was no evidence of internal organ involvement. The distribution of the scleroderma was also very characteristic of WS. Nevertheless, the differential diagnosis with systemic sclerosis can be difficult.<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">However, the main associated disorder is chronic ulcers, severely limiting the patient's quality of life and functional autonomy. The pathogenesis of these ulcers is more complex and multifactorial than that of the simple diabetic foot ulcer.<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> In addition to vascular mechanisms or neuropathy, which were not decisive in our case, gene transcription dysfunction and cellular senescence hinder tissue repair. One extensive review on ulcers in WS patients noted their frequency (more than 40%), calluses as a prodrome, their refractory nature and the frequent need for surgical procedures.<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">In conclusion, the manifestations of WS are multisystemic and nonspecific, which delays correct diagnosis and management. However, understanding WS alerts us to suspect the diagnosis and order the confirmatory molecular tests. Despite the lack of a specific treatment, identification is essential for appropriate follow-up and genetic counselling.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Ethical responsibilities</span><p id="par0060" class="elsevierStylePara elsevierViewall">The patient gave her written informed consent, both for the molecular study and for taking clinical images. The Independent Ethics Committee raised no objections to this publication.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:2 [ 0 => array:2 [ "identificador" => "sec0005" "titulo" => "Ethical responsibilities" ] 1 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "multimedia" => array:1 [ 0 => array:9 [ "identificador" => "tbl0005" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "fuente" => "Source: Tsuge et al.<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a>" "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Table " "rol" => "short" ] ] "tabla" => array:3 [ "leyenda" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Definite diagnosis: all the cardinal signs and two further signs.</p><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Probable diagnosis: the first three cardinal signs and any two further signs.</p><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Possible diagnosis: cataracts or dermatological signs and any four further signs.</p><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Exclusion: onset of signs and symptoms before adolescence (except short stature).</p>" "tablatextoimagen" => array:1 [ 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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black"> \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Met by our patient<a class="elsevierStyleCrossRef" href="#tblfn0005"><span class="elsevierStyleSup">a</span></a> \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-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " colspan="2" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">I. Cardinal signs and symptoms (onset over 10 years old):</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>1. Cataracts (bilateral) \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>2. Characteristic dermatological pathology (hard, tight skin, atrophic skin, pigmentary alterations, ulceration, hyperkeratosis, regional subcutaneous atrophy) and characteristic facies ('bird' facies) \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>3. Short stature \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>4. Parental consanguinity or affected sibling \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">? \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>5. Premature greying and/or thinning of scalp hair \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " colspan="2" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">II. Other signs and symptoms:</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>1. Diabetes mellitus \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>2. Hypogonadism (secondary sexual underdevelopment, diminished fertility, testicular or ovarian atrophy) \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">? \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>3. Osteoporosis \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>4. Osteosclerosis of the distal phalanges \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">– \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>5. Soft tissue calcifications \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>6. Evidence of premature atherosclerosis (e.g., myocardial infarction) \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">– \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>7. Mesenchymal neoplasms, rare neoplasms or multiple neoplasms \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">– \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>8. Voice changes (high-pitched, squeaky or hoarse voice) \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">+ \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>9. Flat feet \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="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">– \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] "imagenFichero" => array:1 [ 0 => "xTab3182889.png" ] ] ] "notaPie" => array:1 [ 0 => array:3 [ "identificador" => "tblfn0005" "etiqueta" => "a" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">(+): yes; (-): no; (?): not sure.</p>" ] ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Diagnostic criteria of the International Registry of Werner's Syndrome.</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:10 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Recent Advances in Understanding Werner Syndrome" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:4 [ 0 => "R.A. 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Nakagami" ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1111/ggi.14096" "Revista" => array:6 [ "tituloSerie" => "Geriatr Gerontol Int" "fecha" => "2021" "volumen" => "21" "paginaInicial" => "153" "paginaFinal" => "159" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/33225552" "web" => "Medline" ] ] ] ] ] ] ] ] ] ] ] ] ] "idiomaDefecto" => "en" "url" => "/25300180/0000007000000005/v1_202305311257/S2530018023000823/v1_202305311257/en/main.assets" "Apartado" => array:4 [ "identificador" => "64494" "tipo" => "SECCION" "en" => array:2 [ "titulo" => "Scientific letters" "idiomaDefecto" => true ] "idiomaDefecto" => "en" ] "PDF" => "https://static.elsevier.es/multimedia/25300180/0000007000000005/v1_202305311257/S2530018023000823/v1_202305311257/en/main.pdf?idApp=UINPBA00004N&text.app=https://www.elsevier.es/" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S2530018023000823?idApp=UINPBA00004N" ]
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