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2009 Vienna - European Society of Human Genetics

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Clinical genetics and Dysmorphology<br />

symptoms, speech, language disability and multiple minor anomalies.<br />

P02.105<br />

spondyloepiphyseal dysplasia tarda with progressive<br />

arthropathy (sEDt-PA) in siblings<br />

A. AlKindy1 , S. Morris1 , G. J. Shortland1 , J. te Water Naude, 1 , A. Cowe2 , M.<br />

James-Ellison3 , D. T. Pilz1 ;<br />

1 2 University Hospital Wales, Cardiff, United Kingdom, Singleton Hospital, Swansea,<br />

United Kingdom, 3Morriston Hospital, Swansea, United Kingdom.<br />

Spondyloepiphyseal dysplasia tarda with progressive arthropathy<br />

(SEDT-PA OMIM#208230) also known as Progressive Pseudorheumatoid<br />

Arthropathy <strong>of</strong> Childhood (PPAC) is a very rare autosomal recessive<br />

skeletal dysplasia with an estimated incidence <strong>of</strong> 1per million<br />

in the UK. It is characterised by a postnatal progressive chondropathy<br />

affecting primarily articular cartilage. Clinically, the condition mimics<br />

Juvenile Rheumatoid Arthritis, and the diagnosis is <strong>of</strong>ten significantly<br />

delayed. We want to raise awareness <strong>of</strong> this debilitating condition and<br />

present 2 siblings from a non-consanguineous family with SEDT-PA<br />

diagnosed radiologically. They presented with severe progressive<br />

pain and stiffness <strong>of</strong> the hip joints, waddling gait and rheumatoid- like<br />

hands from 3 years <strong>of</strong> age. Their X-rays showed generalised osteopenia,<br />

platyspondyly, narrow joint spaces, metaphyseal widening and<br />

flattening <strong>of</strong> epiphyses. SEDT-PA was confirmed by identifying compound<br />

heterozygote mutations in the Wnt1-inducible secreted protein<br />

3 (WISP3) gene. The WISP3 protein is a member <strong>of</strong> the CCN family<br />

(cysteine-rich 61, connective tissue growth factor, Nephroblastoma<br />

overexpressed) <strong>of</strong> secreted proteins that specifically associate with extracellular<br />

matrix. CCNs are primarily maintenance proteins that modify<br />

cellular responses to environmental factors and stimuli. Absence <strong>of</strong><br />

WISP3 interferes with normal regulation <strong>of</strong> postnatal skeletal growth<br />

and cartilage homeostasis leading to precocious joint degeneration.<br />

The older sibling is on a trial treatment with Bisphosphonates in view<br />

<strong>of</strong> her marked osteopenia.<br />

P02.106<br />

Gender affects clinical suspicion <strong>of</strong> Down syndrome<br />

N. V. Kovaleva 1,2 ;<br />

1 St. Petersburg State Pediatric Medical Academy, St. Petersburg, Russian<br />

Federation, 2 St. Petersburg Centre for Medical <strong>Genetics</strong>, St. Petersburg, Russian<br />

Federation.<br />

Recent study suggested that low male to female ratio (sex ratio, SR) in<br />

patients with only clinical diagnosis <strong>of</strong> Down syndrome (DS) was due<br />

to a sex bias in clinical diagnosis (Kovaleva NV, AJHG 69,S4:296).<br />

OBJECTIVES: (1) to determine a proportion <strong>of</strong> misdiagnosed cases<br />

among children tested for suspicion <strong>of</strong> trisomy 21, and (2) to study SR<br />

among those not having trisomy 21 according to their age at the genetic<br />

investigation. STUDY POPULATION: children referred to cytogenetic<br />

testing because <strong>of</strong> having clinical features resembling DS, born in<br />

1970-2008. RESULTS: Among 1197 children born in 1986-2008, when<br />

completeness <strong>of</strong> cytogenetic confirmation <strong>of</strong> trisomy 21 had been improving<br />

from 86% to about 100%, there were 96 (8%) with normal<br />

karyotype (annual rate varied from 0% in 1990 to 19% in 2008). Overall,<br />

normal karyotype was diagnosed in 99 newborns (16M/83F, SR=0.19,<br />

p0.05). Thus there was a strong female prevalence in misdiagnosed<br />

newborns decreasing to about population value <strong>of</strong> 1.06 when children<br />

growing up. CONCLUSION: the data obtained suggest that gender<br />

affects clinical suspicion <strong>of</strong> DS. Since characteristic features allowing<br />

suspicion <strong>of</strong> DS include facial dysmorphism, one may hypothesize sex<br />

differences in the normal process <strong>of</strong> facial cranium ontogenesis during<br />

perinatal period. An abnormal condition(s) specific to females might<br />

also be implicated in a proportion <strong>of</strong> the misdiagnosed cases. Data <strong>of</strong><br />

the follow-up study will be presented.<br />

P02.107<br />

A girl with short stature due to SHOX deletion inherited from<br />

paternal Y<br />

J. Dupont, R. Silveira-Santos, A. Medeira, A. Sousa, M. Ávila, S. Serafim, I.<br />

Cordeiro;<br />

Hospital Santa Maria, Lisbon, Portugal.<br />

Short stature is a frequent disorder for which clinical attention is required<br />

during childhood. Short stature homeobox-containing gene<br />

(SHOX) is located on the pseudoautosomal region (PAR1) <strong>of</strong> the short<br />

arm <strong>of</strong> the X and Y chromosomes. SHOX gene haploinsuficiency, due<br />

to microdeletions or intragenic mutations, causes a highly variable<br />

phenotype, ranging from isolated short stature to Leri-Weill dyscondrosteosis<br />

(LWD), while nullizygosity results in Langer mesomelic dysplasia<br />

(LMD).<br />

We described the clinical and cytogenetic findings <strong>of</strong> a familial case<br />

<strong>of</strong> SHOX haploinsuficiency due to a microdeletion inherited by an unusual<br />

mechanism. The proband, a six-year old girl, was referred to<br />

our clinic for growth failure. On physical examination she presented<br />

disproportionate short stature with mesomelic shortening <strong>of</strong> the limbs<br />

and appearance <strong>of</strong> muscular hypertrophy. There were no dysmorphic<br />

features, except relative macrocephaly and high arched palate. X-rays<br />

<strong>of</strong> the forearms showed no evidence <strong>of</strong> Madelung deformity. Endocrine<br />

studies and karyotype were normal. Fluorescence in situ hybridization<br />

(FISH), using a SHOX probe, revealed a microdeletion on one <strong>of</strong> the<br />

X chromosomes in the girl - 46,XX.ish del(X)(p22.3p22.3)(SHOX−)pat<br />

-, and on the Y chromosome in her father - 46,XY.ish del(Y)(p11.3p11.<br />

3)(SHOX−) -, who also shared similar features. These results suggest<br />

a prior meiotic recombination event on the father to account for the<br />

transfer <strong>of</strong> the deleted SHOX gene to the alternate sex chromosome.<br />

Only three cases <strong>of</strong> inherited SHOX deletions by the same mechanism<br />

have been reported. The recognition <strong>of</strong> the etiology <strong>of</strong> short stature in<br />

this family allowed an adequate genetic counseling.<br />

P02.108<br />

silver-Russell syndrome: a case report<br />

C. Vincent-Delorme 1 , S. Rossignol 2 , M. Holder-Espinasse 3 , O. Boute-Bénéjean<br />

3 , A. Coeslier-Dieux 3 , F. Petit 3 , S. Manouvrier-Hanu 3 , I. Netchine 2 ;<br />

1 Service de Génétique Clinique CHRU Lille. UF de Génétique CH Arras. Centre<br />

de Référence Maladies Rares pour les Syndromes Malformatifs et Anomalies<br />

du Développement Nord de France, Lille, France, 2 Biologie Moléculaire Endocrinienne.<br />

Centre de Référence des Maladies Endocriniennes Rares de la<br />

Croissance. Hôpital Trousseau (APHP), Paris, France, 3 Service de Génétique<br />

Clinique CHRU Lille. Centre de Référence Maladies Rares pour les Syndromes<br />

Malformatifs et Anomalies du Développement Nord de France, Lille, France.<br />

We report on a 33 years old male, with moderate adult Silver-Russell<br />

syndrome presentation. He was born at 41 weeks <strong>of</strong> gestation by<br />

spontaneous delivery with intrauterine growth retardation. Birth length<br />

was 46cm (-2 SDS), birth weight was 2200g (-3.5 SDS), and occipit<strong>of</strong>rontal<br />

circunference was 35cm (+1SDS). At 1 month he was suspected<br />

to develop hydrocephalus and at 1 year, because <strong>of</strong> prominent<br />

skin scalp vessels and systolic murmur, he was thought to present cerebral<br />

vascular malformation. Additional investigations were all normal.<br />

At 12 years, ultrasonography and skeletal x-rays showed asymmetric<br />

kidneys and delayed bone age. He grew up without feeding difficulties<br />

(BMI= -2 SDS at 2 years old) and did not receive growth hormone<br />

therapy; he demonstrated excessive sweating during childhood. Now,<br />

at 33 years old, his final height is152cm (-3.5 SDS) and he presents a<br />

slight lower limbs asymmetry, relative macrocephaly (+1.5 SDS), bilateral<br />

fifth finger clinodactyly, and triangular face.<br />

Methylation analysis <strong>of</strong> the 11p15 ICR1 region was performed and indicated<br />

loss <strong>of</strong> methylation, leading to biallelic expression <strong>of</strong> H19 and<br />

loss <strong>of</strong> expression <strong>of</strong> IGF2.<br />

We would like to emphasize the relative good clinical evolution <strong>of</strong> this<br />

male patient without hormonotherapy, nor feeding enteral requirement<br />

eventhough his short stature is a real socio-pr<strong>of</strong>essional disability<br />

which is not enough recognized by the institutions. We speculate that<br />

given the difficulty <strong>of</strong> assessing this diagnosis especially in adults, this<br />

syndrome must be underdiagnosed until molecular analysis is performed.<br />

P02.109<br />

A family with spinocerebellar ataxia type 8, Friedreich‘s ataxia<br />

and Hemoglobine s<br />

F. Koc 1 , A. Nazli Basak 2 ;<br />

1 Cukurova University School <strong>of</strong> Medicine, Department <strong>of</strong> Neurology, Adana,<br />

Turkey, 2 Bogazici University, Department <strong>of</strong> Molecular Biology and <strong>Genetics</strong>,<br />

Istanbul, Turkey.<br />

Spinocerebellar ataxias (SCA) are is a heredodegenerative disease. It<br />

is classified according to the clinical signs, affected neuroanatomical<br />

regions and genetic features. SCA type 8 is characterized by gait and<br />

limb ataxia, dysarthria, nystagmus, pyramidal findings and decreased

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