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2009 Vienna - European Society of Human Genetics

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Molecular basis <strong>of</strong> Mendelian disorders<br />

lymphatic gusher at stapes surgery and with a characteristic inner ear<br />

malformation. We have defined the phenotype <strong>of</strong> 8 independent females<br />

carrying POU3F4 anomalies. A late-onset hearing loss is found<br />

in 3 patients. Only one has an inner ear malformation. No genotype/<br />

phenotype correlation is identified.<br />

P12.077<br />

An autosomal recessive nonsyndromic deafness locus is<br />

assigned to chromosome 18q12.3-21.1<br />

E. Pras 1 , H. Masri 1 , H. Reznik Wolf 1 , A. Abu 1 , Z. Brownstein 2 , K. B. Avraham 2 ,<br />

M. Frydman 1 ;<br />

1 Danek Gartner Institute <strong>of</strong> <strong>Human</strong> <strong>Genetics</strong>, Tel Hashomer, Israel, 2 Dept. <strong>of</strong><br />

<strong>Human</strong> Molecular <strong>Genetics</strong> & Biochemistry, Sackler School <strong>of</strong> Medicine, Tel<br />

Aviv, Israel.<br />

We studied a large non-consanguineous Ashkenazi family in which 5<br />

<strong>of</strong> 10 children suffer from pr<strong>of</strong>ound, prelingual hearing loss. A genome<br />

wide search mapped the disease gene to a n 8 Mb interval on chromosome<br />

18q12.3-21.1, and a maximum lod score <strong>of</strong> 3.03 was obtained<br />

with the marker AC021763 at θ =0.00. Saturation <strong>of</strong> the region with<br />

additional polymorphic markers and SNP’s revealed a 3.5 Mb homozygous<br />

interval in the affected sibs. The region contains 12 known genes,<br />

none <strong>of</strong> which have been previously associated with hearing loss. Sequencing<br />

<strong>of</strong> one gene from the interval, SLC14A1 did not reveal any<br />

pathogenic variants in the exons or in the flanking intronic sequences.<br />

Currently additional genes are being sequenced. These results define<br />

a novel locus for autosomal recessive hearing loss on chromosome<br />

18q12.3-21.1.<br />

P12.078<br />

High-resolution breakpoint mapping <strong>of</strong> novel rearrangements<br />

involved in alpha- and beta-thalassemia using arraycomparative<br />

Genomic Hybridization (acGH)<br />

M. Phylipsen, I. P. Vogelaar, Y. Ariyurek, J. T. den Dunnen, P. C. Giordano, C.<br />

L. Harteveld;<br />

Leiden University Medical Center, Leiden, The Netherlands.<br />

Thalassemias are hereditary microcytic hypochromic anemias characterized<br />

by abnormalities in hemoglobin production due to reduced expression<br />

<strong>of</strong> either the beta-globin gene, leading to beta-thalassemia, or<br />

the alpha-globin genes, giving rise to alpha-thalassemia. About 10% <strong>of</strong><br />

the beta-thalassemias and 90% <strong>of</strong> the alpha-thalassemias are caused<br />

by deletions in either globin gene cluster. In a previous study, we applied<br />

Multiplex Ligation-dependent Probe Amplification (MLPA) to<br />

characterize large rearrangements in the alpha- and beta-globin gene<br />

cluster. Several new deletions and duplications were found, however,<br />

the exact breakpoint sequences are still unknown. To facilitate confirmation<br />

by breakpoint PCR and to gain more insight in the mechanisms<br />

causing these rearrangements we decided to determine the precise<br />

location <strong>of</strong> breakpoints.<br />

Array Comparative Genomic Hybridization (aCGH) measures DNA<br />

copy number differences between a reference and a patient’s genome<br />

sample thereby detecting and mapping deletions and duplications.<br />

We used high resolution tiling arrays with 135,000 probes spaced at<br />

a density <strong>of</strong> ~15 bp to map the breakpoints to an interval that can be<br />

validated by PCR and sequencing. The array was hybridized to a set<br />

<strong>of</strong> 55 thalassemia patients who were found to carry a deletion in the<br />

alpha- or beta-globin gene cluster. The fine mapping results were used<br />

to design breakpoint PCRs and resulting fragments were sequenced<br />

to determine the precise breakpoint.<br />

P12.079<br />

Multiplex ligation-probe dependent amplification (MLPA) and<br />

Hemophilia A: detection <strong>of</strong> deletions in patients and tool for<br />

carrier status in female relatives.<br />

R. Santacroce1 , V. Longo1 , V. Bafunno1 , F. Sessa1 , M. Chetta1 , M. Sarno1 , N.<br />

Bukvic1 , G. D’Andrea1 , M. Margaglione1,2 ;<br />

1 2 Genetica Medica, Foggia, Italy, Unita’ di Emostasi e Trombosi I.R.C.C.S.<br />

“Casa Sollievo della S<strong>of</strong>ferenza”,, San Giovanni Rotondo, Italy.<br />

Haemophilia A is an X-linked bleeding disorder caused by mutations<br />

widespread in the human coagulation F8 gene. Most <strong>of</strong> the mutations<br />

in the F8 gene are detectable using genomic sequencing analysis.<br />

However, deletions <strong>of</strong> one or more exons or encompassing the entire<br />

gene can go undetected, especially in heterozygous females.<br />

Recently, MLPA has been broadly applied to gene mutation screening<br />

to detect exon deletions and duplications. Different deletions were detected<br />

using MLPA assay on 25 patients affected by severe haemophilia<br />

A, resulted mutation negative by sequencing analysis. Traditional<br />

PCR failed to amplify one or more exons in some <strong>of</strong> these patients and<br />

we decided to use the MLPA test in order to confirm the conjectured<br />

deletions: 7 deletions were revealed in haemophiliacs patients and we<br />

identified the carrier status in 2 female.<br />

F8 mutational screening could be improved by adding MLPA to sequence<br />

analysis and MLPA is a helpful tool in order to define the status<br />

<strong>of</strong> carriers in female relatives <strong>of</strong> haemophiliacs with deletions <strong>of</strong> one or<br />

more exons <strong>of</strong> F8 gene. It is to underline the importance <strong>of</strong> performing<br />

a molecular analysis in females suspected haemophiliacs carriers: the<br />

main obstacle to their counselling is the impossibility to demonstrate<br />

a heterozygous status because <strong>of</strong> the amplification <strong>of</strong> the exon/s that<br />

is/are present on the normal X chromosome. So, the only way to make<br />

a definitive diagnosis is to detect the mutation in F8 gene and MLPA<br />

provides an important tool for the detection <strong>of</strong> its complete mutational<br />

spectrum.<br />

P12.080<br />

Genotyping <strong>of</strong> coagulation Factor iX gene in Hemophilia B<br />

Patients <strong>of</strong> Esfahan Province<br />

L. Kokabee 1,2 , N. karimi 1 , S. Zeinali 1 , M. Karimipoor 1 ;<br />

1 Molecular Medicine dept., Biotechnology Center, Pasteur Inistitute <strong>of</strong> Iran,<br />

Tehran, Islamic Republic <strong>of</strong> Iran, 2 Khatam University, Tehran, Islamic Republic<br />

<strong>of</strong> Iran.<br />

Hemophilia B, Christmas disease, is an X-linked bleeding disorder<br />

caused by the functional deficiency <strong>of</strong> blood coagulation factor IX. The<br />

disease is due to heterogeneous mutations in the factor IX gene (F9),<br />

located at Xq27.1. It spans about 34 kilobases (kb) <strong>of</strong> genomic DNA.<br />

The aim <strong>of</strong> this study was molecular analysis and genotype- phenotype<br />

correlation <strong>of</strong> hemophilia B patients in Isfahan province, Iran. After<br />

obtaining informed consent, genomic DNA was extracted from the peripheral<br />

blood <strong>of</strong> 37 patients referred from Isfahan hemophilia center,<br />

by standard methods. PCR amplification, SSCP and CSGE techniques<br />

were performed for scanning <strong>of</strong> the all functional-important regions <strong>of</strong><br />

the F9 gene. DNA sequencing were performed for those with different<br />

migration patterns in SSCP or CSGE by chain termination method. In<br />

addition, haplotype were constructed using four the DdeI, TaqI, HhaI<br />

and MnlI restriction fragment length polymorphisms (RFLPs) markers.<br />

The sequencing results showed 70.3% missense mutation, 18.9%<br />

nonsense mutation, 8.1% deletion, 2.7% insertion. In this study, <strong>of</strong> the<br />

19 hemophilia B patients <strong>of</strong> the Kashan, all <strong>of</strong> them were represented<br />

substitution (G6472A) that could represent a founder effect. Five novel<br />

mutations which have not been reported in hemophilia B mutation<br />

database, were also found. The information obtained from this study<br />

could be used to diagnose potential female carriers in families with<br />

hemophilia B patients and prenatal diagnosis.<br />

P12.082<br />

molecular screening <strong>of</strong> 980 cases <strong>of</strong> suspected hereditary optic<br />

neuropathy with a report on 77 novel OPA1 mutations<br />

M. Ferré 1,2,3 , D. Milea 4,5 , A. Chevrollier 1,3 , H. Dollfus 6,7,8 , C. Ayuso 9 , S. Defoort<br />

10,11,12 , C. Vignal 13 , X. Zanlonghi 13,14 , J. Charlin 15,16 , J. Kaplan 17,18,19 , S.<br />

Odent 15,20 , C. P. Hamel 21,22 , V. Procaccio 2,3,23 , P. Reynier 1,2,3 , P. Amati-Bonneau 1,3 ,<br />

D. Bonneau 1,2,3 ;<br />

1 INSERM, U694, Angers, France, 2 Université d’Angers, Faculté de Médecine,<br />

Angers, France, 3 CHU d’Angers, Département de Biochimie et Génétique,<br />

Angers, France, 4 Glostrup Hospital, Department <strong>of</strong> Ophthalmology, Glostrup,<br />

Denmark, 5 University <strong>of</strong> Copenhagen, Copenhagen, Denmark, 6 INSERM,<br />

Equipe Avenir 3439, Strasbourg, France, 7 Université Louis Pasteur-Strasbourg,<br />

Faculté de Médecine, Laboratoire de Génétique Médicale, Strasbourg, France,<br />

8 CHRU de Strasbourg, Service de Génétique Médicale, Strasbourg, France,<br />

9 Fundación Jiménez Díaz, Servicio de Genética, CIBERER, Madrid, Spain,<br />

10 CNRS, UMR 8160, Lille, France, 11 Université de Lille 2, Lille, France, 12 CHRU<br />

de Lille, Hôpital Roger Salengro, Service d’Explorations Fonctionnelles de la<br />

Vision, Lille, France, 13 Fondation Rothschild, Département d’Ophtalmologie,<br />

Paris, France, 14 Clinique Sourdille, Laboratoire d’Explorations Fonctionnelles<br />

de la Vision, Nantes, France, 15 Université de Rennes 1, Faculté de Médecine,<br />

Rennes, France, 16 CHU de Rennes, Service d’Ophtalmologie, Rennes, France,<br />

17 INSERM, U781, Unité de Recherches Génétique et Epigénétique des Maladies<br />

Métaboliques, Neurosensorielles et du Développement, Paris, France,<br />

18 Université Paris Descartes, Faculté de Médecine, Paris, France, 19 AP-HP,

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