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2009 Vienna - European Society of Human Genetics

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Evolutionary and population genetics, and Genetic epidemiology<br />

Acknowledgement: The study was supported by Research Grant<br />

Council (RGC), Hong Kong SAR government.<br />

P10.46<br />

interleukin-23 receptor gene polymorphisms in Hungarian<br />

patients with psoriasis<br />

E. Sáfrány 1 , M. Széll 2 , V. Csöngei 1 , L. Járomi 1 , A. Maász 1 , C. Sipeky 1 , B. Melegh<br />

1 ;<br />

1 Department <strong>of</strong> Medical <strong>Genetics</strong> and Child Development, University <strong>of</strong> Pécs,<br />

Pécs, Hungary, 2 Department <strong>of</strong> Rheumatology and Allergology, University <strong>of</strong><br />

Szeged, Szeged, Hungary.<br />

Background: Psoriasis is a chronic inflammatory disease that affects<br />

the skin and joints. Its prevalence rates vary from 0-5% to 4-6% between<br />

countries and races, affecting 2-3% <strong>of</strong> whites <strong>of</strong> <strong>European</strong><br />

descent. Recently, associations were found between several autoimmune<br />

diseases including psoriasis and variants <strong>of</strong> interleukin-23 receptor<br />

(IL23R) gene. In our current work we analysed the association<br />

<strong>of</strong> nine polymorphisms <strong>of</strong> IL23R with psoriasis in Hungarian samples.<br />

Methods: Groups <strong>of</strong> patients with psoriasis (n=214) and unrelated,<br />

clinically healthy control subjects (n=192) were genotyped using PCR-<br />

RFLP methods. Results: We observed a significant increase in the<br />

carriage <strong>of</strong> the minor allele <strong>of</strong> rs11805303 in the psoriasis group compared<br />

to controls conferring a 1.55-fold risk for the development <strong>of</strong><br />

psoriasis (p=0.029; OR=1.55; 95% CI: 1.05-2.29). Similarly, in psoriasis<br />

patients the homozygous carrying <strong>of</strong> the minor allele <strong>of</strong> rs2201841<br />

or rs10889677 conferred a more than 2-, and 3-fold increase for<br />

the development <strong>of</strong> psoriasis, respectively (for rs2201841: p=0.024;<br />

OR=2.41; 95% CI: 1.12-5.15; for rs10889677: p=0.008; OR=3.04; 95%<br />

CI: 1.34-6.92). Conclusions: We confirmed the associations <strong>of</strong> IL23R<br />

polymorphisms with psoriasis in a Hungarian population, and were first<br />

to demonstrate the effect <strong>of</strong> the rs11805303 intronic SNP on the disease.<br />

P10.47<br />

the incidence <strong>of</strong> inborn Erros <strong>of</strong> metabolism (iEm) in Estern<br />

Province <strong>of</strong> saudi Arabia<br />

H. Moammar1 , G. Cheriyan2 , N. Al-Sannaa2 ;<br />

1 2 King Fahed University Hospital, Khobar, Saudi Arabia, Dhahran Health Center,<br />

Dhahran, Saudi Arabia.<br />

Objective: To determine the number <strong>of</strong> children born with Inborn Errors<br />

<strong>of</strong> Metabolism (IEM) from 1983-2008 within the Saudi Aramco Medical<br />

Services Organization (SAMSO) medical centers. This population is<br />

a relatively stable well defined population <strong>of</strong> the Eastern province <strong>of</strong><br />

Saudi Arabia where a thorough follow up system is provided to all the<br />

patients.<br />

Methods: The records <strong>of</strong> all patients, born from January 1983-December<br />

2008 within SAMSO facility and diagnosed with IEM.<br />

Results: Over the last 25 years, 165,530 infants were born and followed<br />

up at SAMSO. Among these infants, 248 were diagnosed with<br />

different types <strong>of</strong> IEM. The over all estimated incidence was 150 cases<br />

per 100,000 live births. 54 % <strong>of</strong> these were labeled as small molecules<br />

disorders such as aminoacidopathy, organic acidopathy, urea cycle<br />

disorders and fatty acids oxidation disorders. Organic acidopathy was<br />

the most commonly diagnosed small molecule disorder (29/100,000).<br />

Lysosomal Storage Diseases (LSD) was diagnosed in 31.5 % <strong>of</strong> children.<br />

43 % <strong>of</strong> these were mucopolysaccharidosis (MPS) and the most<br />

common type was MPS VI. The incidence per 100,000 live births for<br />

each group was estimated.<br />

Conclusion: Our data provides a good estimate <strong>of</strong> IEM incidence in<br />

the population studied. Consanguinity plays a major role in the high<br />

incidence <strong>of</strong> single gene autosomal recessive disorders among this<br />

population. However, we believe this data still underestimated the true<br />

incidence. Therefore, regional newborn screening program will help<br />

provide the best estimation <strong>of</strong> the incidence <strong>of</strong> IEM in this population.<br />

P10.48<br />

is there a need for functionally-enriched tagsNPs sets in<br />

candidate gene case-control association studies? An IRAK<br />

gene re-sequencing data exploration<br />

M. Pino-Yanes 1,2 , T. Klassert 3 , L. Perez-Mendez 1,2 , A. Corrales 1,2 , M. Hernandez<br />

3 , J. Villar 1,4 , C. Flores 1,2 ;<br />

1 CIBER de Enfermedades Respiratorias, Spain, 2 Research Unit, Hospital Universitario<br />

NS de Candelaria, Spain, 3 Department <strong>of</strong> <strong>Genetics</strong>, Universidad de<br />

La Laguna, Spain, 4 MODERN, Research Unit, Hospital Universitario Dr. Negrin,<br />

Spain.<br />

Interleukin-1 receptor-associated kinase 3 gene (IRAK3) is a candidate<br />

susceptibility gene for complex disease processes such as asthma<br />

and sepsis. Before validating these associations in the Spanish population,<br />

here we used re-sequencing data <strong>of</strong> the gene from this population<br />

to select different sets <strong>of</strong> tagging SNPs (tagSNPs), one including<br />

potentially functional variants (set1) and a second set unselected for<br />

their functionality (set2), and compared their accuracy in predicting untyped<br />

variants. Additionally, we explored how well a set <strong>of</strong> tagSNPs<br />

chosen from the <strong>European</strong> HapMap samples data (set3) performed in<br />

the Spanish population. These three sets were used to estimate minor<br />

allele frequencies (MAFs) <strong>of</strong> untyped variants using TUNA s<strong>of</strong>tware. A<br />

high correlation between observed and estimated MAFs was found for<br />

all three sets (R 2 >0.95). Differences between observed and estimated<br />

MAFs were similar for set1 and set2 (~7%) and were much higher for<br />

set3 (34%), being reduced by two-fold (1.7%, 2.7% and 17%, respectively)<br />

for common variants (MAF≥10%). On the basis <strong>of</strong> these results,<br />

we propose that only common (MAF≥10%) untyped variants <strong>of</strong> this<br />

gene should be considered for association studies, especially when<br />

tagSNPs are selected from a reference HapMap population. Although<br />

functionally-enriched tagSNPs sets might be a straightforward way <strong>of</strong><br />

exploring the association <strong>of</strong> a candidate gene with disease, their use<br />

increase genotyping costs without improving the accuracy in predicting<br />

untyped variants or the coverage <strong>of</strong> the gene.<br />

Supported by grants from the Spanish Ministry <strong>of</strong> Science and Innovation<br />

SAF2004-06833, PI081383 and EMER07/001.<br />

P10.49<br />

Association <strong>of</strong> iL-10 promoter genetic polymorphisms with<br />

the risk <strong>of</strong> Kawasaki Disease and outcome <strong>of</strong> coronary artery<br />

lesions<br />

L. Ger 1,2 , T. Lai 2 , K. Hsieh 3 , Y. Hwang 4 , K. Weng 3 , S. Huang 1 , Y. Chiao 2 , M. Lin 5 ;<br />

1 Department <strong>of</strong> Medical Education and Research, Kaohsiung Veterans General<br />

Hospital, Kaohsiung, Taiwan, 2 Institute <strong>of</strong> Biomedical Sciences, National<br />

SunYat-Sen University, Kaohsiung, Taiwan, 3 Department <strong>of</strong> Paediatric Cardiology,<br />

Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, 4 Department<br />

<strong>of</strong> Cardiology, Fon-Lin Veterans Hospital, Hua-Lan, Taiwan, 5 Institute <strong>of</strong> Public<br />

Health, National Yang-Ming University, Taipei, Taiwan.<br />

Kawasaki disease (KD) is the most common cause <strong>of</strong> paediatric acquired<br />

heart disease. Recent studies have indicated that the acute<br />

KD patients were with 3-33 fold higher levels <strong>of</strong> interleukin-10 (IL-10)<br />

in plasma. Therefore, a family-based association study <strong>of</strong> 101 caseparents<br />

trios and a matched case-control study <strong>of</strong> 76 KD cases with<br />

coronary artery lesions (CALs) and 76 KD controls without CALs were<br />

carried out to evaluate the association <strong>of</strong> SNPs in IL-10 promoter (-<br />

1082, -819, and -592) with the risk <strong>of</strong> KD and CALs. Based on the<br />

TDT results, there were significant differences in the transmission <strong>of</strong><br />

IL-10-819 and -592 SNPs (p=0.005 and 0.012, respectively). In addition,<br />

the TC and CC genotypes <strong>of</strong> IL-10-819T>C were associated<br />

with the increased risk <strong>of</strong> KD (AOR, 1.33; 95%CI, 0.71-2.50 and AOR,<br />

3.25; 95%CI, 1.15-9.22, respectively) but decreased risk <strong>of</strong> CALs<br />

(AOR, 0.93; 95%CI, 0.47-1.81 and AOR, 0.074; 95%CI, 0.01-0.62,<br />

respectively), as compared to TT genotype. The AC and CC genotypes<br />

<strong>of</strong> IL-10-592A>C were with borderline significance <strong>of</strong> increased<br />

risk <strong>of</strong> KD but decreased risk <strong>of</strong> CALs (AOR, 0.90; 95%CI, 0.46-1.75<br />

and AOR, 0.03; 95%CI, 0.03-0.87, respectively), as compared to AA<br />

genotype. Furthermore, as compared with TA/TA diplotype (defined by<br />

-819T>C and -592A>C), CC/CC diplotype <strong>of</strong> IL10 was associated with<br />

the increased risk <strong>of</strong> KD (AOR, 3.25; 95%CI, 1.15-9.22) but with the<br />

decreased risk <strong>of</strong> CALs (AOR, 0.18; 95%CI, 0.04-0.72). In conclusion,<br />

IL10-819 and -592 SNPs played important but contrary roles in the<br />

susceptibility <strong>of</strong> KD and CALs outcome.<br />

P10.50<br />

Kinship and fertility in a fast-growing population<br />

M. Tremblay, M. Jomphe, B. Casgrain, È. Lavoie, M. Bouchard, H. Vézina;<br />

Université du Québec à Chicoutimi, Chicoutimi, QC, Canada.<br />

The relation between kinship and fertility has been investigated in<br />

many populations, with mixed results regarding the advantage or<br />

disadvantage <strong>of</strong> consanguineous unions on reproductive success. In<br />

most cases though, measures <strong>of</strong> kinship were limited to close links<br />

due to lack <strong>of</strong> genealogical data. In this study we investigated a to-

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