24.08.2013 Views

2009 Vienna - European Society of Human Genetics

2009 Vienna - European Society of Human Genetics

2009 Vienna - European Society of Human Genetics

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Genetic analysis, linkage ans association<br />

P17.25<br />

Association study between variants in GAS -TAM genes and<br />

atheroma carotid plaque<br />

B. Hurtado 1 , N. Abasolo 1,2 , X. Muñoz 1 , N. García 1 , J. Krupinski 3 , P. García de<br />

Frutos 4 , N. Sala 1 ;<br />

1 Catalan Institute <strong>of</strong> Oncology-IDIBELL, Hospitalet de LLobregat, Spain, 2 Universitat<br />

Rovira i Virgili, Reus, Spain, 3 Hospital Universitari Mútua de Terrassa,<br />

Terrassa, Spain, 4 Institute for Biomedical Research <strong>of</strong> Barcelona (IIBB-CSIC-<br />

IDIBAPS), Barcelona, Spain.<br />

Previous studies <strong>of</strong> our group indicated an association between a SNP<br />

and a haplotype <strong>of</strong> GAS6 and stroke. Carotid atherosclerosis (CA) is<br />

a common cause <strong>of</strong> stroke and recent studies suggest that pathways<br />

initiated by the interaction <strong>of</strong> the plasma vitamin K-dependent protein<br />

GAS6 with the tyrosine kinase receptors TYRO3, AXL and MERTK<br />

(TAM) may have a relevant role in atherogenesis.<br />

The aim <strong>of</strong> this study was to analyze the genetic association between<br />

SNPs and haplotypes in GAS6-TAM genes and CA.<br />

We perfomed a case-control study with 145 patients who had CA confirmed<br />

by nuclear magnetic resonance and 162 patients who suffered<br />

from cardioembolic (non atherogenic) stroke. For all patient and control<br />

samples there was information on traditional risk factors. Genotyping<br />

<strong>of</strong> 19 selected SNPs was performed by real-time PCR, using both<br />

FRET or TaqMan probes.<br />

Minor allele frequencies were different between atherogenic and non<br />

atherogenic populations for the rs2277537 and rs16971872 SNPs<br />

in TYRO3. Adjusted logistic regression (LR) analyses indicated that<br />

rs2277537 in TYRO3 and rs869016 in MERTK associated to CA, respectively<br />

increasing (OR:2.72 [0.95-7.78]) and decreasing (OR=0.39<br />

[0.10-0.79]) the risk <strong>of</strong> CA. Linkage disequilibrium results were in concordance<br />

with the haplotype blocks described in HapMap and adjusted<br />

LR analyses revealed that the haplotypes GCTCA in TYRO3 and the<br />

ACAA in MERTK, both containing the minor allele <strong>of</strong> the associated<br />

SNPs, were also associated to CA. The association between GAS6-<br />

TAM SNPs and carotid atherosclerosis reinforce a physiological role <strong>of</strong><br />

the GAS6-TAM pathway in atherogenesis.<br />

P17.26<br />

the study <strong>of</strong> GATA gene tagging sNP in patients with arterial<br />

hypertension and ischemic heart disease<br />

O. G. Ivanova 1 , O. A. Makeeva 1 , A. A. Lezhnev 2 , I. V. Tsimbal’uk 3 , M. L.<br />

D´jakova 2 , K. V. Puzyrev 2 , V. A. Kazakov 2 , V. M. Shipulin 2 , V. P. Puzyrev 1,3 ;<br />

1 Research Institute <strong>of</strong> Medical <strong>Genetics</strong>, Tomsk, Russian Federation, 2 Research<br />

Institute <strong>of</strong> Cardiology, Tomsk, Russian Federation, 3 Siberian State<br />

Medical University, Tomsk, Russian Federation.<br />

Numerous researches demonstrated that calcineurin pathway plays a<br />

crucial role in cardiac hypertrophy and progression <strong>of</strong> heart failure. The<br />

aim was to study tagging SNPs in GATA4 gene in healthy individuals<br />

and patients with cardiovascular disease and cardiac hypertrophy.<br />

We selected tagging SNP in GATA4 gene and analyzed polymorphisms<br />

rs804271, rs8191515 in promoter and rs2898293 in intron <strong>of</strong><br />

GATA4 gene in patients with essential hypertension (n=155), ischemic<br />

heart disease (n=153), hypertension combined with diabetes mellitus<br />

2 (n= 90) and healthy volunteers (n=285).<br />

Genotype frequencies were in accordance with Hardy-Weinberg equilibrium.<br />

Frequency <strong>of</strong> rs804271 rare allele in control group was 47%;<br />

rs8191515 - 10%; and rs2898293 - 32%. Patients did not differe from<br />

healthy subjects in GATA4 gene allele and genotypes frequencies.To<br />

further analyze the role <strong>of</strong> genetic variants in cardiac remodelling we<br />

divided patients with essential hypertension and hypertension combined<br />

diabetes mellitus 2 into subgroups with left ventricular hypertrophy<br />

(LVH) and without LVH based on the left ventricle mass index.<br />

We had not revealed differences in GATA4 gene allele and genotypes<br />

frequencies between patients with and without LVH.<br />

In our previous studies it was shown that polymorphisms in two genes<br />

<strong>of</strong> calcineurin pathway (PPP3R1 and NFATC4) may be involved in cardiac<br />

remodeling in patients with arterial hypertension. It is essential<br />

to investigate polymorphisms <strong>of</strong> calcineurin pathway genes, including<br />

tagging SNP, because functional genetic variants in these genes are<br />

still unknown.<br />

P17.27<br />

Large scale genome wide association study identifies new<br />

genetic loci determining homocysteine levels<br />

J. B. J. van Meurs 1 , I. Cotlarciuc 2 , D. M. Waterworth 3 , F. Rivadeneira 1 , P. Vollenweider<br />

4 , G. Waeber 4 , B. Kato 2 , M. J. Brown 5 , J. Lindemans 1 , M. Breteler 1 , X.<br />

Yuan 3 , K. Song 3 , K. Estrada 1 , T. Spector 2 , V. Mooser 3 , A. G. Uitterlinden 1 , K. R.<br />

Ahmadi 2 ;<br />

1 ErasmusMC, Rotterdam, The Netherlands, 2 King’s college, London, United<br />

Kingdom, 3 GlaxoSmithKline, King <strong>of</strong> Prussia, PA, United States, 4 CHUV University<br />

Hospital, Lausanne, Switzerland, 5 University <strong>of</strong> Cambridge, Cambridge,<br />

United Kingdom.<br />

Elevated levels <strong>of</strong> plasma homocysteine (Hcy) are a risk factor for<br />

many common clinical conditions, including cardiovascular disease.<br />

Inter-individual variation in Hcy levels is highly heritable (h 2 ~70%), but<br />

the genetic component is poorly understood. We conducted the first<br />

genome-wide association study (GWAS) <strong>of</strong> plasma Hcy levels using<br />

four populations from Switzerland, the Netherlands and UK with a total<br />

sample size <strong>of</strong> 11,888 individuals. We identified five loci (seven independent<br />

associations) reaching genome-wide significance. Five <strong>of</strong> the<br />

seven associations were present in or near three previous candidate<br />

genes: MTHFR (rs1801133, p=2x10 -47 ; rs11121480, p=4x10 -19 ), CBS<br />

(rs6586282, p=5x10 -12 ; rs1789953, p=2x10 -11 ) and MTR (rs10925257,<br />

p=2x10 -9 ). We identified two completely novel loci including one on<br />

chromosome 16q24.3, rs908951 (p=2.1x10 -11 ), located in dipeptidase<br />

1 (DPEP1) and one on 11q14.3, rs7130284 (p=9x10 -11 ) in the NADPH<br />

oxidase 4 gene (NOX4). Neither gene has any obvious functional link<br />

to Hcy, although 16q24.3 also contains the Fanconi anemia gene FAN-<br />

CA and the top hit in this region (rs908951) is strongly associated with<br />

FANCA mRNA levels. A strong candidate gene in the 11q14.3 region<br />

is the PSMAL gene, which is highly homologous to folate hydrolase<br />

I, which is pivotal in the uptake <strong>of</strong> folate from the diet. Collectively,<br />

the 7 independent polymorphisms account for up to 4% <strong>of</strong> the variation<br />

in Hcy. We are currently investigating the impact <strong>of</strong> the 7 variants<br />

on cardiovascular disease. Our results provide a new insight into key<br />

physiological mechanisms that might underpin many complex diseases<br />

including cardiovascular disease and highlight novel therapeutic<br />

targets.<br />

P17.28<br />

Hunting for young-onset hypertension genes using a genomewide<br />

gene-based association method<br />

H. C. Yang1 , Y. J. Liang1 , K. M. Chiang2 , W. H. Pan2 ;<br />

1 2 Institute <strong>of</strong> Statistical Science Academia Sinica, Taipei, Taiwan, Institute <strong>of</strong><br />

Biomedical Sciences Academia Sinica, Taipei, Taiwan.<br />

Hypertension has high prevalence and large social impacts in various<br />

ethnic populations. Known hypertension-associated genes provide<br />

useful but not sufficient information to unravel this complex disorder.<br />

We conducted a genome-wide association study with 198 hypertensive<br />

patients and 192 normotensive controls <strong>of</strong> Han Chinese to identify<br />

novel disease genes <strong>of</strong> young-onset hypertension. All samples were<br />

genotyped with the Affymetrix <strong>Human</strong> Mapping 500K Set. A two-stage<br />

genome-wide association analysis with a SNP-based association scan<br />

at the first stage and a gene-based association scan at the second<br />

stage was performed. Logistic regression models with/without adjustments<br />

<strong>of</strong> age, gender and body mass index were fitted to infer SNP<br />

marginal effects and then a p-value combination method is applied<br />

to study gene effects. Multiple-test problem is corrected by considering<br />

a false discovery rate <strong>of</strong> one-thousandth, i.e., -log10(FDR)>3.<br />

Among 155,706 intergenic SNPs and 14,309 genes, we identify 23<br />

intergenic SNPs and 134 genes, which contain novel genes/SNPs and<br />

known genes involved in pathways <strong>of</strong> cardiovascular disease, metabolic<br />

disease, immune disease and cell development. The identified<br />

genes cover 2 - 207 intragenic SNPs probed on Affymetrix 500K Set.<br />

A gene-expression confirmation study and a SNP-replication study are<br />

in preparation.<br />

P17.29<br />

Novel polymorphic AluYb8 insertion in hypertension candidate<br />

gene WNK1<br />

M. Putku 1 , K. Kepp 1 , E. Org 1 , P. Juhanson 1 , G. Veldre 1,2 , P. Kelgo 1 , D. Comas 3 ,<br />

J. Bertranpetit 3 , V. Kozich 4 , E. Khusnutdinova 5 , M. Viigimaa 6 , M. Laan 1 ;<br />

1 Institute <strong>of</strong> Molecular and Cell Biology, Tartu, Estonia, 2 Department <strong>of</strong> Cardiology,<br />

University <strong>of</strong> Tartu, Estonia, 3 Institute <strong>of</strong> Evolutionary Biology, University

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!