Fine Mapping and Association Studies of a High-density Lipoprotein Cholesterol Linkage Region on Chromosome 16 in French-Canadian Subjects

Overview

Journal Eur J Hum Genet

Specialty Genetics

Date 2009 Oct 22

PMID 19844255

Citations 11

Authors

Zari Dastani

Paivi Pajukanta

Michel Marcil

Nicholas Rudzicz

Isabelle Ruel

Swneke D Bailey

Jenny C Lee

Mathieu Lemire

Janet Faith

Jill Platko

John Rioux

Thomas J Hudson

Daniel Gaudet

James C Engert

Jacques Genest

Affiliations

Soon will be listed here.

Abstract

Low levels of high-density lipoprotein cholesterol (HDL-C) are an independent risk factor for cardiovascular disease. To identify novel genetic variants that contribute to HDL-C, we performed genome-wide scans and quantitative association studies in two study samples: a Quebec-wide study consisting of 11 multigenerational families and a study of 61 families from the Saguenay-Lac St-Jean (SLSJ) region of Quebec. The heritability of HDL-C in these study samples was 0.73 and 0.49, respectively. Variance components linkage methods identified a LOD score of 2.61 at 98 cM near the marker D16S515 in Quebec-wide families and an LOD score of 2.96 at 86 cM near the marker D16S2624 in SLSJ families. In the Quebec-wide sample, four families showed segregation over a 25.5-cM (18 Mb) region, which was further reduced to 6.6 Mb with additional markers. The coding regions of all genes within this region were sequenced. A missense variant in CHST6 segregated in four families and, with additional families, we observed a P value of 0.015 for this variant. However, an association study of this single-nucleotide polymorphism (SNP) in unrelated Quebec-wide samples was not significant. We also identified an SNP (rs11646677) in the same region, which was significantly associated with a low HDL-C (P=0.016) in the SLSJ study sample. In addition, RT-PCR results from cultured cells showed a significant difference in the expression of CHST6 and KIAA1576, another gene in the region. Our data constitute additional evidence for a locus on chromosome 16q23-24 that affects HDL-C levels in two independent French-Canadian studies.

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