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Genome-wide association scans identified CTNNBL1 as a novel gene for obesity.

Abstract：

:Obesity is a major public health problem with strong genetic determination; however, the genetic factors underlying obesity are largely unknown. In this study, we performed a genome-wide association scan for obesity by examining approximately 500 000 single-nucleotide polymorphisms (SNPs) in a sample of 1000 unrelated US Caucasians. We identified a novel gene, CTNNBL1, which has multiple SNPs associated with body mass index (BMI) and fat mass. The most significant SNP, rs6013029, achieved experiment-wise P-values of 2.69 x 10(-7) for BMI and of 4.99 x 10(-8) for fat mass, respectively. The SNP rs6013029 minor allele T confers an average increase in BMI and fat mass of 2.67 kg/m(2) and 5.96 kg, respectively, compared with the alternative allele G. We further genotyped the five most significant CTNNBL1 SNPs in a French case-control sample comprising 896 class III obese adults (BMI > or = 40 kg/m(2)) and 2916 lean adults (BMI < 25 kg/m(2)). All five SNPs showed consistent associations with obesity (8.83 x 10(-3) < P < 6.96 x 10(-4)). Those subjects who were homozygous for the rs6013029 T allele had 1.42-fold increased odds of obesity compared with those without the T allele. The protein structure of CTNNBL1 is homologous to beta-catenin, a family of proteins containing armadillo repeats, suggesting similar biological functions. beta-Catenin is involved in the Wnt/beta-catenin-signaling pathway which appears to contribute to maintaining the undifferentiated state of pre-adipocytes by inhibiting adipogenic gene expression. Our study hence suggests a novel mechanism for the development of obesity, where CTNNBL1 may play an important role. Our study also provided supportive evidence for previously identified associations between obesity and INSIG2 and PFKP, but not FTO.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Liu YJ,Liu XG,Wang L,Dina C,Yan H,Liu JF,Levy S,Papasian CJ,Drees BM,Hamilton JJ,Meyre D,Delplanque J,Pei YF,Zhang L,Recker RR,Froguel P,Deng HW

doi

10.1093/hmg/ddn072

subject

Has Abstract

pub_date

2008-06-15 00:00:00

pages

1803-13

issue

eissn

0964-6906

issn

1460-2083

pii

ddn072

journal_volume

pub_type

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Genome-wide association scans identified CTNNBL1 as a novel gene for obesity.