当前位置： SCI文献检索 > PLOS BIOLOGY期刊下所有文献 > Lack of support for the association between GAD2 polymorphisms and severe human obesity.

Lack of support for the association between GAD2 polymorphisms and severe human obesity.

Abstract：

:The demonstration of association between common genetic variants and chronic human diseases such as obesity could have profound implications for the prediction, prevention, and treatment of these conditions. Unequivocal proof of such an association, however, requires independent replication of initial positive findings. Recently, three (-243 A>G, +61450 C>A, and +83897 T>A) single nucleotide polymorphisms (SNPs) within glutamate decarboxylase 2 (GAD2) were found to be associated with class III obesity (body mass index > 40 kg/m2). The association was observed among 188 families (612 individuals) segregating the condition, and a case-control study of 575 cases and 646 lean controls. Functional data supporting a pathophysiological role for one of the SNPs (-243 A>G) were also presented. The gene GAD2 encodes the 65-kDa subunit of glutamic acid decarboxylase-GAD65. In the present study, we attempted to replicate this association in larger groups of individuals, and to extend the functional studies of the -243 A>G SNP. Among 2,359 individuals comprising 693 German nuclear families with severe, early-onset obesity, we found no evidence for a relationship between the three GAD2 SNPs and obesity, whether SNPs were studied individually or as haplotypes. In two independent case-control studies (a total of 680 class III obesity cases and 1,186 lean controls), there was no significant relationship between the -243 A>G SNP and obesity (OR = 0.99, 95% CI 0.83-1.18, p = 0.89) in the pooled sample. These negative findings were recapitulated in a meta-analysis, incorporating all published data for the association between the -243G allele and class III obesity, which yielded an OR of 1.11 (95% CI 0.90-1.36, p = 0.28) in a total sample of 1,252 class III obese cases and 1,800 lean controls. Moreover, analysis of common haplotypes encompassing the GAD2 locus revealed no association with severe obesity in families with the condition. We also obtained functional data for the -243 A>G SNP that does not support a pathophysiological role for this variant in obesity. Potential confounding variables in association studies involving common variants and complex diseases (low power to detect modest genetic effects, overinterpretation of marginal data, population stratification, and biological plausibility) are also discussed in the context of GAD2 and severe obesity.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Swarbrick MM,Waldenmaier B,Pennacchio LA,Lind DL,Cavazos MM,Geller F,Merriman R,Ustaszewska A,Malloy M,Scherag A,Hsueh WC,Rief W,Mauvais-Jarvis F,Pullinger CR,Kane JP,Dent R,McPherson R,Kwok PY,Hinney A,Hebebrand J

doi

10.1371/journal.pbio.0030315

keywords:

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

e315

issue

eissn

1544-9173

issn

1545-7885

pii

04-PLBI-RA-0945R2

journal_volume

pub_type

杂志文章,多中心研究

在线工具

Lack of support for the association between GAD2 polymorphisms and severe human obesity.