Polymorphisms in the amino acid transporter solute carrier family 6 (neurotransmitter transporter) member 14 gene contribute to polygenic obesity in French Caucasians

Diabetes
Emmanuelle DurandP Froguel

Abstract

Positional candidate gene analysis of the obesity-linked chromosome Xq24 locus identified two obesity-associated single nucleotide polymorphisms (SNPs) in the membrane amino acid transporter encoding the SLC6A14 (solute carrier family 6 [neurotransmitter transporter], member 14) gene in the Finnish population. Since we previously reported a modest evidence of linkage for this region in French obese families, we analyzed these SNPs in 1,267 obese adult case and 649 lean control subjects. SNPs 20649 C>T (odds ratio 1.23, 95% CI 1.04-1.45; P = 0.013) and 22510 C>G (1.36, 1.16-1.59; P = 0.0001) were shown to be associated with obesity in the French population. In addition, pedigree disequilibrium test results showed a modest excess of both at-risk SNP alleles in affected offspring (P = 0.05 and P = 0.08 for SNPs 20649 C>T and 22510 C>G, respectively). The SNP 22510 C>G at-risk G allele was associated, both in adult women with moderate obesity and in 234 obese girls, with higher body fat and modified perception of hunger and satiety (0.003 < P < 0.06). In conclusion, these data confirm an association of the SLC6A14 gene locus with obesity.

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