Genetic variation in a member of the laminin gene family affects variation in body composition in Drosophila and humansReportar como inadecuado

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BMC Genetics

, 9:52

First Online: 11 August 2008Received: 29 November 2007Accepted: 11 August 2008


BackgroundThe objective of the present study was to map candidate loci influencing naturally occurring variation in triacylglycerol TAG storage using quantitative complementation procedures in Drosophila melanogaster. Based on our results from Drosophila, we performed a human population-based association study to investigate the effect of natural variation in LAMA5 gene on body composition in humans.

ResultsWe identified four candidate genes that contributed to differences in TAG storage between two strains of D. melanogaster, including Laminin A LanA, which is a member of the α subfamily of laminin chains. We confirmed the effects of this gene using a viable LanA mutant and showed that female flies homozygous for the mutation had significantly lower TAG storage, body weight, and total protein content than control flies. Drosophila LanA is closely related to human LAMA5 gene, which maps to the well-replicated obesity-linkage region on chromosome 20q13.2-q13.3. We tested for association between three common single nucleotide polymorphisms SNPs in the human LAMA5 gene and variation in body composition and lipid profile traits in a cohort of unrelated women of European American EA and African American AA descent. In both ethnic groups, we found that SNP rs659822 was associated with weight EA: P = 0.008; AA: P = 0.05 and lean mass EA: P= 0.003; AA: P = 0.03. We also found this SNP to be associated with height P = 0.01, total fat mass P = 0.01, and HDL-cholesterol P = 0.003 but only in EA women. Finally, significant associations of SNP rs944895 with serum TAG levels P = 0.02 and HDL-cholesterol P = 0.03 were observed in AA women.

ConclusionOur results suggest an evolutionarily conserved role of a member of the laminin gene family in contributing to variation in weight and body composition.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2156-9-52 contains supplementary material, which is available to authorized users.

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Autor: Maria De Luca - Michelle Moses Chambers - Krista Casazza - Kerry H Lok - Gary R Hunter - Barbara A Gower - José R Fer


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