Genetic variation in SH3-domain GRB2-like (endophilin)-interacting protein 1 has a major impact on fat mass

N. Cummings, K. A. Shields, J. E. Curran, K. Bozaoglu, J. Trevaskis, K. Gluschenko, G. Cai, A. G. Comuzzie, T. D. Dyer, K. R. Walder, P. Zimmet, G. R. Collier, J. Blangero, J. B.M. Jowett

    Research output: Contribution to journalArticlepeer-review

    12 Scopus citations

    Abstract

    Objective: The SH3-domain GRB2-like (endophilin)-interacting protein 1 (SGIP1) gene has been shown to be differentially expressed in the hypothalamus of lean versus obese Israeli sand rats (Psammomys obesus), and is suspected of having a role in regulating food intake. The purpose of this study was to assess the role of genetic variation in SGIP1 in human disease. Subjects: We performed single-nucleotide polymorphism (SNP) genotyping in a large family pedigree cohort from the island of Mauritius. The Mauritius Family Study (MFS) consists of 400 individuals from 24 Indo-Mauritian families recruited from the genetically homogeneous population of Mauritius. We measured markers of the metabolic syndrome, including diabetes and obesity-related phenotypes such as fasting plasma glucose, waist: hip ratio, body mass index and fat mass. Results: Statistical genetic analysis revealed associations between SGIP1 polymorphisms and fat mass (in kilograms) as measured by bioimpedance. SNP genotyping identified associations between several genetic variants and fat mass, with the strongest association for rs2146905 (P=4.7 × 10 -5). A strong allelic effect was noted for several SNPs where fat mass was reduced by up to 9.4% for individuals homozygous for the minor allele. Conclusions: Our results show association between genetic variants in SGIP1 and fat mass. We provide evidence that variation in SGIP1 is a potentially important determinant of obesity-related traits in humans.

    Original languageEnglish (US)
    Pages (from-to)201-206
    Number of pages6
    JournalInternational Journal of Obesity
    Volume36
    Issue number2
    DOIs
    StatePublished - Feb 2012

    Keywords

    • SNP
    • genomics
    • polymorphism

    ASJC Scopus subject areas

    • Medicine (miscellaneous)
    • Endocrinology, Diabetes and Metabolism
    • Nutrition and Dietetics

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