Journal Article

TBC1D1 is a candidate for a severe obesity gene and evidence for a gene/gene interaction in obesity predisposition

Steven Stone, Victor Abkevich, Deanna L. Russell, Robyn Riley, Kirsten Timms, Thanh Tran, Deborah Trem, David Frank, Srikanth Jammulapati, Chris D. Neff, Diana Iliev, Richard Gress, Gongping He, Georges C. Frech, Ted D. Adams, Mark H. Skolnick, Jerry S. Lanchbury, Alexander Gutin, Steven C. Hunt and Donna Shattuck

in Human Molecular Genetics

Volume 15, issue 18, pages 2709-2720
Published in print September 2006 | ISSN: 0964-6906
Published online August 2006 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddl204
TBC1D1 is a candidate for a severe obesity gene and evidence for a gene/gene interaction in obesity predisposition

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The molecular etiology of obesity predisposition is largely unknown. Here, we present evidence that genetic variation in TBC1D1 confers risk for severe obesity in females. We identified a coding variant (R125W) in TBC1D1 that segregated with the disease in 4p15–14-linked obesity pedigrees. In cases derived from pedigrees with the strongest linkage evidence, the variant was significantly associated with obesity (P=0.000007) and chromosomes carrying R125W accounted for the majority of the evidence that originally linked 4p15–14 with the disease. In addition, by selecting families that segregated R125W with obesity, we were able to generate highly significant linkage evidence for an obesity predisposition locus at 4q34–35. This result provides additional and confirming evidence that R125W affects obesity susceptibility, delimits the location of an obesity gene at 4q34–35 and identifies a gene/gene interaction that influences the risk for obesity predisposition. Finally, although the function of TBC1D1 is unknown, the protein is structurally similar to a known regulator of insulin-mediated Glut4 translocation.

Journal Article.  7043 words.  Illustrated.

Subjects: Genetics and Genomics

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