Human Molecular Genetics Advance Access originally published online on August 7, 2006
Human Molecular Genetics 2006 15(18):2709-2720; doi:10.1093/hmg/ddl204
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TBC1D1 is a candidate for a severe obesity gene and evidence for a gene/gene interaction in obesity predisposition
1 Myriad Genetics, Inc., Salt Lake City, 320 Wakara Way, UT 84108, USA, 2 Department of Psychiatry, Genome Research Institute, University of Cincinnati, OH 45237, USA, 3 Cardiovascular Research and Training Institute, University of Utah, Salt Lake City, UT 84112, USA and 4 Cardiovascular Genetics, Department of Medicine, University of Utah, Salt Lake City, UT 84108, USA
* To whom correspondence should be addressed. Tel: +1 8015843695; Fax: +1 8015843640; Email: sstone{at}myriad.com
Received June 8, 2006; Accepted July 28, 2006
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.
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