A Gain-of-Function Mutation in Adenylate Cyclase 3 Protects Mice from Diet-Induced Obesity |
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| Authors: | Jeffrey L. Pitman Matthew C. Wheeler David J. Lloyd John R. Walker Richard J. Glynne Nicholas Gekakis |
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| Affiliation: | 1. Department of Cell and Molecular Biology, The Scripps Research Institute, La Jolla, CA, United States of America.; 2. Genomics Institute of the Novartis Research Foundation, San Diego, CA, United States of America.; 3. Donald P. Shiley BioScience Center, San Diego State University, San Diego, CA, United States of America.; University of Texas Health Science Center at Houston, United States of America, |
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| Abstract: | In a screen for genes that affect the metabolic response to high-fat diet (HFD), we selected one line of N-ethyl-N-nitrosourea (ENU)-mutagenized mice, Jll, with dominantly inherited resistance to diet-induced obesity (DIO). Mutant animals had dramatically reduced body weight and fat mass, and low basal insulin and glucose levels relative to unaffected controls. Both white adipose tissue (WAT) and brown adipose tissue (BAT) depots were smaller in mutant animals. Mutant animals fed a HFD gained only slightly more weight than animals fed regular chow, and were protected from hepatic lipid accumulation. The phenotype was genetically linked to a 5.7-Mb interval on chromosome 12, and sequencing of the entire interval identified a single coding mutation, predicted to cause a methionine-to-isoleucine substitution at position 279 of the Adcy3 protein (Adcy3M279I, henceforth referred to as Adcy3Jll). The mutant protein is hyperactive, possibly constitutively so, producing elevated levels of cyclic AMP in a cell-based assay. These mice demonstrate that increased Adcy3 activity robustly protect animals from diet-induced metabolic derangements. |
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