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Physiol. Genomics 27: 264-270, 2006. First published August 15, 2006; doi:10.1152/physiolgenomics.00225.2005
1094-8341/06 $8.00
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Received 6 September 2005; accepted in final form 1 August 2006.
Physiological Genomics 27:264-270 (2006)
1094-8341/06 $8.00 © 2006 American Physiological Society

Genetic, sex, and diet effects on body weight and obesity in the Berlin Fat Mouse Inbred lines

Asja Wagener, Armin O. Schmitt, Soner Aksu, Werner Schlote, Christina Neuschl and Gudrun A. Brockmann

Institute of Animal Sciences, Humboldt-Universität zu Berlin, Berlin, Germany

Mouse lines long-term selected for high fatness offer the possibility to identify individual genes involved in the development of obesity. The Berlin Fat Mouse (BFM) line has been selected for low protein content and afterward for high fatness. Three Berlin Fat Mouse Inbred (BFMI) lines, which are derivates of the selection line BFM and an unselected control line (C57BL/6; B6) were systematically phenotyped between 3 and 20 wk. The body weights and body compositions were measured on a weekly basis. We demonstrated that the BFMI lines dispose of more body weight, body fat mass, and body lean mass than the control line B6 because of a better feed efficiency in these lines. In contrast to other growth-selected mouse lines, the BFMI lines exhibited a general increase in body fat mass but only a marginal increase in body lean mass. The three BFMI lines also showed line- and sex-specific patterns and varied in their response to high-fat diet. The phenotypic differences between the BFMI lines can be traced back to different sets of fixed alleles contributing to fat accumulation and diet-induced obesity. Our results demonstrate that the genetically related BFMI lines are novel models to study the genetic as well as the nutritional aspects of obesity.

selection; inbreeding; fat distribution; growth; adiposity






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