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Body weight influenced by thousands of genes

PHILADELPHIA (January 14, 2008) Reporting in the online journal BMC Genetics, researchers from the Monell Center have for the first time attempted to count the number of genes that contribute to obesity and body weight.

The findings suggest that over 6,000 genes about 25 percent of the genome help determine an individuals body weight.

Reports describing the discovery of a new obesity gene have become common in the scientific literature and also the popular press, notes Monell behavioral geneticist Michael G. Tordoff, PhD, an author on the study.

Our results suggest that each newly discovered gene is just one of the many thousands that influence body weight, so a quick fix to the obesity problem is unlikely.

To obtain an estimate of how many genes contribute to body weight, the Monell researchers surveyed the Jackson Laboratory Mouse Genome Database for information on body weights of knockout mouse strains.

Knockout mice have had a specific gene inactivated, or "knocked out. By studying how the knockout mice differ from normal mice, researchers obtain information about that genes function and how it might contribute to disease. Mice can provide valuable information on human disease because they share many genes with humans.

The knockout approach is so useful that the inventors of the technology were awarded the 2007 Nobel Prize in Medicine. Knockout mice are now standard tools in all mouse models of behavior and disease.

In 60% of strains, knocking out a gene produces mice that are nonviable; that is, the mouse cannot survive without the knocked out gene.

The Monell survey revealed that body weight was altered in over a third of the viable knockout stains; 31 percent weighed less than controls (indicating that the missing genes contribute to heavier body weight), while another 3 percent weighed more (contributing to lighter weight).

Extrapolating from the total number

Contact: Leslie Stein
Monell Chemical Senses Center

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