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Dartmouth researchers zero-in on a gene that heightens muscle performance

in turn, raises many questions about possible modes of exercise performance enhancement, including the development of drugs that could do the same thing as we have done genetically," he says. "This also might raise to some the specter of 'gene doping,' something seriously being talked about in the future of high-performance athletes."

Witters says that the carbohydrate, glucose, is a major fuel that powers muscles, and this contributes directly to a muscle's ability to repetitively contract during exercise. The activated AMPK in the Dartmouth mouse appears to have increased glycogen content by actually switching on a gene that normally synthesizes liver glycogen.

"The switching on of this liver gene in muscles," he says, "is a shift in the conception of the biochemistry of muscle metabolism, since many enzyme genes are thought to only be active in just one tissue."

Other authors on the paper include Laura Barré, Christine Richardson, and Steven Fiering, all at Dartmouth; Michael Hirshman and Laurie Goodyear of Joslin Diabetes Center in Boston; Joseph Brozinick with Eli Lilly and Company; and Bruce Kemp of the St. Vincent's Institute in Australia.

This research is funded by the National Institutes of Health.



Source-Eurekalert
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