F.W. Turek et al., "Obesity and metabolic syndrome in circadian Clock mutant mice." Science, 308:1043, 2005. (Cited in 90 papers)
Joe Bass and others at Northwestern University found that mice with a mutated Clock gene showed both abnormal circadian rhythms and feeding behavior. Metabolic problems included obesity and abnormally high levels of blood cholesterol.
Circadian variation in insulin secretion and action has long been recognized, says Bass, professor at Evanston Northwestern Healthcare. "What's changed is we now have a new molecular window on pathways that give rise to the observed circadian characteristics in the regulation of glucose homeostasis."
Colleen McClung, a circadian researcher at the University of Texas Southwestern Medical Center, Dallas, writes via E-mail that she was struck by "the broad range of metabolic phenotypes that are present in the Clock mutants ... It will be interesting to determine how...
|Energy Intake (kcal/wk)||Body weight (g)|
|Wild-type mice (regular diet)||84.1||29.5|
|Clock mice (regular diet)||91.8||33.8|
|Wild-type mice (high-fat diet)||92.4||32.1|
|Clock mice (high-fat diet)||105.4||40.3|