Clock genes respond to external stimuli and exhibit circadian rhythms. This study
investigated the expression of clock genes in the small intestine and their contribution in the
regulation of nutrient absorption by enterocytes. We examined expression of clock genes
and macronutrient transport proteins in the small intestines of wild-type and Clock mutant
(Clk mt/mt) mice with free or limited access to food. In addition, we studied absorption of
macronutrients in these mice. Intestinal clock genes show circadian expression and respond …