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Bindings of ChREBP and SREBP1, and histone acetylation around the rat liver fatty acid synthase gene are associated with induction of the gene during the suckling-weaning transition.

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Department of Health and Nutritional Sciences, Faculty of Health Promotional Sciences, Hamamatsu University.


It has been reported that the enzymic activity of fatty acid synthase (Fas) in rat liver increases during suckling-weaning transition. In this study, we investigated whether induction of the gene (Fasn) in the rat liver during the suckling-weaning transition is regulated by histone acetylation, and the nuclear transcription factors carbohydrate response element-binding protein (ChREBP) and sterol regulatory element-binding protein 1 (SREBP1). We observed that levels of Fas and Fasn increased during suckling-weaning transition. Binding levels of ChREBP and SREBP1 to upstream regions of Fasn increased during the suckling-weaning transition. Acetylation of histones H3 and H4 around Fasn increased during the transient period. Our results suggest that induction of liver Fasn during the suckling-weaning transition is closely associated with increased levels of ChREBP and SREBP1 binding, and acetylation of histones H3 and H4 around the gene.

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