Abstract
Two major α-glucosidase (maltase) genes, sucrase-isomaltase (SI) and maltase-glucoamylase (MGAM), respectively, are expressed in the small intestine. In this review, we have summarized whether jejunal expression of these maltase genes is regulated by dietary manipulations, which may affect carbohydrate availability from the luminal side, through changes in the binding of transcription factors and/or histone code on these genes. Studies using a model of mice fed either a low-starch or a high-starch diet for 7 days, found the mRNA levels of SI, MGAM, and Na-glucose cotransporter (SGLT1) genes in the jejunum to be increased in parallel by feeding a high-starch diet. Chromatin immunoprecipitation assays, using jejunal tissue of mice and rats fed a high-starch diet, revealed that the diet increased the acetylations of histones H3 and H4, bindings of coactivators, including general control of amino acid synthesis (GCN5) and the transcriptional factors, including caudal-related homeobox 2 (CDX2), and hepatocyte nuclear factor 1 (HNF1), not only in the promoter/enhancer regions, but also in the transcribed regions of SI and MGAM genes. Feeding rats a diet rich in resistant starch led to a concomitant reduction of mRNA levels of the MGA...Continue Reading
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