ArticleMolecular and cellular biology2003
Occupancy and function of the -150 sterol regulatory element and -65 E-box in nutritional regulation of the fatty acid synthase gene in living animals.
Article in Molecular and cellular biology, 2003. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers.
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38 citing papers in PubMed, 107 citations in OpenAlex.
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- Role of BAF60a/BAF60c in chromatin remodeling and hepatic lipid metabolism.Nutrition & metabolism · 2016Review
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
Abstract
Upstream regulatory factor (USF) and sterol regulatory element binding protein (SREBP) play key roles in the transcriptional regulation of the fatty acid synthase (FAS) gene by feeding and insulin. Due to the dual binding specificity of SREBP, as well as the presence of multiple consensus sites for these transcription factors in the FAS promoter, their physiologically relevant functional binding sites have been controversial. Here, in order to determine the occupancy of the putative USF and SREBP binding sites, we examined their protein-DNA interactions in living animals by using formaldehyde cross-linking and immunoprecipitation of chromatin and tested the function of these elements by employing mice transgenic for a reporter gene driven by various 5' deletions as well as site-specific mutations of the FAS promoter. We show that the -332 and -65 E-boxes are bound by USF in both fasted and refed mice, while the -150 SRE is bound by SREBP-1 only in refed mice. We also found that mutation of either the -150 SRE or the -65 E-box abolishes the feeding-induced activation of the FAS promoter in transgenic mice. Furthermore, in vivo occupancy of the FAS promoter by SREBP in the fed state can be prevented by mutation not only of the -150 SRE but, unexpectedly, of the -65 E-box as well. We conclude that the FAS promoter is activated during refeeding via the induced binding of SREBP to the -150 SRE and that USF binding to the -65 E-box is also required for SREBP binding and activation of the FAS promoter.
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