title: Repression of insulin gene expression by adenovirus type 5 E1a proteins.
abstract: Insulin gene transcription relies on enhancer and promoter elements which are active in pancreatic beta cells. We showed that adenovirus type 5 infection of HIT T-15 cells, a transformed hamster beta cell line, represses insulin gene transcription and mRNA levels. Using expression plasmids transiently introduced into HIT T-15 cells, we showed that adenovirus type 5 E1a transcription regulatory proteins repress insulin enhancer-promoter element activity as assayed with a surrogate xanthine-guanine phosphoribosyltransferase gene. We relate E1a repression of the insulin gene to other examples of repression of enhancer-dependent genes by E1a and discuss the possible relationship of this repression to insulin gene regulation.
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D017456:Adenovirus Early Proteins; D000818:Animals; D002460:Cell Line; D006224:Cricetinae; D004742:Enhancer Elements, Genetic; D005786:Gene Expression Regulation; D007328:Insulin / Q000235:genetics*; D007515:Islets of Langerhans / Q000378:metabolism; D009856:Oncogene Proteins, Viral / Q000235:genetics*; D010957:Plasmids; D011401:Promoter Regions, Genetic; D012097:Repressor Proteins / Q000235:genetics
chemical_list: D017456:Adenovirus Early Proteins; D007328:Insulin; D009856:Oncogene Proteins, Viral; D012097:Repressor Proteins