title: Negative regulation contributes to tissue specificity of the immunoglobulin heavy-chain enhancer.
abstract: We have identified in and around the immunoglobulin heavy-chain enhancer two apparently distinct negative regulatory elements which repress immunoglobulin H enhancer, simian virus 40 enhancer, and heterologous promoter activity in fibroblasts but not in myeloma cells. We propose that in nonlymphoid cells, negative regulatory elements prevent activation of the immunoglobulin H enhancer by ubiquitous stimulatory trans-acting factors.
mesh_terms: D000818:Animals; D004247:DNA / Q000235:genetics; D004742:Enhancer Elements, Genetic; D005786:Gene Expression Regulation; D005809:Genes, Regulator; D005914:Globins / Q000235:genetics; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D051379:Mice; D011401:Promoter Regions, Genetic; D013539:Simian virus 40 / Q000235:genetics; D014158:Transcription, Genetic
chemical_list: D007143:Immunoglobulin Heavy Chains; D005914:Globins; D004247:DNA