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Critical Reviews™ in Eukaryotic Gene Expression
Fator do impacto: 2.156 FI de cinco anos: 2.255 SJR: 0.649 SNIP: 0.599 CiteScore™: 3

ISSN Imprimir: 1045-4403
ISSN On-line: 2162-6502

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Critical Reviews™ in Eukaryotic Gene Expression

DOI: 10.1615/CritRevEukarGeneExpr.v8.i2.40
pages 169-190

Coactivation and Corepression in Transcriptional Regulation by Steroid/Nuclear Hormone Receptors

J. Don Chen
Department of Pharmacology and Molecular Toxicology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655-0126
Hui Li
Department of Pharmacology and Molecular Toxicology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655-0126

RESUMO

Transcriptional regulation by steroid/nuclear receptors is the central theme of hormone action that controls key aspects of cell differentiation, development, and homeostasis. The molecular mechanisms of gene activation and repression by the receptors have been investigated extensively in recent years. Particularly, several new proteins involved in this signaling pathway have been identified, cloned, and demonstrated to modulate transcription in concert with nuclear receptors. In the absence of hormone, unliganded receptors interact with a family of transcriptional corepressors, including SMRT and N-CoR, which target histone deacetylases to establish a condensed and repressed chromatin structure. Upon hormone binding, the corepressor complex is replaced by a coactivator complex, containing SRC1/TIF2/RAC3 and CBP/p300, which target histone acetyltransferases to generate a transcriptionally accessible chromatin structure. These studies initiate a new era in the history of hormone research and provide novel entry points for understanding the mechanisms of transcriptional regulation by steroid/nuclear receptors.


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