Nuclear receptor corepressor 2 (NCOR2)

Nuclear receptor corepressor 2 (NCOR2), also known as SMRT (Silencing Mediator of Retinoic Acid and Thyroid Hormone Receptor), is a pivotal transcriptional corepressor that regulates gene silencing by recruiting chromatin-modifying complexes, notably histone deacetylases (HDACs), to nuclear hormone receptor targets[1][2]. In the absence of ligand, NCOR2 complexes with various nuclear receptors (including retinoic acid and thyroid hormone receptors) and other transcription factors, altering chromatin structure to inhibit transcription. NCOR2 is structurally defined by SANT/Myb domains that mediate these interactions and enable recruitment of chromatin modifiers, like HDAC3, to facilitate transcriptional silencing. Aberrant expression, alternative splicing, or genetic rearrangements of NCOR2 are implicated in several cancers, most notably in the development of resistance to hormone therapies such as tamoxifen in breast cancer. Beyond cancer, NCOR2 helps regulate immune cell differentiation, metabolic pathways, and global cellular transcriptional balance[1][2][3].

Other names

SMRTSMRTEN-CoR2TRACTRAC-1CTG26TNRC14SMAP270Silencing mediator of retinoic acid and thyroid hormone receptorT3 receptor-associating factorThyroid-, retinoic-acid-receptor-associated corepressorSMRTE-tau

Corepressor recruitment to nuclear hormone receptors in absence of ligand, resulting in histone deacetylation and transcriptional silencing Modulation of response to hormone antagonists (e.g., tamoxifen) via competition with coactivators[1][2]