NCOA3（nuclear receptor coactivator 3），癌症关联基因，基因ID：8202，该基因编码的蛋白是一种与核激素受体相互作用以增强其转录激活功能的核受体辅活化子。编码蛋白具有组蛋白乙酰转移酶活性，并招募p300/cbp相关因子和creb结合蛋白作为多亚单位协同激活复合物的一部分。这种蛋白质最初在细胞质中发现，但在磷酸化后转移到细胞核中。一些转录变体编码不同的亚型已被发现的这个基因。此外，在编码蛋白的C末端发现一个多态重复区。The protein encoded by this gene is a nuclear receptor coactivator that interacts with nuclear hormone receptors to enhance their transcriptional activator functions. The encoded protein has histone acetyltransferase activity and recruits p300/CBP-associated factor and CREB binding protein as part of a multisubunit coactivation complex. This protein is initially found in the cytoplasm but is translocated into the nucleus upon phosphorylation. Several transcript variants encoding different isoforms have been found for this gene. In addition， a polymorphic repeat region is found in the C-terminus of the encoded protein.关联癌症：乳腺癌。