Breast carcinoma amplified sequence 3, also known as BCAS3, is a protein which in humans is encoded by the BCAS3gene. BCAS3 is a gene that is amplified and overexpressed in breast cancer cells.
The BCAS3 gene is regulated by estrogen receptor alpha (ER-α). The PELP1 protein acts as a transcriptional coactivator of estrogen receptor induced BCAS3 gene expression. In addition BCAS3 possesses histone acetyltransferase activity and itself appears to act as a coactivator of ER-α. Furthermore, BCAS3 requires PELP1 to function as a coactivator in ER-α. Hence BCAS3 apparently is involved in a positive feedback loop leading to ER-α mediated signal amplification.
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Bärlund M, Monni O, Weaver JD, et al. (2003). "Cloning of BCAS3 (17q23) and BCAS4 (20q13) genes that undergo amplification, overexpression, and fusion in breast cancer". Genes Chromosomes Cancer. 35 (4): 311–7. doi:10.1002/gcc.10121. PMID12378525.
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Gururaj AE, Peng S, Vadlamudi RK, Kumar R (2007). "Estrogen induces expression of BCAS3, a novel estrogen receptor-alpha coactivator, through proline-, glutamic acid-, and leucine-rich protein-1 (PELP1)". Mol. Endocrinol. 21 (8): 1847–60. doi:10.1210/me.2006-0514. PMID17505058.