Transcriptional corepressor. May specifically inhibit gene expression when recruited to promoter regions by sequence-specific DNA-binding proteins such as BCL6. This repression may be mediated at least in part by histone deacetylase activities which can associate with this corepressor. Interacts with PCGF1, forming heterodimers (PubMed:23523425, PubMed:27568929). The PCGF1-BCORL1 heterodimeric complex interacts with the KDM2B-SKP1 heterodimeric complex to form a homotetrameric polycomb repression complex 1 (PRC1.1) (PubMed:27568929). Interacts with CTBP1, HDAC4, HDAC5 and HDAC7 (PubMed:17379597). Detected in testis and prostate. Detected at lower levels in peripheral blood leukocytes and spleen. The disease may be caused by variants affecting the gene represented in this entry. Belongs to the BCOR family. Truncated N-terminus. Truncated N-terminus.