PBRM1 (Polybromo 1): PBRM1 is a subunit of the SWI/SNF chromatin remodeling complex that helps regulate gene expression by modifying chromatin structure. It functions as a tumor suppressor, and mutations in PBRM1 have been associated with various cancers, particularly clear cell renal cell carcinoma. Its role in chromatin remodeling is crucial for maintaining genomic integrity and supporting normal cell function.