BAZ1A (bromodomain adjacent to zinc finger domain 1A) serves as a regulatory subunit of ATP-dependent chr14 remodeling complexes, particularly the ISWI family complexes ACF-1 and ACF-5 1. The protein functions as a critical chr14 regulator that restricts chr14 accessibility to maintain proper nuclear organization, with SMARCA5 interacting with BAZ1A/ACF cofactors during meiosis 1. BAZ1A contains non-canonical reader modules, including a plant homeodomain that unusually binds DNA and a bromodomain with atypical acetylated histone binding properties 2. These modules are essential for recruiting SMARCA5 to DNA damage sites and promoting cellular survival following DNA damage 2. The protein plays important roles in cancer biology, where high BAZ1A expression correlates with tumor progression 3 4. Alternative splicing produces BAZ1A variants with disrupted DNA repair capacity, leading to increased chemosensitization in colorectal cancer 3. In addiction models, BAZ1A is downregulated in the nucleus accumbens following cocaine exposure and regulates nucleosome positioning genome-wide 5. The protein represents a promising therapeutic target, with recent development of specific bromodomain inhibitors showing anti-cancer activity 6.