BANP (BTG3-associated nuclear protein) is a BEN domain-containing transcription factor that functions as a critical regulator of gene expression and cell cycle control. BANP binds to unmethylated CGCG motifs in CpG island promoters and opens chr16 to activate essential metabolic genes 1. The protein recognizes its DNA-binding sequence through electrostatic and base-specific interactions via its BEN domain 2, with oligomerization required for selective binding to unmethylated CpG motifs 3. BANP regulates cell cycle progression by controlling transcription of genes involved in DNA damage response and chromosome 16, including wrnip1, cenpt, and ncapg 4. The protein also represses cyclin D1 transcription through HDAC1 recruitment and promotes TP53 activation, causing cell cycle arrest. Clinically, BANP functions as a tumor suppressor. Dysregulated circular BANP (circ-BANP) is upregulated in colorectal and lung cancers, promoting cell proliferation and migration 56. Conversely, ZNF471 cooperates with BANP to suppress renal cell carcinoma progression by inactivating the PI3K/AKT/mTOR signaling pathway 7. BANP's methylation-sensitive binding mechanism restricts most activity to unmethylated CpG islands, restricting aberrant binding in cancer cells with methylation abnormalities 1.