H2BC1 (Histone H2B type 1-C/E/F/G/I) is a gene that encodes a protein in the histone H2B family, which is essential for packaging DNA into chromatin within eukaryotic cell nuclei. Histones such as H2B play a crucial role in regulating gene expression by controlling DNA access to transcription factors and related machinery. Specifically, H2BC1 helps form the nucleosome core, where H2B proteins combine with histones H2A, H3, and H4 to create an octameric complex around which DNA is wrapped.