Histone H2A-Bbd type 2 (H2A.B (or H2A.Bbd))

Histone H2A-Bbd type 2 (H2A.B or H2AB2) is a variant of the core histone H2A family, featuring sequence divergence in its C- and N-terminal regions. H2A.B variants are incorporated into nucleosomes to modulate chromatin structure, generally resulting in more open and dynamic chromatin configurations that promote gene activation. H2A.B exhibits highest expression in testes and to a lesser extent in the brain and other tissues. It functions as an activator of gene transcription and pre-mRNA splicing and directly promotes ribosome biogenesis by stimulating rRNA and ribosomal protein gene transcription. H2A.B variants have distinctive posttranslational modifications, such as arginine methylation and phosphorylation, that influence their chromatin localization and protein interaction networks. Increased H2A.B expression is associated with enhanced proliferation in cancer cells, and its depletion reduces tumor cell growth, indicating a potential role in oncogenic processes. Currently, H2A.B is not a direct therapeutic target, and no drugs or specific safety concerns are reported for it[1][3].

Other names

H2AB2H2AFB2H2ABBDH2AFBH2AFB3H2A.BbdH2A.B.1H2A Barr body-deficientH2AB3histone H2A-Bbd type 2/3H2A Barr body deficientH2A histone family member B2