Cell cycle checkpoint control protein RAD9B (RAD9B)

Cell cycle checkpoint control protein RAD9B (RAD9B) is a conserved DNA damage response protein implicated in cell cycle checkpoint control, DNA repair, apoptosis regulation, and embryonic neural development[1][2][3]. RAD9B acts as a component of the 9-1-1 checkpoint clamp, a heterotrimeric complex (with RAD1 and HUS1) that is loaded onto DNA at damage sites, analogous to the PCNA sliding clamp, and participates in recruiting repair and signaling factors[1][4]. Unlike its paralogue RAD9A, RAD9B is predominantly expressed in the testis and brain, has distinct nucleolar stress response signaling via ATR and JNK, modulates the timing of cell cycle progression in G1, and is vital for embryonic viability and proper neural tube morphogenesis[1][2][3]. Genetic aberrations in RAD9B are associated with increased sensitivity to certain genotoxic agents and implicated in neural tube defects and testicular tumorigenesis. No direct therapeutic agents currently target RAD9B, but its biomarker potential and fundamental role in genomic integrity make it of translational interest in oncology and developmental biology[1][2][3].

Other names

RAD9BCell cycle checkpoint control protein RAD9BhRAD9BFLJ40346DNA repair exonuclease rad9 homolog BRAD9 homolog B