RPA4（replication protein A4），癌症关联基因，基因ID：29935，这个基因编码一个单链dna结合蛋白，它是复制蛋白a复合物的30kda亚单位。复制蛋白a是dna双链断裂修复和细胞周期检测点激活的重要因子。编码蛋白定位于DNA修复灶，可能参与细胞DNA损伤反应这种蛋白质也可能在抑制病毒复制方面发挥作用This gene encodes a single-stranded DNA-binding protein that is the 30-kDa subunit of the replication protein A complex. Replication protein A is an essential factor for DNA double-strand break repair and cell cycle checkpoint activation. The encoded protein localizes to DNA repair foci and may be involved in the cellular DNA damage response. This protein may also play a role in inhibiting viral replication.[provided by RefSeq， Apr 2010]。