CLSPN（claspin），癌症关联基因，基因ID：63967，这个基因的产物是检查点激酶1的一个重要上游调节因子，并触发细胞周期的检查点阻滞，以应对复制应激或dna损伤。在正常的s期，这种蛋白质也是有效的dna复制所必需的。已发现该基因编码不同亚型的多个转录变体。[由RefSeq提供，2010年6月]The product of this gene is an essential upstream regulator of checkpoint kinase 1 and triggers a checkpoint arrest of the cell cycle in response to replicative stress or DNA damage. The protein is also required for efficient DNA replication during a normal S phase. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq， Jun 2010]。