這個基因的產物是檢查點激酶1的一個重要上游調節因子，并觸發細胞周期的檢查點阻滯，以應對復制應激或dna損傷。在正常的s期，這種蛋白質也是有效的dna復制所必需的。已發現該基因編碼不同亞型的多個轉錄變體。[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]