這個基因編碼DNA損傷檢查點的一個重要組成部分。編碼的蛋白質結合到具有復制蛋白A的單鏈DNA上。該蛋白質還與共濟失調毛細血管擴張癥和RAD3相關蛋白激酶相互作用，導致其在DNA損傷引起的核內聚集。已發現該基因編碼不同亞型的多個轉錄變體。[由RefSeq提供，2012年8月]
This gene encodes an essential component of the DNA damage checkpoint. The encoded protein binds to single-stranded DNA coated with replication protein A. The protein also interacts with the ataxia telangiectasia and Rad3 related protein kinase, resulting in its accumulation at intranuclear foci induced by DNA damage. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2012]