CHEK1（checkpoint kinase 1），癌症关联基因，基因ID：1111，该基因编码的蛋白属于SER/THR蛋白激酶家族。在DNA损伤或存在未复制的DNA时，检测点介导的细胞周期停滞是必需的。这种蛋白的作用是整合来自atm和atr的信号，atr是两种参与DNA损伤反应的细胞周期蛋白，在减数分裂前期也与染色质有关。CDC25A蛋白磷酸酶被这种蛋白磷酸化是细胞延迟细胞周期进程以响应双链DNA断裂所必需的。一些选择性剪接的转录变体已经被发现为这个基因。The protein encoded by this gene belongs to the Ser/Thr protein kinase family. It is required for checkpoint mediated cell cycle arrest in response to DNA damage or the presence of unreplicated DNA. This protein acts to integrate signals from ATM and ATR， two cell cycle proteins involved in DNA damage responses， that also associate with chromatin in meiotic prophase I. Phosphorylation of CDC25A protein phosphatase by this protein is required for cells to delay cell cycle progression in response to double-strand DNA breaks. Several alternatively spliced transcript variants have been found for this gene.关联癌症：小细胞肺癌。关联化疗药物：奥拉帕利，奥拉帕尼，Prexasertib。