ATR第10外显子10a单核苷酸的插入或缺失导致密码子I774的移码。在子宫内膜癌患者中,这种突变仅在微卫星不稳定患者中观察到。 Single A insertion or deletion in the 10 A mononucleotide run in exon 10 of ATR results in a frameshift of codon I774. In patients with endometrial cancer, this mutation has only been observed in patients with microsatellite instability.