采用4 Gy X射线辐照人乳腺癌细胞MCF-7,分别在照射后0,2,4,8,16,24,48,72和144 h时间点收集细胞,提取DNA并以聚合酶链式反应进行扩增,再以BsaXI限制性内切酶对扩增产物进行消化,消化产物以琼脂糖凝胶电泳进行分离。结果表明,4 Gy X射线辐照可引起D310片段突变,且该突变在经辐照之后144 h检测水平明显超过野生型。
Human breast cancer cell line MCF-7 was irradiated with 4 Gy X-ray,collected at 0,2,4,8,16,24,48,72,144 h after irradiation,respectively.Whole genome DNA including mtDNA were extracted at each time point,and amplified by polymerase chain reaction(PCR).Then the PCR product was subjected to BSAXI digestion,all of digestion product then underwent a brief electrophoresis.Results showed D310 mutation can be induced by 4 Gy X-ray irradiation and D310 mutation can overwhelm the normal phenotype 144 h after irradiation.