›› 2011, Vol. 23 ›› Issue (6): 406-409.doi: 10.3969/j.issn.1004-616x.2011.06.001

• 核辐射安全专家论坛 • 上一篇    下一篇

同源重组修复基因 RAD51可提高PTEN 缺失细胞基因组稳定性

陈忠民,徐勤枝,胡迎春,霍艳英,周平坤,吴德昌   

  1. 1. 军事医学科学院放射与辐射医学研究所,北京 100850;2. 中国人民解放军第二炮兵防疫中心,北京 100071
  • 收稿日期:2011-09-19 修回日期:2011-10-20 出版日期:2011-11-30 发布日期:2011-11-30
  • 通讯作者: 徐勤枝

Homologous recombination repair gene RAD51 could increase the genomic stability of PTEN deleted cells

CHEN Zhong-min,XU Qin-zhi,HU Ying-chun,HUO Yan-ying,ZHOU Ping-kun,WU De-chang   

  1. 1. Institute of Radiation Medicine, Academy of Military Medical Science, Beijing 100850; 2. Center for Disease Control And Prevention, Second Artillery Force of PLA, Beijing 100071, China
  • Received:2011-09-19 Revised:2011-10-20 Online:2011-11-30 Published:2011-11-30
  • Contact: XU Qin-zhi

摘要: 目的: 研究同源重组修复基因RAD51对PTEN缺失小鼠胚胎成纤维细胞基因组稳定性的影响。方法:应用免疫荧光和中性单细胞电泳技术观察PTEN缺失后自发性和辐射诱导DNA双链断裂情况;并构建PTEN缺失细胞稳定转染RAD51的细胞系,γ射线照射后检测细胞存活率。结果:PTEN缺失导致细胞自发性和辐射诱导DNA双链断裂增多;转染RAD51后细胞存活率增高,辐射诱导的DNA双链断裂减少。结论:同源重组修复基因RAD51可以提高PTEN缺失细胞基因组稳定性。

关键词: PTEN, RAD51, 基因组稳定性

Abstract: OBJECTIVE: To explore the effect of genomic stability of PTEN-deficient mice embryonic fibroblasts after transfection with RAD51,an important homologous recombination repair gene. METHODS: Immunofluorescence assay was used to observe the number of spontaneous γ-H2AX foci. Neutral single cell gel electrophoresis was applied to detect spontaneous and radiation-induced DNA double-strand breaks in both PTEN-deficient and PTEN wild-type cells. RESULTS:PTEN deletion led to an increase of spontaneous γ-H2AX foci and the length of tail moment, indicating DNA double-strand breaks. Transfection with RAD51 increased cell survival and decreased radiation-induced DNA double-strand breaks of PTEN-deficient cells. CONCLUSION:Homologous recombination gene RAD51 could increase genomic stability of PTEN-deficient cells.

Key words: PTEN, RAD51, genomic stability