Induced Pluripotent Stem Cells Are Sensitive to DNA Damage  

作　　者：Minjie Zhang Caiyun Yang Huixian Liu Yingli Sun 

机构地区：[1]Beijing Institute of Genomics,Chinese Academy of Sciences

出　　处：《Genomics, Proteomics & Bioinformatics》2013年第5期320-326,共7页基因组蛋白质组与生物信息学报（英文版）

基　　金：supported by Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA01040405);National Natural Science Foundation of China(Grant No.91029024);National Basic Research Program of China(973 Program;Grant No.2013CB911001)

摘　　要：Induced pluripotent stem cells （iPSCs） resemble embryonic stem cells （ESCs） in morphol- ogy, gene expression and in vitro differentiation, raising new hope for personalized clinical therapy. While many efforts have been made to improve reprogramming efficiency, significant problems such as genomic instability of iPSCs need to be addressed before clinical therapy. In this study, we try to figure out the real genomic state of iPSCs and their DNA damage response to ionizing radiation （IR）. We found that iPSC line 3FB4-1 had lower DNA damage repair ability than mouse embryonic fibroblast （MEF） cells, from which 3FB4-11ine was derived. After the introduction of DNA damage by IR, the number of 7-H2AX loci in 3FB4-1 increased modestly compared to a large increase seen in MEF, albeit both significantly （P 〈 0.01）. In addition, whole-genome sequencing analysis showed that after IR, 3FB4-1 possessed more point mutations than MEF and the point mutations spread all over chromosomes. These observations provide evidence that iPSCs are more sensitive to ionizing radiation and their relatively low DNA damage repair capacity may account for their high radiosensitivity. The compromised DNA damage repair capacity of iPSCs should be considered when used in clinical therapy.Induced pluripotent stem cells （iPSCs） resemble embryonic stem cells （ESCs） in morphol- ogy, gene expression and in vitro differentiation, raising new hope for personalized clinical therapy. While many efforts have been made to improve reprogramming efficiency, significant problems such as genomic instability of iPSCs need to be addressed before clinical therapy. In this study, we try to figure out the real genomic state of iPSCs and their DNA damage response to ionizing radiation （IR）. We found that iPSC line 3FB4-1 had lower DNA damage repair ability than mouse embryonic fibroblast （MEF） cells, from which 3FB4-11ine was derived. After the introduction of DNA damage by IR, the number of 7-H2AX loci in 3FB4-1 increased modestly compared to a large increase seen in MEF, albeit both significantly （P 〈 0.01）. In addition, whole-genome sequencing analysis showed that after IR, 3FB4-1 possessed more point mutations than MEF and the point mutations spread all over chromosomes. These observations provide evidence that iPSCs are more sensitive to ionizing radiation and their relatively low DNA damage repair capacity may account for their high radiosensitivity. The compromised DNA damage repair capacity of iPSCs should be considered when used in clinical therapy.

关 键 词：IPSCS MEF cells Γ-H2AX DNA damage Whole-genome sequencing 

分 类 号：R329[医药卫生—人体解剖和组织胚胎学]