title: Cell death caused by single-stranded oligodeoxynucleotide-mediated targeted genomic sequence modification.
abstract: Targeted gene repair directed by single-stranded oligodeoxynucleotides (ssODNs) offers a promising tool for biotechnology and gene therapy. However, the methodology is currently limited by its low frequency of repair events, variability, and low viability of "corrected" cells. In this study, we showed that during ssODN-mediated gene repair reaction, a significant population of corrected cells failed to divide, and were much more prone to undergo apoptosis, as marked by processing of caspases and PARP-1. In addition, we found that apoptotic cell death triggered by ssODN-mediated gene repair was largely independent of the ATM/ATR kinase. Furthermore, we examined the potential involvement of the mismatch repair (MMR) proteins in this "correction reaction-induced" cell death. Result showed that while defective MMR greatly enhanced the efficiency of gene correction, compromising the MMR system did not yield any viable corrected clone, indicating that the MMR machinery, although plays a critical role in determining ssODN-directed repair, was not involved in the observed cellular genotoxic responses.
authors: Department of Biochemistry, The University of Hong Kong, Hong Kong SAR, People's Republic of China.
authors: Chenli
authors: C
authors: Liu
authors: Zai
authors: Z
authors: Wang
authors: Michael S Y
authors: MS
authors: Huen
authors: Lin-Yu
authors: LY
authors: Lu
authors: De-Pei
authors: DP
authors: Liu
authors: Jian-Dong
authors: JD
authors: Huang
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D017209:Apoptosis / Q000235:genetics / Q000502:physiology*; D064007:Ataxia Telangiectasia Mutated Proteins; D002104:Cadmium / Q000494:pharmacology; D020169:Caspases / Q000378:metabolism; D018797:Cell Cycle Proteins / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects / Q000502:physiology; D053843:DNA Mismatch Repair / Q000235:genetics / Q000502:physiology*; D004277:DNA, Single-Stranded / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism; D018390:Gene Targeting; D006367:HeLa Cells; D006801:Humans; D000070957:MutL Protein Homolog 1; D009687:Nuclear Proteins / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D016376:Oligonucleotides, Antisense / Q000235:genetics / Q000378:metabolism*; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D014162:Transfection; D025521:Tumor Suppressor Proteins / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D018797:Cell Cycle Proteins; D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins; C501486:MLH1 protein, human; D009687:Nuclear Proteins; D016376:Oligonucleotides, Antisense; D025521:Tumor Suppressor Proteins; D002104:Cadmium; C499320:PARP1 protein, human; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases; C576324:ATM protein, human; C576597:ATR protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; D017346:Protein Serine-Threonine Kinases; D020169:Caspases; D000070957:MutL Protein Homolog 1