Single-stranded oligonucleotide-mediated gene repair in mammalian cells has a mechanism distinct from homologous recombination repair

Biochem Biophys Res Commun. 2006 Nov 24;350(3):568-73. doi: 10.1016/j.bbrc.2006.09.078. Epub 2006 Sep 26.

Abstract

Single-stranded DNA oligonucleotide (SSO)-mediated gene repair has great potentials for gene therapy and functional genomic studies. However, its underlying mechanism remains unclear. Previous studies from other groups have suggested that DNA damage response via the ATM/ATR pathway may be involved in this process. In this study, we measured the effect of two ATM/ATR inhibitors caffeine and pentoxifylline on the correction efficiency in SSO-mediated gene repair. We also checked their effect on double-stranded break (DSB)-induced homologous recombination repair (HRR) as a control, which is well known to be dependent on the ATM/ATR pathway. We found these inhibitors could completely inhibit DSB-induced HRR, but could only partially inhibit SSO-mediated process, indicating SSO-mediated gene repair is not dependent on the ATM/ATR pathway. Furthermore, we found that thymidine treatment promotes SSO-mediated gene repair, but inhibits DSB-induced HRR. Collectively, our results demonstrate that SSO-mediated and DSB-induced gene repairs have distinct mechanisms.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line
  • DNA Breaks, Single-Stranded*
  • DNA Repair / physiology*
  • DNA, Single-Stranded / metabolism*
  • DNA-Binding Proteins / metabolism*
  • HeLa Cells
  • Humans
  • Kidney / physiology*
  • Recombination, Genetic / physiology*

Substances

  • DNA, Single-Stranded
  • DNA-Binding Proteins