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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Analysis of DNA Double-strand Break (DSB) Repair in Mammalian Cells
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Published on: September 8, 2010

RNF4 is required for DNA double-strand break repair in vivo.

R Vyas1, R Kumar, F Clermont

  • 1Center for the Biology of Disease, Laboratory for Molecular Cancer Biology, VIB, Leuven, Belgium.

Cell Death and Differentiation
|December 1, 2012
PubMed
Summary

Rnf4, a ubiquitin ligase, is crucial for DNA double-strand break (DSB) repair by integrating SUMOylation and ubiquitylation. Rnf4 deficiency impairs DNA repair, causing sensitivity to genotoxic stress and reproductive issues.

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Published on: December 23, 2013

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • Unrepaired DNA double-strand breaks (DSBs) lead to genetic instability, cancer, or cell death.
  • Protein SUMOylation and ubiquitylation are vital for dynamic protein complex assembly at DNA damage sites.

Purpose of the Study:

  • To investigate the role of Rnf4, an E3 ubiquitin ligase, in DNA double-strand break (DSB) repair.
  • To elucidate how SUMOylation influences protein ubiquitylation at DSBs and the in vivo function of Rnf4 in the DNA damage response (DDR).

Main Methods:

  • Generated an Rnf4 allelic series in mice to study its role in vivo.
  • Assessed DNA damage, signaling, and sensitivity to genotoxic stress in Rnf4-deficient cells and mice.
  • Investigated the molecular mechanism by which Rnf4 functions in DSB repair, including its targeting of SUMOylated proteins and role in Rad51 loading.

Main Results:

  • Rnf4 accumulates at DSB repair foci and is essential for both homologous recombination (HR) and non-homologous end joining (NHEJ) repair.
  • Rnf4 deficiency results in persistent DNA damage and signaling, increased sensitivity to genotoxic stress, and age-dependent spermatogenesis impairment.
  • Rnf4 targets SUMOylated MDC1 and BRCA1, and is required for Rad51 loading at DNA damage sites.

Conclusions:

  • Rnf4 is a critical component of the DNA damage response (DDR) in vivo.
  • Rnf4 integrates SUMOylation and ubiquitylation events to control protein localization at DNA damage sites, thereby facilitating efficient DNA repair.
  • Rnf4 plays a significant role in maintaining genomic stability and reproductive health.