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Chromodomain helicase DNA-binding protein 2 affects the repair of X-ray and UV-induced DNA damage

Sangeetha Rajagopalan1, Justin Nepa, Sundaresan Venkatachalam

  • 1Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee, USA.

Environmental and Molecular Mutagenesis
|January 7, 2012
PubMed

Insights

Chromodomain helicase DNA-binding protein 2 (Chd2) is crucial for DNA repair in eukaryotic cells. Chd2 mutant mice exhibit increased lymphoid tumors, indicating its role in preventing DNA damage-induced mutations.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Eukaryotic cells possess redundant DNA damage response pathways to prevent mutations.
  • Mechanisms of DNA damage recognition, repair, and signaling within chromatin remain poorly understood.
  • Chromodomain helicase DNA-binding proteins (CHD) are conserved chromatin remodelers involved in transcription regulation.

Purpose of the Study:

  • To investigate the physiological role of a CHD member, Chd2, in a mammalian model.
  • To elucidate the involvement of Chd2 in DNA damage response pathways.

Main Methods:

  • Development of a Chd2 mutant mouse model.
  • Assessment of DNA repair capacity in Chd2 mutant cells following ionizing and ultraviolet radiation exposure.
  • Clonogenic assays to evaluate sensitivity to DNA damaging agents.

Main Results:

  • Chd2 mutant mice display high susceptibility to spontaneous lymphoid tumor formation.
  • Chd2 mutant cells show impaired DNA repair following exposure to ionizing and ultraviolet radiation.
  • Chd2 mutant cells are sensitive to DNA damaging agents in clonogenic assays.

Conclusions:

  • The study suggests Chd2 protein plays a significant role in regulating DNA damage responses.
  • Chd2 functions at the chromatin level to maintain genomic stability.
  • Defects in Chd2-mediated DNA damage response contribute to lymphoid tumor development.

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