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Visualization of DNA Repair Proteins Interaction by Immunofluorescence
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Published on: June 26, 2020

Msl2 is a novel component of the vertebrate DNA damage response

Zheng Lai1, Simona Moravcová, Yvan Canitrot

  • 1Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland, Galway, University Road, Galway, Ireland.

Plos One
|July 23, 2013
PubMed

Insights

The male-specific lethal 2 (MSL2) protein, a ubiquitin ligase, is crucial for DNA repair. Disrupting MSL2 impairs non-homologous end joining (NHEJ) and alters histone modifications following DNA damage.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The male-specific lethal 2 (MSL2) protein is a RING finger E3 ubiquitin ligase.
  • Its precise functions in transcription regulation and apoptosis are not fully understood.
  • MSL2's role in DNA damage response pathways requires further investigation.

Purpose of the Study:

  • To elucidate the function of MSL2 in cellular processes, particularly DNA damage response.
  • To characterize the impact of MSL2 disruption on chromatin and DNA repair mechanisms.
  • To identify novel substrates and interacting partners of MSL2 in DNA repair.

Main Methods:

  • Gene disruption of Msl2 in chicken DT40 cells.
  • Biochemical analysis of chromatin and histone modifications.
  • DNA repair and DNA damage assays in both chicken and human cell lines.
  • Analysis of protein modification and stabilization post-DNA damage.

Main Results:

  • Msl2-deficient cells exhibit minor growth defects and altered histone modifications.
  • Both Msl2-deficient chicken cells and hMSL2-depleted human cells show defects in non-homologous end joining (NHEJ) repair.
  • MSL2 protein is stabilized and modified following DNA damage, mediating 53BP1 ubiquitylation at Lys1690.
  • hMSL1 and hMOF are also modified in the presence of hMSL2 after DNA damage.

Conclusions:

  • MSL2/hMSL2 plays a novel and significant role in the cellular response to DNA damage.
  • Its stabilization kinetics suggest an early involvement in the NHEJ repair pathway.
  • MSL2 contributes to DNA damage response by maintaining histone modification profiles and modifying key repair proteins like 53BP1.

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