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Novel DNA damage checkpoint in mitosis: Mitotic DNA damage induces re-replication without cell division in various

Sun-Yi Hyun1, Eliot M Rosen, Young-Joo Jang

  • 1World Class University Research Program, Department of Nanobiomedical Science, Dankook University, 29 Anseo-Dong, Cheonan 330-714, Republic of Korea.

Biochemical and Biophysical Research Communications
|June 19, 2012
PubMed

Insights

Mitotic DNA damage causes cells to re-replicate DNA without dividing, leading to 8N DNA content and apoptosis. This process, involving ATM/Chk1 pathways, results in mitotic slippage and cell death during prolonged repair.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • DNA damage triggers checkpoint pathways to halt cell cycle progression for repair.
  • Previous studies showed prometaphase DNA damage leads to 4N G1 arrest dependent on ATM/Chk1.

Purpose of the Study:

  • To investigate if prolonged mitotic DNA damage causes cells to skip late mitotic stages.
  • To elucidate the mechanism of cell cycle progression following mitotic DNA damage under extended repair conditions.

Main Methods:

  • Time-lapse microscopy to observe cell behavior.
  • Analysis of DNA content (4N, 8N) and cell cycle progression.
  • Investigated the role of ATM/Chk1 pathways and DNA replication inhibition.

Main Results:

  • Cells with 4N DNA damage re-replicated DNA without cell division, reaching 8N DNA content.
  • Increased activity of apoptotic factors was observed in 8N cells.
  • Inhibiting DNA replication significantly reduced the 8N cell population.
  • Replication without division was dependent on ATM and Chk1.

Conclusions:

  • Mitotic DNA damage induces mitotic slippage, where cells enter G1 with 4N DNA content.
  • Subsequent DNA replication to 8N occurs before mitosis completion in an ATM/Chk1-dependent manner.
  • This leads to caspase-dependent apoptosis during long-term repair.

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