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DNA Damage can Stall the Cell Cycle02:37

DNA Damage can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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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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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Laser Microirradiation to Study In Vivo Cellular Responses to Simple and Complex DNA Damage
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The DNA damage response in the chromatin context: A coordinated process.

Juliette Dabin1, Margherita Mori1, Sophie E Polo1

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DNA damage response (DDR) intricately coordinates with chromatin maintenance. Chromatin structure influences DDR, while DDR impacts chromatin, revealing critical regulatory mechanisms for cell viability.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Cell nucleus DNA damage response and repair are crucial for cell viability.
  • Chromatin structure integrity is vital for DNA damage response (DDR).

Purpose of the Study:

  • Review recent advances in the coordination between chromatin maintenance and DDR.
  • Elucidate the molecular mechanisms underlying this interplay in physiological and pathological states.

Main Methods:

  • Literature review of recent scientific advances.
  • Synthesis of current knowledge on chromatin-DDR interactions.

Main Results:

  • The DDR influences chromatin marks, organization, and mobility.
  • Chromatin alterations actively regulate and contribute to the DDR.
  • This interplay provides additional layers of biological regulation.

Conclusions:

  • The coordination between chromatin maintenance and DDR is a tightly regulated process.
  • Understanding these molecular bases is critical for physiological and pathological conditions.
  • Further research is needed to address open questions in this expanding field.