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DNA Damage can Stall the Cell Cycle02:36

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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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Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
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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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Laser Microirradiation to Study In Vivo Cellular Responses to Simple and Complex DNA Damage
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Nucleolar caspase-2: Protecting us from DNA damage.

Kenneth J O'Byrne1, Derek J Richard2

  • 1School of Biomedical Research, Institute of Health and Biomedical Innovation at the Translational Research Institute, Queensland University of Technology, Woolloongabba QLD 4102, Australia.

The Journal of Cell Biology
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Caspase-2 initiates programmed cell death (apoptosis). This study reveals two activation pathways, with DNA damage triggering caspase-2 complex formation involving PIDDosome and NPM1 in the nucleolus.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Apoptosis Research

Background:

  • Caspase-2 is a key initiator of apoptosis.
  • Mechanisms of caspase-2 activation by various stimuli remain incompletely understood.

Purpose of the Study:

  • To elucidate the distinct pathways regulating caspase-2 activation.
  • To investigate the molecular players and subcellular localization during caspase-2 activation in response to DNA damage.

Main Methods:

  • The study likely employed techniques such as Western blotting, immunoprecipitation, and microscopy to analyze protein interactions and localization.
  • Investigated the role of PIDDosome and NPM1 in caspase-2 activation.

Main Results:

  • Two distinct pathways for caspase-2 activation were identified.
  • Upon DNA damage, caspase-2 was observed to form a complex with the PIDDosome and Nucleophosmin 1 (NPM1) within the nucleolus.

Conclusions:

  • The findings delineate novel mechanisms of caspase-2 activation.
  • Identified a specific role for the nucleolus in mediating caspase-2 activation during the DNA damage response.