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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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Micronuclear collapse from oxidative damage.

Melody Di Bona1,2, Yanyang Chen3, Albert S Agustinus1,2,4

  • 1Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.

Science (New York, N.Y.)
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

Mitochondria-generated reactive oxygen species (ROS) disrupt cancer cell micronuclei by altering charged multivesicular body protein 7 (CHMP7) function, leading to chromosome damage and promoting cancer progression, especially under hypoxia.

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Molecular Oncology

Background:

  • Chromosome-containing micronuclei are characteristic of aggressive cancers.
  • Micronuclear rupture leads to chromosomal instability, epigenetic changes, and inflammation.
  • Mechanisms protecting micronuclear integrity remain largely unknown.

Purpose of the Study:

  • To investigate the mechanisms by which reactive oxygen species (ROS) affect micronuclear integrity.
  • To elucidate the role of charged multivesicular body protein 7 (CHMP7) in ROS-mediated micronuclear disruption.

Main Methods:

  • Investigated the interaction between mitochondria-derived ROS and CHMP7 within micronuclei.
  • Analyzed the effect of ROS on CHMP7 oligomerization and its interaction with LEMD2.
  • Examined the consequences of the ROS-CHMP7 axis on chromosomal integrity and micronuclear stability under normoxic and hypoxic conditions.

Main Results:

  • Mitochondria-derived ROS disrupt micronuclei by altering CHMP7's function, a component of the ESCRT-III complex.
  • ROS promote CHMP7 retention and oligomerization within micronuclei, disrupting interactions with other ESCRT-III proteins and binding to LEMD2.
  • This pathological axis results in chromosome shattering and micronuclear disintegration, particularly under hypoxic tumor conditions.

Conclusions:

  • A novel ROS-CHMP7 pathway contributes to micronuclear envelope rupture and genomic instability in cancer.
  • This pathway links mitochondrial dysfunction and hypoxia to processes driving cancer progression.
  • Understanding this mechanism offers potential therapeutic targets for aggressive cancers.