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Overview of DNA Repair02:25

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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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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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RNA Damage Responses in Cellular Homeostasis, Genome Stability, and Disease.

Hani S Zaher1, Nima Mosammaparast2

  • 1Department of Biology, Washington University in St. Louis, St. Louis, Missouri, USA;

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|October 30, 2024
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Cells must maintain RNA integrity to prevent disease. RNA damage, though often overlooked, triggers quality control and is critical for cellular homeostasis, with its misregulation linked to neurodegenerative conditions.

Keywords:
DNA repairRNA damageRNA quality controlalkylationoxidationribosomespliceosome

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • Cells are constantly exposed to DNA and RNA damaging agents.
  • DNA damage research is extensive due to links with cancer.
  • RNA damage and its cellular consequences are increasingly recognized as critical.

Purpose of the Study:

  • To highlight the significance of RNA damage.
  • To emphasize the role of RNA quality control mechanisms.
  • To connect RNA damage and cellular homeostasis to human diseases.

Main Methods:

  • Literature review focusing on nucleic acid damage.
  • Analysis of conserved RNA quality control pathways.
  • Examination of disease states linked to RNA processing.

Main Results:

  • RNA damage triggers specific cellular quality control responses.
  • Despite RNA's transient nature, its integrity is vital.
  • Dysregulation of RNA quality control is implicated in neurodevelopmental and neurodegenerative diseases.

Conclusions:

  • Proper handling of damaged RNA is essential for cellular homeostasis.
  • RNA quality control is a critical cellular process.
  • Further research into RNA damage pathways may reveal new therapeutic targets for neurological disorders.