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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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DNA Repair in Haploid Context.

Loïs Mourrain1, Guylain Boissonneault1

  • 1Department of Biochemistry and Functional Genomics, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada.

International Journal of Molecular Sciences
|November 27, 2021
PubMed
Summary

Ploidy status significantly impacts DNA repair capacity, especially in haploid gametes. This review highlights how homologous chromosomes affect repair, crucial for transgenerational genetic inheritance.

Keywords:
DNA repairSaccharomyces cerevisiaeSchizosaccharomyces pombediploidgameteshaploid

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • DNA repair is critical for maintaining genetic integrity and preventing disease.
  • The role of ploidy (chromosome number) in DNA repair is often overlooked.
  • Gametes (sperm and oocytes) have unique DNA repair needs due to their role in inheritance.

Purpose of the Study:

  • To explore the impact of ploidy on DNA repair mechanisms.
  • To understand how DNA repair differences in gametes affect transgenerational inheritance.
  • To compare DNA repair in haploid and diploid states using model organisms.

Main Methods:

  • Literature review focusing on DNA repair pathways and ploidy.
  • Comparative analysis of DNA repair in haploid and diploid organisms.
  • Examination of gamete-specific DNA repair strategies.

Main Results:

  • Homologous chromosomes significantly influence cellular DNA repair capabilities.
  • Haploid gametes possess distinct DNA repair mechanisms compared to diploid cells.
  • Oocytes prioritize repair fidelity, while sperm may tolerate more variations.

Conclusions:

  • Ploidy is a crucial factor in DNA repair efficiency and outcomes.
  • Understanding gamete DNA repair is essential for studying inheritance and genetic variation.
  • Model organisms like yeast provide insights into ploidy-dependent DNA repair.