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Homologous Recombination02:31

Homologous Recombination

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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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Fixing Double-strand Breaks02:04

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Overview of DNA Repair02:25

Overview of DNA Repair

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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.
Chemically...
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Nucleotide Excision Repair01:38

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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Related Experiment Video

Updated: Oct 12, 2025

Visualization of DNA Repair Proteins Interaction by Immunofluorescence
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Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

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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.