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Related Concept Videos

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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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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Crossing Over01:30

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Crossing Over01:34

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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Updated: Jan 15, 2026

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
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Meiotic Recombination May Be Initiated by Copy Choice During DNA Synthesis Rather than Break/Join Mechanism.

Lei Jia1, Na Yin1,2, Xiaolin Wang1

  • 1State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100850, China.

International Journal of Molecular Sciences
|October 16, 2025
PubMed
Summary

This study revises DNA meiotic recombination models, proposing a copy choice mechanism initiated by DNA branching. This updated model reconciles experimental data and theoretical discrepancies in recombination pathways.

Keywords:
DNA meiotic recombinationbranched structurechromosomecopy choicegeneticmeiosisresolution pattern of a Holliday Junction

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • DNA meiotic recombination is crucial for genetic diversity.
  • Previous molecular models have undergone revisions but still present issues.
  • Experimental data continually expands, necessitating updated theoretical frameworks.

Purpose of the Study:

  • To upgrade existing models of DNA meiotic recombination.
  • To reanalyze experimental data using a novel biophysical modeling approach.
  • To explore structural details and molecular mechanisms of meiotic recombination.

Main Methods:

  • Literature review of eligible studies from PubMed/Medline (up to June 2024).
  • Retrieval of key publications and experimental data.
  • Application of biophysical modeling to establish an enlacement model.
  • Reanalysis of collected data using the established model.

Main Results:

  • An updated molecular model is proposed, initiating recombination via a copy choice mechanism.
  • The model explains discrepancies, including SDSA model characteristics within the intertwinement model.
  • It suggests heteroduplex DNA (hDNA) arises from junction mediation (JM) resolution, not preceding it.
  • Strand specificity in hDNA mismatch repair may be an illusion, with copy choice being the likely mechanism.
  • Parity in double Holliday junction (dHJ) resolution correlates with gene conversion.
  • Cooperation of multiple Holliday junctions (HJs) links gene conversion and crossover.
  • Transpositional and site-specific recombination may share pathways with meiotic recombination.

Conclusions:

  • Revisions and reanalysis of DNA meiotic recombination models are essential.
  • Novel interpretations clarify mechanisms of DNA recombination and its role in DNA repair.
  • Findings may influence the understanding of factors like Spo11 and meiotic pairing mechanisms.