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Related Concept Videos

Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
Crossing Over01:30

Crossing Over

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, duplicated...
Crossing Over01:34

Crossing Over

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.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Homologous Recombination02:31

Homologous Recombination

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...
Homologous Recombination02:31

Homologous Recombination

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...
Gene Conversion02:08

Gene Conversion

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: May 21, 2026

Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy
11:40

Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy

Published on: June 25, 2013

Why recombination hotspots?

Julien Joseph1,2, Thomas Brazier3, Marie Raynaud4,5

  • 1Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR5558, Villeurbanne, France.

Plos Genetics
|May 19, 2026
PubMed
Summary
This summary is machine-generated.

Meiotic recombination exchanges DNA between chromosomes to create diverse gametes. This review explores recombination hotspots, their characteristics, and evolutionary origins.

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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
06:24

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

Published on: February 13, 2019

Related Experiment Videos

Last Updated: May 21, 2026

Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy
11:40

Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy

Published on: June 25, 2013

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
06:24

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

Published on: February 13, 2019

Area of Science:

  • Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Meiotic recombination is crucial for eukaryotic fertility, genetic diversity, and genome stability.
  • Recombination is not uniform across genomes; specific regions known as recombination hotspots concentrate these events.
  • Understanding recombination hotspots is key to comprehending genome regulation and evolution.

Purpose of the Study:

  • To review existing theories on the existence of recombination hotspots.
  • To discuss recent advances in characterizing recombination landscapes and their determinants.
  • To propose future research directions for understanding the evolutionary origins of recombination hotspots.

Main Methods:

  • Literature review and synthesis of current research on meiotic recombination.
  • Analysis of recent findings in characterizing fine-scale recombination patterns.
  • Discussion of theoretical frameworks explaining recombination hotspot formation.

Main Results:

  • Recombination hotspots exhibit significant diversity in their characteristics and genomic distribution.
  • Recent advances provide insights into the molecular determinants shaping recombination landscapes.
  • Multiple theories attempt to explain hotspot existence, with ongoing debate and refinement.

Conclusions:

  • Recombination hotspots are critical regulatory elements influencing genome evolution.
  • Further research is needed to fully elucidate the evolutionary origins and functional significance of recombination hotspots.
  • Integrating diverse research approaches will advance our understanding of meiotic recombination patterns.