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Related Experiment Videos

Recombinational DNA double-strand breaks in mice precede synapsis.

S K Mahadevaiah1, J M Turner, F Baudat

  • 1Division of Developmental Genetics, National Institute for Medical Research, London, UK.

Nature Genetics
|March 10, 2001
PubMed
Summary

Meiotic recombination in mice begins with Spo11-dependent double-strand breaks (DSBs) during leptotene. The loss of gamma-H2AX staining, marking DSB sites, correlates with synapsis, even non-homologous pairing.

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Area of Science:

  • Reproductive Biology
  • Genetics
  • Molecular Biology

Background:

  • Meiotic recombination initiates via Spo11-dependent double-strand breaks (DSBs) in yeast, preceding homologous synapsis.
  • Understanding DSB dynamics in mammals is crucial for reproductive health and genetic diversity.

Purpose of the Study:

  • To investigate the timing, distribution, and Spo11-dependence of meiotic DSBs in the mouse.
  • To characterize the role of gamma-H2AX as a marker for DSBs during mouse meiosis.

Main Methods:

  • Utilized an antibody specific for phosphorylated histone gamma-H2AX to identify DSB sites.
  • Examined the temporal and spatial correlation between gamma-H2AX staining and synapsis.
  • Assessed the Spo11-dependence of DSB formation.

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Main Results:

  • Confirmed that meiotic DSBs in mice are Spo11-dependent and occur during leptotene, similar to yeast.
  • Demonstrated that loss of gamma-H2AX staining is temporally and spatially linked with synapsis.
  • Observed this correlation even in cases of non-homologous synapsis.

Conclusions:

  • Meiotic recombination in mice is initiated by Spo11-dependent DSBs during leptotene.
  • Gamma-H2AX serves as a reliable marker for DSBs and their repair dynamics during mouse meiosis.
  • DSB repair and synapsis are coordinated processes, irrespective of homologous pairing.