Abstract
In Saccharomyces cerevisiae, meiotic recombination is initiated by Spo11-dependent double-strand breaks (DSBs), a process that precedes homologous synapsis. Here we use an antibody specific for a phosphorylated histone (γ-H2AX, which marks the sites of DSBs) to investigate the timing, distribution and Spo11-dependence of meiotic DSBs in the mouse. We show that, as in yeast, recombination in the mouse is initiated by Spo11-dependent DSBs that form during leptotene. Loss of γ-H2AX staining (which in irradiated somatic cells is temporally linked with DSB repair) is temporally and spatially correlated with synapsis, even when this synapsis is 'non-homologous'.
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Acknowledgements
We thank H.-J. Garchon for the anti-XLR antibody; P. Moens and B. Spyropoulos for the anti-COR1 and anti-SYN1 antibodies; A. Davies, J.-Y. Masson and S. West for the anti-DMC1 antibody; R. Benavente for the anti-SCP3 antibody; W. Earnshaw for the CREST antibody; H. te Riele for providing Msh5−/− mice; S. Pagakis for help with imaging; and Á. Rattigan and O. Ojarikre for help with mouse genotyping and breeding.
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Mahadevaiah, S., Turner, J., Baudat, F. et al. Recombinational DNA double-strand breaks in mice precede synapsis. Nat Genet 27, 271–276 (2001). https://doi.org/10.1038/85830
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DOI: https://doi.org/10.1038/85830
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