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Meiotic pairing and double-strand break formation along the heteromorphic threespine stickleback sex chromosomes

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Abstract

Double-strand break repair during meiosis is normally achieved using the homologous chromosome as a repair template. Heteromorphic sex chromosomes share little sequence homology, presenting unique challenges to the repair of double-strand breaks. Our understanding of how heteromorphic sex chromosomes behave during meiosis has been focused on ancient sex chromosomes, where the X and Y differ markedly in overall structure and gene content. It remains unclear how more recently evolved sex chromosomes that share considerably more sequence homology with one another pair and form double-strand breaks. One possibility is barriers to pairing evolve rapidly. Alternatively, recently evolved sex chromosomes may exhibit pairing and double-strand break repair that more closely resembles that of their autosomal ancestors. Here, we use the recently evolved X and Y chromosomes of the threespine stickleback fish (Gasterosteus aculeatus) to study patterns of pairing and double-stranded break formation using molecular cytogenetics. We found that the sex chromosomes of threespine stickleback fish did not pair exclusively in the pseudoautosomal region. Instead, the chromosomes fully paired in a non-homologous fashion. To achieve this, the X chromosome underwent synaptic adjustment during pachytene to match the axis length of the Y chromosome. Double-strand break formation and repair rate also matched that of the autosomes. Our results highlight that recently evolved sex chromosomes exhibit meiotic behavior that is reminiscent of autosomes and argues for further work to identify the homologous templates that are used to repair double-strand breaks on the X and Y chromosomes.

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Abbreviations

DSB:

Double-strand breaks

FISH:

Fluorescent in situ hybridization

Idh :

Isocitrate dehydrogenase

RAD51:

RAD51 recombinase

SMC3:

Structural maintenance of chromosomes 3

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Acknowledgements

The authors thank Shaugnessy McCann, Jackie Cory, Jim Cory, Damean McCann, and Bill Frothingham for assistance collecting threespine stickleback fish. Kelly Dawe, Beth Dumont, and Kyle Swentowsky provided assistance in troubleshooting and useful discussions of our results. Brittany Dorsey helped count RAD51 foci.

Funding

This work was supported by the National Science Foundation MCB 1943283 to M.A.W.

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Authors

Contributions

M.A.W. and S.N. conceived and designed the study. S.N., L.A.W., and M.K.F. performed the research. S.N. and M.A.W. analyzed the data. S.N. and M.A.W. wrote the paper.

Corresponding author

Correspondence to Michael A. White.

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The authors declare no competing interests.

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Nath, S., Welch, L.A., Flanagan, M.K. et al. Meiotic pairing and double-strand break formation along the heteromorphic threespine stickleback sex chromosomes. Chromosome Res 30, 429–442 (2022). https://doi.org/10.1007/s10577-022-09699-0

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  • DOI: https://doi.org/10.1007/s10577-022-09699-0

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