Abstract
In sexually reproducing organisms, the formation of healthy gametes (sperm and eggs) requires the proper establishment and release of meiotic sister chromatid cohesion (SCC). SCC tethers replicated sisters from their formation in premeiotic S phase until the stepwise removal of cohesion in anaphase of meiosis I and II allows the separation of homologs and then sisters. Defects in the establishment or release of meiotic cohesion cause chromosome segregation errors that lead to the formation of aneuploid gametes and inviable embryos. The nematode Caenorhabditis elegans is an attractive model for studies of meiotic sister chromatid cohesion due to its genetic tractability and the excellent cytological properties of the hermaphrodite gonad. Moreover, mutants defective in the establishment or maintenance of meiotic SCC nevertheless produce abundant gametes, allowing analysis of the pattern of chromosome segregation. Here I describe two approaches for analysis of meiotic cohesion in C. elegans. The first approach relies on cytology to detect and quantify defects in SCC. The second approach relies on PCR and restriction digests to identify embryos that inherited an incorrect complement of chromosomes due to aberrant meiotic chromosome segregation. Both approaches are sensitive enough to identify rare errors and precise enough to reveal distinctive phenotypes resulting from mutations that perturb meiotic SCC in different ways. The robust, quantitative nature of these assays should strengthen phenotypic comparisons of different meiotic mutants and enhance the reproducibility of data generated by different investigators.
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Acknowledgements
I would like to acknowledge Barbara Meyer for her support and guidance during my postdoctoral research, when I developed many of the techniques described here. Strains used during the development of these methods were provided by the CGC, which is funded by the NIH Office of Research Infrastructure Programs (P40 OD010440), and the National Bioresource Project. This work was supported through NIH grant R15GM117548, startup funds provided by Cleveland State University and the Center for Gene Regulation in Health and Disease, and a Graduate Faculty Travel Award administered through the CSU Office of Research.
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Severson, A.F. (2017). Analysis of Meiotic Sister Chromatid Cohesion in Caenorhabditis elegans . In: Yokomori, K., Shirahige, K. (eds) Cohesin and Condensin. Methods in Molecular Biology, vol 1515. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6545-8_5
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DOI: https://doi.org/10.1007/978-1-4939-6545-8_5
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