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Sororin is enriched at the central region of synapsed meiotic chromosomes

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Abstract

During meiotic prophase, cohesin complexes mediate cohesion between sister chromatids and promote pairing and synapsis of homologous chromosomes. Precisely how the activity of cohesin is controlled to promote these events is not fully understood. In metazoans, cohesion establishment between sister chromatids during mitotic divisions is accompanied by recruitment of the cohesion-stabilizing protein Sororin. During somatic cell division cycles, Sororin is recruited in response to DNA replication-dependent modification of the cohesin complex by ESCO acetyltransferases. How Sororin is recruited and acts in meiosis is less clear. Here, we have surveyed the chromosomal localization of Sororin and its relationship to the meiotic cohesins and other chromatin modifiers with the objective of determining how Sororin contributes to meiotic chromosome dynamics. We show that Sororin localizes to the cores of meiotic chromosomes in a manner that is dependent on synapsis and the synaptonemal complex protein SYCP1. In contrast, cohesin, with which Sororin interacts in mitotic cells, shows axial enrichment on meiotic chromosomes even in the absence of synapsis between homologs. Using high-resolution microscopy, we show that Sororin is localized to the central region of the synaptonemal complex. These results indicate that Sororin regulation during meiosis is distinct from its regulation in mitotic cells and may suggest that it interacts with a distinctly different partner to ensure proper chromosome dynamics in meiosis.

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Abbreviations

SC:

Synaptonemal complex

SA:

Stromal antigen

AE:

Axial element

LE:

Lateral element

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Acknowledgements

We are grateful to Christer Hoog for providing the Sycp1 mutant mouse, John Schimenti for providing Sycp3 and Rec8 mutant mice, and Dean Dawson for careful review of the manuscript. We are also grateful the excellent technical support of Ben Fowler and Julie Crane of the OMRF Imaging Core in the collection of 3D SIM images. The OMX super resolution microscope was recently purchased with the generous support of the Oklahoma Center for Adult Stem Cell Research. This work was supported by National Institutes of Health grants GM117155 and HD069458 to P.W.J., GM103636 to R.J.P., GM101250 to S.R. and March of Dimes research grant FY14-256 to R.J.P. The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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Correspondence to Roberto J. Pezza or Susannah Rankin.

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All mice were bred at Johns Hopkins University (JHU, Baltimore, MD) or at Oklahoma Medical Research Foundation (OMRF, Oklahoma City, OK) under standard conditions in accordance with the National Institutes of Health and the US Department of Agriculture criteria, and protocols for their care and use were approved by the Institutional Animal Care and Use Committees (IACUC) of JHU and OMRF.

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Responsible Editor: Beth A Sullivan

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Jordan, P.W., Eyster, C., Chen, J. et al. Sororin is enriched at the central region of synapsed meiotic chromosomes. Chromosome Res 25, 115–128 (2017). https://doi.org/10.1007/s10577-016-9542-8

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  • DOI: https://doi.org/10.1007/s10577-016-9542-8

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