Abstract
Caenorhabditis elegans chromosomes contain specialized regions called pairing centres, which mediate homologous pairing and synapsis during meiosis. Four related proteins, ZIM-1, 2, 3 and HIM-8, associate with these sites and are required for their essential functions. Here we show that short sequence elements enriched in the corresponding chromosome regions selectively recruit these proteins in vivo. In vitro analysis using SELEX indicates that the binding specificity of each protein arises from a combination of two zinc fingers and an adjacent domain. Insertion of a cluster of recruiting motifs into a chromosome lacking its endogenous pairing centre is sufficient to restore homologous pairing, synapsis, crossover recombination and segregation. These findings help to illuminate how chromosome sites mediate essential aspects of meiotic chromosome dynamics.
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Acknowledgements
This work was supported by an NSF Predoctoral Fellowship (C.M.P.) and by Burroughs Wellcome Career Award 1000950 and NIH R01 GM065591 (A.F.D.). We are grateful to Anne Villeneuve for SYP-1 antibodies, Barbara Meyer, Kevin Corbett and Ed Rebar for valuable suggestions, to members of the Meyer lab for assistance with the extrachromosomal array assay and to members of the Dernburg lab and anonymous referees for helpful comments on the manuscript.
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C.M.P. and A.F.D. designed most experiments and wrote the manuscript. J.H.C. provided cDNA clones for the SELEX assays, which were executed by X.M. and L.Z. with guidance from F.D.U. All other experiments were performed by C.M.P.
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Phillips, C., Meng, X., Zhang, L. et al. Identification of chromosome sequence motifs that mediate meiotic pairing and synapsis in C. elegans. Nat Cell Biol 11, 934–942 (2009). https://doi.org/10.1038/ncb1904
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DOI: https://doi.org/10.1038/ncb1904
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