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National Institute of Environmental Health Sciences

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Publication Detail

Title: Centromeric SMC1 promotes centromere clustering and stabilizes meiotic homolog pairing.

Authors: Hatkevich, Talia; Boudreau, Vincent; Rubin, Thomas; Maddox, Paul S; Huynh, Jean-René; Sekelsky, Jeff

Published In PLoS Genet, (2019 10)

Abstract: During meiosis, each chromosome must selectively pair and synapse with its own unique homolog to enable crossover formation and subsequent segregation. How homolog pairing is maintained in early meiosis to ensure synapsis occurs exclusively between homologs is unknown. We aimed to further understand this process by examining the meiotic defects of a unique Drosophila mutant, Mcm5A7. We found that Mcm5A7 mutants are proficient in homolog pairing at meiotic onset yet fail to maintain pairing as meiotic synapsis ensues, causing seemingly normal synapsis between non-homologous loci. This pairing defect corresponds with a reduction of SMC1-dependent centromere clustering at meiotic onset. Overexpressing SMC1 in this mutant significantly restores centromere clustering, homolog pairing, and crossover formation. These data indicate that the initial meiotic pairing of homologs is not sufficient to yield synapsis exclusively between homologs and provide a model in which meiotic homolog pairing must be stabilized by centromeric SMC1 to ensure proper synapsis.

PubMed ID: 31609962 Exiting the NIEHS site

MeSH Terms: No MeSH terms associated with this publication

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