Crossover recombination and synapsis are linked by adjacent regions within the N terminus of the Zip1 synaptonemal complex protein - Institut Curie Accéder directement au contenu
Article Dans Une Revue PLoS Genetics Année : 2019

Crossover recombination and synapsis are linked by adjacent regions within the N terminus of the Zip1 synaptonemal complex protein

Melanie Parziale
  • Fonction : Auteur
Shun-Yun Cheng
  • Fonction : Auteur
Karen Voelkel-Meiman
  • Fonction : Auteur
Savannah J. Morehouse
  • Fonction : Auteur
Arden Feil
  • Fonction : Auteur
Owen R.Davies
  • Fonction : Auteur
Amy J. Macqueen
  • Fonction : Auteur

Résumé

Accurate chromosome segregation during meiosis relies on the prior establishment of at least one crossover recombination event between homologous chromosomes. Most mei-otic recombination intermediates that give rise to interhomolog crossovers are embedded within a hallmark chromosomal structure called the synaptonemal complex (SC), but the mechanisms that coordinate the processes of SC assembly (synapsis) and crossover recombination remain poorly understood. Among known structural components of the budding yeast SC, the Zip1 protein is unique for its independent role in promoting crossover recombination; Zip1 is specifically required for the large subset of crossovers that also rely on the meiosis-specific MutSγ complex. Here we report that adjacent regions within Zip1's N terminus encompass its crossover and synapsis functions. We previously showed that deletion of Zip1 residues 21-163 abolishes tripartite SC assembly and prevents robust SUMOylation of the SC central element component, Ecm11, but allows excess MutSγ crossover recombination. We find the reciprocal phenotype when Zip1 residues 2-9 or 10-14 are deleted; in these mutants SC assembles and Ecm11 is hyperSUMOylated, but MutSγ crossovers are strongly diminished. Interestingly, Zip1 residues 2-9 or 2-14 are required for the normal localization of Zip3, a putative E3 SUMO ligase and pro-MutSγ crossover factor, to Zip1 polycomplex structures and to recombination initiation sites. By contrast, deletion of Zip1 residues 15-20 does not detectably prevent Zip3's localization at Zip1 polycomplex and supports some MutSγ crossing over but prevents normal SC assembly and Ecm11 SUMOylation. Our results highlight distinct N terminal regions that are differentially critical for Zip1's roles in crossing over and SC assembly; we speculate that the adjacency of these regions enables Zip1 to serve as a liaison, facilitating crosstalk between PLOS Genetics | https://doi.
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Dates et versions

hal-02413042 , version 1 (16-12-2019)

Identifiants

  • HAL Id : hal-02413042 , version 1

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Melanie Parziale, Shun-Yun Cheng, Karen Voelkel-Meiman, Savannah J. Morehouse, Arden Feil, et al.. Crossover recombination and synapsis are linked by adjacent regions within the N terminus of the Zip1 synaptonemal complex protein. PLoS Genetics, 2019. ⟨hal-02413042⟩
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