Open AccessSlx5p‐Slx8p Promotes Accurate Chromosome Segregation by Mediating the Degradation of Synaptonemal Complex Components during Meiosis
Author(s) -
Liu Chao,
Zhao Haichao,
Xiao Sai,
Han Tingting,
Chen Yinghong,
Wang Tong,
Ma Yanjie,
Gao Hui,
Xie Zhiping,
Du LiLin,
Li Jian,
Li Guoping,
Li Wei
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201900739
Subject(s) - meiosis , synaptonemal complex , chromosome segregation , sumo protein , biology , microbiology and biotechnology , ubiquitin ligase , homologous recombination , crosstalk , ubiquitin , genetics , homologous chromosome , chromosome , dna , gene , physics , optics
Abstract Meiosis increases genetic diversity, yet the genome complement needs to be stable to ensure offspring viability. Both small ubiquitin‐like modifier (SUMO) and ubiquitin have been reported to participate in meiotic regulation, yet functions of the SUMO‐ubiquitination crosstalk in meiosis remain unclear. Here, it is reported that a SUMO‐targeted ubiquitin ligase, Slx8p, promotes accurate chromosome segregation during meiosis, since the deletion of SLX8 leads to increased aneuploidy due to a defect in synaptonemal complex (SC) component degradation. Both the RING domain and SUMO interacting motifs of Slx8p are essential for meiotic progression and maintaining spore viability, and the expression of tetraubiquitin fused with SUMO partially rescues meiotic defects in the SLX8 ‐deletion strain. Furthermore, Slx5p‐Slx8p can directly add ubiquitin to SUMOylated Zip1p and Ecm11p, and forced degradation of Ecm11p partially rescues the sporulation defects of the SLX8 deletion strain. These findings provide a mechanism for SC disassembly and reveal that the crosstalk between SUMOylation and ubiquitination facilitates accurate chromosome segregation by promoting SC component degradation during meiosis.