Sororin loads to the synaptonemal complex central region independently of meiotic cohesin complexes

EMBO Rep. 2016 May;17(5):695-707. doi: 10.15252/embr.201541060. Epub 2016 Mar 7.

Abstract

The distribution and regulation of the cohesin complexes have been extensively studied during mitosis. However, the dynamics of their different regulators in vertebrate meiosis is largely unknown. In this work, we have analyzed the distribution of the regulatory factor Sororin during male mouse meiosis. Sororin is detected at the central region of the synaptonemal complex during prophase I, in contrast with the previously reported localization of other cohesin components in the lateral elements. This localization of Sororin depends on the transverse filaments protein SYCP1, but not on meiosis-specific cohesin subunits REC8 and SMC1β. By late prophase I, Sororin accumulates at centromeres and remains there up to anaphase II The phosphatase activity of PP2A seems to be required for this accumulation. We hypothesize that Sororin function at the central region of the synaptonemal complex could be independent on meiotic cohesin complexes. In addition, we suggest that Sororin participates in the regulation of centromeric cohesion during meiosis in collaboration with SGO2-PP2A.

Keywords: Sororin; centromere; cohesin complex; meiosis; synaptonemal complex.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing / genetics*
  • Adaptor Proteins, Signal Transducing / metabolism
  • Animals
  • Cell Cycle / genetics
  • Cell Cycle Proteins / genetics*
  • Cell Cycle Proteins / metabolism*
  • Centromere*
  • Chromosomal Proteins, Non-Histone / metabolism*
  • Gene Expression
  • Humans
  • Male
  • Meiosis*
  • Mice
  • Mice, Knockout
  • Spermatocytes / metabolism
  • Synaptonemal Complex*

Substances

  • Adaptor Proteins, Signal Transducing
  • CDCA5 protein, human
  • Cell Cycle Proteins
  • Chromosomal Proteins, Non-Histone
  • cohesins