Graduate School of Frontier Biosciences, Osaka University

Japanese

Nup132 modulates meiotic spindle attachment in fission yeast by regulating kinetochore assembly.

Journal J Cell Biol 211, 295-308 (2015)
Authors Yang HJ (1), Asakawa H (1), Haraguchi T (1, 2), Hiraoka Y (1, 2)

  1. Graduate School of Frontier Biosciences, Osaka University, Japan
  2. Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology, Japan
Title Nup132 modulates meiotic spindle attachment in fission yeast by regulating kinetochore assembly.
PubMed 26483559
Laboratory Nuclear Dynamics Group 〈Prof. Hiraoka〉
Abstract

During meiosis, the kinetochore undergoes substantial reorganization to establish monopolar spindle attachment. In the fission yeast Schizosaccharomyces pombe, the KNL1-Spc7-Mis12-Nuf2 (KMN) complex, which constitutes the outer kinetochore, is disassembled during meiotic prophase and is reassembled before meiosis I. Here, we show that the nucleoporin Nup132 is required for timely assembly of the KMN proteins: In the absence of Nup132, Mis12 and Spc7 are precociously assembled at the centromeres during meiotic prophase. In contrast, Nuf2 shows timely dissociation and reappearance at the meiotic centromeres. We further demonstrate that depletion of Nup132 activates the spindle assembly checkpoint in meiosis I, possibly because of the increased incidence of erroneous spindle attachment at sister chromatids. These results suggest that precocious assembly of the kinetochores leads to the meiosis I defects observed in the nup132-disrupted mutant. Thus, we propose that Nup132 plays an important role in establishing monopolar spindle attachment at meiosis I through outer kinetochore reorganization at meiotic prophase.