Chromosoma

, Volume 110, Issue 5, pp 322–334 | Cite as

A conserved protein, Nuf2, is implicated in connecting the centromere to the spindle during chromosome segregation: a link between the kinetochore function and the spindle checkpoint

  • Akira Nabetani
  • Takako Koujin
  • Chihiro Tsutsumi
  • Tokuko Haraguchi
  • Yasushi Hiraoka
Original Article

Abstract.

The centromere is crucial for the proper segregation of chromosomes in all eukaryotic cells. We identified a centromeric protein, Nuf2, which is conserved in fission yeast, human, nematode, and budding yeast. Gene disruption of nuf2+ in the fission yeast Schizosaccharomyces pombe caused defects in chromosome segregation and the spindle checkpoint: the mitotic spindle elongated without segregating the chromosomes, indicating that spindle function was compromised, but that this abnormality did not result in metaphase arrest. Certain nuf2 temperature-sensitive mutations, however, caused metaphase arrest with condensed chromosomes and a short spindle, indicating that, while these mutations caused abnormalities in spindle function, the spindle checkpoint pathway remained intact. Metaphase arrest in these cells was dependent on the spindle checkpoint component Mad2. Interestingly, Nuf2 disappeared from the centromere during meiotic prophase when centromeres lose their connection to the spindle pole body. We propose that Nuf2 acts at the centromere to establish a connection with the spindle for proper chromosome segregation, and that Nuf2 function is also required for the spindle checkpoint.

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Akira Nabetani
    • 1
  • Takako Koujin
    • 1
  • Chihiro Tsutsumi
    • 1
  • Tokuko Haraguchi
    • 1
  • Yasushi Hiraoka
    • 1
  1. 1.Cell Biology Group, Kansai Advanced Research Center, Communications Research Laboratory, 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe 651-2492, Japan, and CREST Research Project, the Japan Science and Technology Corporation, Japan

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