1. Csi1 links centromeres to the nuclear envelope for centromere clustering
- Author
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Yu Wang, Jiyong Wang, Zhou Zhou, Haitong Hou, Fred Chang, Scott P. Kallgren, Songtao Jia, Elizabeth A. Miller, and Tatiana Kurchuk
- Subjects
Nuclear Envelope ,Centromere ,Biology ,Spindle pole body ,03 medical and health sciences ,0302 clinical medicine ,Report ,Schizosaccharomyces ,Nuclear protein ,Mitosis ,Research Articles ,030304 developmental biology ,Genetics ,0303 health sciences ,integumentary system ,Centromere clustering ,Nuclear Proteins ,Chromosome ,Cell Biology ,biology.organism_classification ,Cell biology ,Schizosaccharomyces pombe Proteins ,SUN domain ,030217 neurology & neurosurgery - Abstract
Csi1 promotes centromere clustering by linking centromeres to the SUN domain protein Sad1 in the nuclear envelope., In the fission yeast Schizosaccharomyces pombe, the centromeres of each chromosome are clustered together and attached to the nuclear envelope near the site of the spindle pole body during interphase. The mechanism and functional importance of this arrangement of chromosomes are poorly understood. In this paper, we identified a novel nuclear protein, Csi1, that localized to the site of centromere attachment and interacted with both the inner nuclear envelope SUN domain protein Sad1 and centromeres. Both Csi1 and Sad1 mutants exhibited centromere clustering defects in a high percentage of cells. Csi1 mutants also displayed a high rate of chromosome loss during mitosis, significant mitotic delays, and sensitivity to perturbations in microtubule–kinetochore interactions and chromosome numbers. These studies thus define a molecular link between the centromere and nuclear envelope that is responsible for centromere clustering.
- Published
- 2012