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The orderly reduction in chromosome number that occurs during meiosis depends on two aspects of chromosome behavior specific to the first meiotic division. These are the retention of cohesion between sister centromeres and their attachment to microtubules that extend to the same pole (monopolar attachment). By deleting genes that are upregulated during meiosis, we identified in Saccharomyces cerevisiae a kinetochore associated protein, Mam1 (Monopolin), which is essential for monopolar attachment. We also show that the meiosis-specific cohesin, Rec8, is essential for maintaining cohesion between sister centromeres but not for monopolar attachment. We conclude that monopolar attachment during meiosis I requires at least one meiosis-specific protein and is independent of the process that protects sister centromere cohesion.

Type

Journal article

Journal

Cell

Publication Date

22/12/2000

Volume

103

Pages

1155 - 1168

Keywords

Anaphase, Cell Cycle Proteins, Chromosomal Proteins, Non-Histone, Chromosome Segregation, Chromosomes, Fungal, Fungal Proteins, Genetic Testing, Genome, Fungal, Kinetochores, Meiosis, Nuclear Proteins, Phosphoproteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Schizosaccharomyces pombe Proteins