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In meiosis, a single round of DNA replication is followed by two consecutive rounds of chromosome segregation, called meiosis I and II. Disjunction of maternal from paternal centromeres during meiosis I depends on the attachment of sister kinetochores to microtubules emanating from the same pole. In budding yeast, monopolar attachment requires recruitment to kinetochores of the monopolin complex. How monopolin promotes monopolar attachment was unclear, as its subunits are poorly conserved and lack similarities to proteins with known functions. We show here that the monopolin subunit Mam1 binds tightly to Hrr25, a highly conserved casein kinase 1 delta/epsilon (CK1delta/epsilon), and recruits it to meiosis I centromeres. Hrr25 kinase activity and Mam1 binding are both essential for monopolar attachment. Since CK1delta/epsilon activity is important for accurate chromosome segregation during meiosis I also in fission yeast, phosphorylation of kinetochore proteins by CK1delta/epsilon might be an evolutionary conserved process required for monopolar attachment.

Original publication




Journal article



Publication Date





1049 - 1064


ATP-Binding Cassette Transporters, Casein Kinase I, Centromere, Chromosomal Proteins, Non-Histone, Chromosome Segregation, DNA Replication, Kinetochores, Meiosis, Protein Subunits, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Schizosaccharomyces pombe Proteins, Spindle Apparatus