Functional genomics identifies monopolin: a kinetochore protein required for segregation of homologs during meiosis i.
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.
Tóth
A
A
Research Institute of Molecular Pathology, Dr. Bohr Gasse 7, Vienna, Austria A-1030.
Rabitsch
K P
KP
Gálová
M
M
Schleiffer
A
A
Buonomo
S B
SB
Nasmyth
K
K
D000705:Anaphase / Q000502:physiology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D002868:Chromosomal Proteins, Non-Histone; D020090:Chromosome Segregation / Q000502:physiology*; D015825:Chromosomes, Fungal / Q000502:physiology; D005656:Fungal Proteins / Q000032:analysis* / Q000235:genetics* / Q000378:metabolism; D005820:Genetic Testing; D016681:Genome, Fungal; D018386:Kinetochores / Q000737:chemistry*; D008540:Meiosis / Q000502:physiology*; D009687:Nuclear Proteins; D010750:Phosphoproteins; D012441:Saccharomyces cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; D000097722:Cohesins
D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; D005656:Fungal Proteins; D009687:Nuclear Proteins; D010750:Phosphoproteins; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; C490529:MCD1 protein, S cerevisiae; C077081:REC8 protein, S pombe; D000097722:Cohesins