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Mps1p regulates meiotic spindle pole bod ... novel roles during sporulation
Mps1p regulates meiotic spindle pole body duplication in addition to having novel roles during sporulation.
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Sporulation in yeast requires that a modified form of chromosome segregation be coupled to the development of a specialized cell type, a process akin to gametogenesis. Mps1p is a dual-specificity protein kinase essential for spindle pole body (SPB) duplication and required for the spindle assembly checkpoint in mitotically dividing cells. Four conditional mutant alleles of MPS1 disrupt sporulation, producing two distinct phenotypic classes. Class I alleles of mps1 prevent SPB duplication at the restrictive temperature without affecting premeiotic DNA synthesis and recombination. Class II MPS1 alleles progress through both meiotic divisions in 30-50% of the population, but the asci are incapable of forming mature spores. Although mutations in many other genes block spore wall formation, the cells produce viable haploid progeny, whereas mps1 class II spores are unable to germinate. We have used fluorescently marked chromosomes to demonstrate that mps1 mutant cells have a dramatically increased frequency of chromosome missegregation, suggesting that loss of viability is due to a defect in spindle function. Overall, our cytological data suggest that MPS1 is required for meiotic SPB duplication, chromosome segregation, and spore wall formation.
Straight PD, Giddings TH, Winey M
Molecular biology of the cell
2000-10-01 00:00
11
10
3525-37
Chromosomes, Fungal,DNA Replication,Genotype,Meiosis,Mitotic Spindle Apparatus,Phenotype,Protein-Serine-Threonine Kinases,Protein-Tyrosine Kinases,Recombination, Genetic,Saccharomyces cerevisiae,Saccharomyces cerevisiae Proteins,Spores, Fungal,Saccharomyces cerevisiae Proteins,MPS1 protein, S cerevisiae,Protein-Tyrosine Kinases,Protein-Serine-Threonine Kinases
Molecular, Cellular, and Developmental-Biology, Porter Biosciences, University of Colorado, Boulder, Colorado 80309, USA
Mol. Biol. Cell
NIGMS GM-07135
1059-1524
1260
True
11029053
