title: Fission yeast Pds5 is required for accurate chromosome segregation and for survival after DNA damage or metaphase arrest.
abstract: Sister chromatid cohesion, which is established during the S phase of the eukaryotic cell cycle and persists until the onset of anaphase, is essential for the maintenance of genomic integrity. Cohesion requires the multi-protein complex cohesin, as well as a number of accessory proteins including Pds5/BIMD/Spo76. In the budding yeast Saccharomyces cerevisiae Pds5 is an essential protein that localises to chromosomes in a cohesin-dependent manner. Here we describe the characterisation in the fission yeast Schizosaccharomyces pombe of pds5(+), a novel, non-essential orthologue of S. cerevisiae PDS5. The S. pombe Pds5 protein was localised to punctate nuclear foci in a manner that was dependent on the Rad21 cohesin component. This, together with additional genetic evidence, points towards an involvement of S. pombe Pds5 in sister chromatid cohesion. S. pombe pds5 mutants were hypersensitive to DNA damage and to mitotic metaphase delay, but this sensitivity was apparently not due to precocious loss of sister chromatid cohesion. These cells also suffered increased spontaneous chromosome loss and meiotic defects and their viability was dependent on the spindle checkpoint protein Bub1. Thus, while S. pombe Pds5 has an important cohesin-related role, this differs significantly from that of the equivalent budding yeast protein.
authors.affiliation: Imperial Cancer Research Fund Molecular Oncology Laboratory, University of Oxford Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford OX3 9DS, UK.
authors.forename: Shao-Win
authors.initials: SW
authors.lastname: Wang
authors.forename: Rebecca L
authors.initials: RL
authors.lastname: Read
authors.forename: Chris J
authors.initials: CJ
authors.lastname: Norbury
mesh_terms: D000964:Antimetabolites, Antineoplastic / Q000494:pharmacology; D001761:Bleomycin / Q000494:pharmacology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002470:Cell Survival; D002868:Chromosomal Proteins, Non-Histone; D020090:Chromosome Segregation; D004249:DNA Damage; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D017930:Genes, Reporter; D008540:Meiosis / Q000502:physiology; D008677:Metaphase; D008938:Mitosis / Q000187:drug effects / Q000502:physiology*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D012568:Schizosaccharomyces / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D029702:Schizosaccharomyces pombe Proteins / Q000235:genetics / Q000378:metabolism*; D000097722:Cohesins
chemical_list: D000964:Antimetabolites, Antineoplastic; D001761:Bleomycin; 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; D000097722:Cohesins; C490529:MCD1 protein, S cerevisiae; C115842:MIS4 protein, S pombe; C092957:Rad21 protein, S pombe; C499666:pds5 protein, S pombe