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Pre-meiotic S phase is linked to reductional chromosome segregation and recombination.

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  • معلومة اضافية
    • المصدر:
      Publisher: Nature Publishing Group Country of Publication: England NLM ID: 0410462 Publication Model: Print Cited Medium: Print ISSN: 0028-0836 (Print) Linking ISSN: 00280836 NLM ISO Abbreviation: Nature Subsets: MEDLINE
    • بيانات النشر:
      Publication: Basingstoke : Nature Publishing Group
      Original Publication: London, Macmillan Journals ltd.
    • الموضوع:
      Chromosome Segregation* ; Phosphoproteins* ; Recombination, Genetic* ; S Phase* ; Schizosaccharomyces pombe Proteins*; Meiosis/*genetics ; Schizosaccharomyces/*genetics; Chromosomes, Fungal ; DNA Replication ; DNA, Fungal/biosynthesis ; Fungal Proteins/genetics ; Fungal Proteins/physiology ; Genes, Fungal ; Recombinant Fusion Proteins/genetics ; Recombinant Fusion Proteins/metabolism
    • نبذة مختصرة :
      Meiosis is initiated from G1 of the cell cycle and is characterized by a pre-meiotic S phase followed by two successive nuclear divisions. The first of these, meiosis I, differs from mitosis in having a reductional pattern of chromosome segregation. Here we show that meiosis can be initiated from G2 in fission yeast cells by ectopically activating the meiosis-inducing network. The subsequent meiosis I occurs without a pre-meiotic S phase and with decreased recombination, and exhibits a mitotic pattern of equational chromosome segregation. The subsequent meiosis II results in random chromosome segregation. This behaviour is similar to that observed in cells lacking the meiotic cohesin Rec8 (refs 3, 4), which becomes associated with chromosomes at G1/S phase, including the inner centromere, a region that is probably critical for sister-centromere orientation. If the expression of Rec8 is delayed to S phase/G2, then the centromeres behave equationally. We propose that the presence of Rec8 in chromatin is required at the pre-meiotic S phase to construct centromeres that behave reductionally and chromosome arms capable of a high level of recombination, and that this explains why meiosis is initiated from G1 of the cell cycle.
    • الرقم المعرف:
      0 (DNA, Fungal)
      0 (Fungal Proteins)
      0 (Phosphoproteins)
      0 (Recombinant Fusion Proteins)
      0 (Schizosaccharomyces pombe Proteins)
      148813-46-1 (REC8 protein, S pombe)
    • الموضوع:
      Date Created: 20010224 Date Completed: 20010215 Latest Revision: 20031114
    • الموضوع:
      20250114
    • الرقم المعرف:
      10.1038/35053103
    • الرقم المعرف:
      11201746