Unusual nuclear structures in meiotic prophase of fission yeast: a cytological analysis

doi:10.1083/jcb.121.2.241

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Unusual nuclear structures in meiotic prophase of fission yeast: a cytological analysis

J Bahler, T Wyler, J Loidl and J Kohli
Institute of General Microbiology, University of Bern, Switzerland.

Earlier results from sectioned nuclei indicating that Schizosaccharomyces pombe does not develop a classical tripartite synaptonemal complex (SC) during meiotic prophase are confirmed by spreading of whole nuclei. The linear elements appearing during prophase I resemble the axial cores (SC precursors) of other organisms. The number of linear elements in haploid, diploid, and tetraploid strains is always higher than the chromosome number, implying that they are not formed continuously along the chromosomes. Time course experiments reveal that the elements appear after DNA replication and form networks and bundles. Later they separate and approximately 24 individual elements with a total length of 34 microns are observed before degradation and meiotic divisions. Parallel staining of DNA reveals changes in nuclear shape during meiotic prophase. Strains with a mei4 mutation are blocked at a late prophase stage. In serial sections we additionally observed a constant arrangement of the spindle pole body, the nucleolus, and the presumptive centromere cluster. Thus, S. pombe manages to recombine and segregate its chromosomes without SC. This might correlate with the absence of crossover interference. We propose a mechanism for chromosome pairing with initial recognition of the homologs at the centromeres and suggest functions of the linear elements in preparation of the chromosomes for meiosis I disjunction. With the spreading technique combined genetic, molecular, and cytological approaches become feasible in S. pombe. This provides an opportunity to study essential meiotic functions in the absence of SCs which may help to clarify the significance of the SC and its components for meiotic chromosome structure and function.
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