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Meiotic chromosome pairing involves not only recognition of homology but also juxtaposition of entire chromosomes in a topologically regular way. Analysis of filamentous fungus Sordaria macrospora reveals that recombination proteins Mer3, Msh4, and Mlh1 play direct roles in all of these aspects, in advance of their known roles in recombination. Absence of Mer3 helicase results in interwoven chromosomes,...
During meiosis, the number of crossovers, or their cytological correlates, chiasmata, vary in striking correlation to the length of prophase chromosome axes at the synaptonemal complex stage. Both parameters vary, and vary coordinately, among different individuals, strains or sexes, even when DNA length is effectively constant. Co-variation could be established either: (i) at or prior to recombination...
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