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The frequency of meiotic recombination in yeastis independent of the number and position of homologous donor sequences: implications for chromosome pairing

By James E. Haber, Wai-Ying Leung, Rhona H. Borts and Michael Lichten


Full-text of this article is not available on the LRA. The published version is available from the publisher's website at http://www.pnas.org/content/by/yearWe constructed diploids of Saccharomyces cerevisiae homozygous for LEU2 and carrying one, two, or four copies of leu2 at ectopic locations and determined the frequency of 3+:1- (LEU2:leu2) meiotic tetrads. Gene conversion between a LEU2 recipient and a leu2 ectopic donor occurred at the same frequency as did gene conversion between allelic copies of LEU2 and leu2. An increase in the number of possible ectopic donor loci did not lead to a proportional increase in the level of ectopic gene conversion. We suggest that the limiting step in meiotic recombination is the activation of a locus to become a recipient in recombination and that once activated, a locus can search the entire genome for a homologous partner with which to recombine. In this respect, this search for a homologous partner resembles the efficient premeiotic methylation/inactivation of duplicated sequences in Ascobolus and Neurospora. These observations support models in which strand exchange serves to align homologous chromosomes prior to their becoming much more fully synapsed by the elaboration of the synaptonemal complex

Publisher: National Academy of Sciences
Year: 1991
OAI identifier: oai:lra.le.ac.uk:2381/8903
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