Genetics, Vol 123, 45-54, Copyright © 1989


INVESTIGATIONS

Meiotic Recombination-Deficient Mutants of Schizosaccharomyces pombe

A. S. Ponticelli and G. R. Smith
Fred Hutchinson Cancer Research Center, Seattle, Washington 98104, and Department of Pathology, University of Washington, Seattle, Washington 98155 Present address: Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115.

A mutant screen employing the ade6-M26 recombination hotspot was developed and used to isolate Schizosaccharomyces pombe mutants deficient in meiotic recombination. Nine rec mutations were recessive, defining six complementation groups, and reduced ade6 meiotic recombination 3-fold to >/=300-fold when homozygous. Three recessive rec mutations analyzed further also reduced meiotic intragenic recombination at ura4 on chromosome III and intergenic recombination between pro2 and arg3 on chromosome I. The observed non-co-ordinate reductions of the recombinant frequencies in the three test intervals suggest a degree of locus (or intragenic vs. intergenic) specificity of the corresponding rec(+) gene products. None of the mutations specifically inactivated the ade6-M26 hotspot. Additional rec genes may be identified with these methods.


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