Genetics, Vol 132, 75-85, Copyright © 1992


INVESTIGATIONS

Meiotically Induced rec7 and rec8 Genes of Schizosaccharomyces pombe

Y. Lin, K. L. Larson, R. Dorer and G. R. Smith
Fred Hutchinson Cancer Research Center, Seattle, Washington 98104

The Schizosaccharomyces pombe rec7 and rec8 genes, which are required for meiotic intragenic recombination but not for mitotic recombination, have been cloned and their DNA sequences determined. Genetic and physical analyses demonstrated that the cloned fragments contained the rec genes rather than rec mutation suppressors. A 1.6-kb DNA fragment contained a functional rec7 gene, and a 2.1-kb fragment contained a functional rec8 gene. The nucleotide sequences of these fragments revealed open reading frames predicting 249 amino acids for the rec7 gene product and 393 amino acids for the rec8 gene product. Northern hybridization analysis showed that both rec gene mRNAs were detectable only at 2-3 hr after induction of meiosis. The absence of these mRNAs in mitosis and their disappearance at 4 hr and later in meiosis suggest that the rec7 and rec8 gene products may be involved primarily in the early steps of meiotic recombination in S. pombe.


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