Analysis of meiotic recombination pathways in the yeast Saccharomyces cerevisiae.
In the yeast, Saccharomyces cerevisiae, several genes appear to act early in meiotic recombination. HOP1 and RED1 have been classified as such early genes. The data in this paper demonstrate that neither a red nor a hop1 mutation can rescue the inviable spores produced by a rad52 spo13 strain; this phenotype helps to distinguish these two genes from other early meiotic recombination genes such as SPO11, REC104, or MEI4. In contrast, either a red1 or a hop1 mutation can rescue a rad50S spo13 strain; this phenotype is similar to that conferred by mutations in the other early recombination genes (e.g., REC104). These two different results can be explained because the data presented here indicate that a rad50S mutation does not diminish meiotic intrachromosomal recombination, similar to the mutant phenotypes conferred by red1 or hop1. Of course, RED1 and HOP1 do act in the normal meiotic interchromosomal recombination pathway; they reduce interchromosomal recombination to approximately 10% of normal levels. We demonstrate that a mutation in a gene (REC104) required for initiation of exchange is completely epistatic to a mutation in RED1. Finally, mutations in either HOP1 or RED1 reduce the number of double-strand breaks observed at the HIS2 meiotic recombination hotspot.
Mao-Draayer
Y
Y
Department of Biological Sciences, University of Iowa, Iowa City 52242, USA.
Galbraith
A M
AM
Pittman
D L
DL
Cool
M
M
Malone
R E
RE
D015825:Chromosomes, Fungal; D004268:DNA-Binding Proteins / Q000235:genetics*; D005656:Fungal Proteins / Q000235:genetics*; D015966:Gene Expression Regulation, Fungal; D010641:Phenotype; D051721:Rad52 DNA Repair and Recombination Protein; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D013172:Spores, Fungal / Q000502:physiology
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C086672:HOP1 protein, S cerevisiae; C086930:RAD50 protein, S cerevisiae; C497197:RAD52 protein, S cerevisiae; C086673:RED1 protein, S cerevisiae; D051721:Rad52 DNA Repair and Recombination Protein; C097192:SPO13 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins