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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A conditional allele of the Saccharomyces cerevisiae HOP1 gene is suppressed by overexpression of two other meiosis-specific genes: RED1 and REC104.

The HOP1 gene of Saccharomyces cerevisiae is believed to encode a protein component of the synaptonemal complex, the structure formed when homologous chromosomes synapse during meiotic prophase. Five new mutant alleles (three conditional, two nonconditional) of HOP1 were identified by screening EMS-mutagenized cells for a failure to complement the spore viability defect of a hop1 null allele. Two high copy plasmids were found that partially suppress the temperature-sensitive spore inviability phenotype of one of these alleles, hop1-628. The suppression is allele-specific; no effect of the plasmids is observed in hop1 null diploids. Mutation of either of the two suppressor genes results in recessive spore lethality, indicating that these genes play important roles during meiosis. The DNA sequence of one high copy suppressor gene matched that of RED1, a previously identified meiosis-specific gene. Our data strongly support the idea that RED1 protein is also a component of the synaptonemal complex and further suggest that the RED1 and HOP1 gene products may interact. The second suppressor maps to the right arm of chromosome VIII distal to CDC12 and is REC104, a meiosis-specific gene believed to act early in meiosis.[1]


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