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. 2001 Feb;157(2):545–556. doi: 10.1093/genetics/157.2.545

Coupling of Saccharomyces cerevisiae early meiotic gene expression to DNA replication depends upon RPD3 and SIN3.

T M Lamb 1, A P Mitchell 1
PMCID: PMC1461525  PMID: 11156977

Abstract

It has been established that meiotic recombination and chromosome segregation are inhibited when meiotic DNA replication is blocked. Here we demonstrate that early meiotic gene (EMG) expression is also inhibited by a block in replication. Since early meiotic genes are required to promote meiotic recombination and DNA division, the low expression of these genes may contribute to the block in meiotic progression. We have identified three Hur- (HU reduced recombination) mutants that fail to couple meiotic recombination and gene expression with replication. One of these mutations is in RPD3, a gene required to maintain meiotic gene repression in mitotic cells. Complete deletions of RPD3 and the repression adapter SIN3 permitted recombination and early meiotic gene expression when replication was inhibited with hydroxyurea (HU). Biochemical analysis showed that the Rpd3p-Sin3p-Ume6p repression complex does exist in meiotic cells. These observations suggest that repression of early meiotic genes by SIN3 and RPD3 is critical for the normal response to inhibited replication. A second response to inhibited replication has also been discovered. HU-inhibited replication reduced the accumulation of phospho-Ume6p in meiotic cells. Phosphorylation of Ume6p normally promotes interaction with the meiotic activator Ime1p, thereby activating EMG expression. Thus, inhibited replication may also reduce the Ume6p-dependent activation of EMGs. Taken together, our data suggest that both active repression and reduced activation combine to inhibit EMG expression when replication is inhibited.

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Selected References

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