HYS2, an essential gene required for DNA replication in Saccharomyces cerevisiae

Katsunori Sugimoto, Yoshitaka Sakamoto, Osamu Takahashi, Kunihiro Matsumoto

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42 Scopus citations


To investigate cell cycle regulation at the S or G2 phase in Saccharomyces cerevisiae, we have isolated mutants displaying supersensitivity to hydroxyurea (HU), a chemical that inhibits DNA replication. Such mutants, which we have named hydroxyurea sensitive (hys), defined four linkage groups and we characterized the hys2 mutation in this study. The hys2-1 mutant displays temperature sensitive growth and a constellation of phenotypes indicating defective DNA metabolism. At the restrictive temperature, hys2-1 cells arrest as large budded cells with a single nucleus at the neck of the bud and a short spindle. The hys2-1 mutant exhibits increased rates of chromosome loss and recombination. Additionally, hys2-1 appears to accumulate incompletely replicated DNA that can be detected by a pulse field electrophoresis assay. Finally, deletion of RAD9 in a hys2-1 strain decreases the percentage of arrested cells, suggesting that an intact RAD9-checkpoint is required for the cell cycle arrest in hys2-1 cells. HYS2 encodes a 55 kDa protein that is essential for viability at all temperatures. Taken together, these data suggest that Hys2 plays a role in DNA replication.

Original languageEnglish (US)
Pages (from-to)3493-3500
Number of pages8
JournalNucleic acids research
Issue number17
StatePublished - Sep 11 1995

All Science Journal Classification (ASJC) codes

  • Genetics


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