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The novel gene trs1 encodes an essential protein for the transition from mitotic cell cycle to resting state in Schizosaccharomyces pombe.

A novel gene trs1 in the fission yeast Schizosaccharomyces pombe has been genetically defined. The trs1 mutant showed several intriguing phenotypes. Cells were sensitive to starvation and rapidly lost viability in the stationary phase; cells in the stationary phase were sensitive to heat shock. Some heat-shock proteins were not induced and the heat-shock response in log-phase cells was defective. These mutant phenotypes strongly suggest a vital function of the trs1 gene product for transition from the G1 to G0 phase on starvation and for the normal heat-shock response.