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Mol Cell Biol. 1988 March; 8(3): 1132-1136

Expression of the yeast UB14 gene increases in response to DNA-damaging agents and in meiosis.

Department of Biological Chemistry, School of Medicine, University of California, Los Angeles 90024.

ABSTRACT

The polyubiquitin gene, UB14, of Saccharomyces cerevisiae is regulated by a variety of environmental stresses and physiological conditions. After exposure of rapidly growing yeast cells to DNA-damaging agents (4-nitroquinoline-1-oxide and N-methyl-N'-nitro-N-nitrosoguanidine), intracellular levels of UB14 transcript increased rapidly. Induction of UB14 transcripts occurred within 30 to 60 min of exposure to 4-nitroquinoline-1-oxide in RAD+, rad52, and rad6 repair-deficient yeast strains. In high-density RAD+ cultures, the effect of alkylating agents on UB14 transcript levels is attenuated, in part because of significant increases in the basal level of this message in untreated cells. We also observed that the levels of UB14 transcripts increased significantly when diploid cells were exposed to sporulation conditions. Maximal levels of UB14 transcripts were reached after 6 to 8 h in sporulation medium. Accumulation of UB14 transcripts occurred in a/alpha diploids that undergo meiosis but not in asporogenous alpha/alpha diploids exposed to the same nutritional conditions.

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