It is shown that caffeine antagonizes petite-induction with ethidium bromide under non-growth conditions when administered during or after mutagenic treatment. Caffeine itself is shown to be a petite-inducing agent when cells are grown in liquid glucose-complete-medium in the presence of the drug. A
Effect of caffeine on ozone-sensitivity in Saccharomyces cerevisiae
✍ Scribed by Dubeau, Hélène ;Chung, Young Sup
- Publisher
- Springer
- Year
- 1984
- Tongue
- English
- Weight
- 218 KB
- Volume
- 195
- Category
- Article
- ISSN
- 0026-8925
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✦ Synopsis
The addition of 0.1% caffeine to the plating medium markedly reduced the ozone-survival of the wild-type and the rad1 and rad6 mutants of Saccharomyces cerevisiae, whereas no effect was observed in the rad52 mutant. Since, in S. cerevisiae, caffeine has been reported to interfere with the recombinational repair pathway under the control of the RAD52 gene, these results support previous observations suggesting that this pathway is involved in the repair of ozone-induced DNA damage.
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The mitochondrial mutation petite was induced in yeast cells by ethidium bromide (EB), Adriamycin (ADR) and 4-nitroquinoline-N-oxide (NQO). In the presence of aspirin in concentrations ranging from 0.1 to 1.0 mg/ml, the mutagenicity of EB and ADR was reversed but petite induction by NQO was unaffect