1-Nitropyrene Efficiently Induces Mitotic Recombination in Saccharomyces cerevisiae
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- RHENIMI Lalla Rajaa
- Graduate School of Life Sciences, Tohoku University
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- ABU-NASR Naglaa Fathi
- Graduate School of Life Sciences, Tohoku University
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- YAMAMOTO Kazuo
- Graduate School of Life Sciences, Tohoku University
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Nitropyrene, a mutagenic and carcinogenic component of diesel exhaust, has been shown to be a potent bacterial and mammalian mutagen. There is, however, some controversy regarding the genotoxic effects of 1-nitropyrene towards yeast. To obtain insights into the mechanisms of 1-nitropyrene-induced mutations in Saccharomyces cerevisiae, we have attempted to characterize the genetic alterations that inactivate the endogenous CAN1 gene either in haploid cells or in heterozygous diploid cells. 1-Nitropyrene, without any activation treatment, showed a substantial toxic effect until 500 μM. The mutation frequency in haploid cells treated with 500 μM of 1-nitropyrene was 1.59 × 10-5, which is 15-fold higher than the control value. Sequencing of mutants indicated that both frameshifts and base substitutions were increased. In diploid cells treated with 500 μM of 1-nitropyrene, the frequency with which can1Δ::LEU2/can1Δ::LEU2 was converted from CAN1/can1Δ::LEU2, a phenotypic change from a canavanine-sensitive to canavanine-resistant form, was 8.59 × 10-4, which is 9.15-fold higher than the spontaneous level. More than 99% of the 1-nitropyrene-induced mutations in canavanine-resistant diploid cells constituted a gene conversion or crossover. Chromosome loss was not increased after treatment with 1-nitropyrene. These results suggest that 1-nitropyrene is an agent that efficiently induces point mutations, gene conversion, and crossover, but not chromosome loss, in S. cerevisiae.
収録刊行物
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- Journal of Radiation Research
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Journal of Radiation Research 49 (6), 615-622, 2008
Journal of Radiation Research 編集委員会
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詳細情報 詳細情報について
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- CRID
- 1390001205216068224
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- NII論文ID
- 110006985821
- 130000050856
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- NII書誌ID
- AA00705792
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- ISSN
- 13499157
- 04493060
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- NDL書誌ID
- 9710487
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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