Detection of the DNA primary structure modifications induced by the base analog 6-n-hydroxylaminopurine in the alpha-test in yeast saccharomyces cerevisiae
- Authors: Zhuk A.S.1, Stepchenkova E.I.1,2, Inge-Vechtomov S.G.1,2
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Affiliations:
- ITMO University
- Vavilov Institute of General Genetics Russian Academy of Science
- Issue: Vol 18, No 3 (2020)
- Pages: 357-366
- Section: Genetic toxicology
- URL: https://journals.rcsi.science/ecolgenet/article/view/34581
- DOI: https://doi.org/10.17816/ecogen34581
- ID: 34581
Cite item
Abstract
Background. The alpha-test allows to detect inherited genetic changes of different types, as well as phenotypic expression of primary DNA lesions before the lesions are fixed by repair. Here we investigate ability of the alpha-test to detect base modifications induced by 6-N-hydroxylaminopurine (HAP) and determine frequency of inherited and non-inherited genetic changes in yeast strains treated with HAP.
Materials and methods. The alpha-test is based on mating type regulation and detects cell type switch from α to a in heterothallic yeast Saccharomyces cerevisiae. The frequency of mating type switching reflects level of both spontaneous and induced by a mutagen DNA instability. The alpha-test may be performed in two variants: “illegitimate” hybridization and cytoduction. Conducting both complementary tests and analysis of phenotypes of the “illegitimate” hybrids and cytoductants allows to detect the full spectrum of genetic events that lead to mating type switching, such as chromosome III loss and chromosome III arm loss, mutations and temporary lesions, recombination and conversion.
Results. HAP increases the frequency of illegitimate hybridization by 5-fold, and illegitimate cytoduction by 10-fold. A large proportion of the primary lesions induced by HAP causes temporary mating type switch and the remainder parts are converted into inherited point mutations.
Conclusion. The alpha-test can detect HAP-induced base modifications and may be used to investigate the ratio between correct and error-prone processing of such primary DNA lesions. Like other genetic toxicology tests the alpha-test has limitations, which are discussed.
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##article.viewOnOriginalSite##About the authors
Anna S. Zhuk
ITMO University
Author for correspondence.
Email: ania.zhuk@gmail.com
ORCID iD: 0000-0001-8926-8238
SPIN-code: 2223-5306
Scopus Author ID: 54953157500
ResearcherId: N-5270-2015
PhD, Researcher, Laboratory of Genomic Diversity, International Laboratory of Computer Technologies
Russian Federation, Saint PetersburgElena I. Stepchenkova
ITMO University; Vavilov Institute of General Genetics Russian Academy of Science
Email: stepchenkova@gmail.com
ORCID iD: 0000-0002-5854-8701
SPIN-code: 9121-7483
Scopus Author ID: 8862552900
ResearcherId: F-9931-2014
PhD, Head of Laboratory of Mutagenesis and Genetic Toxicology; Assistant, Department of Genetics and Biotechnology
Russian Federation, Saint PetersburgSergey G. Inge-Vechtomov
ITMO University; Vavilov Institute of General Genetics Russian Academy of Science
Email: ingevechtomov@gmail.com
SPIN-code: 3743-7626
Scopus Author ID: 23473232500
Doctor of Science, Director; Professor, Department of Genetics and Biotechnology
Russian Federation, Saint PetersburgReferences
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