Related Experiment Videos
The effect of spermine on spontaneous and UV-induced mutations in Schizosaccharomyces pombe
Abstract:
The effect of different concentrations of spermine on spontaneous and UV-induced mutation in the adenine forward mutation system of Schizosaccharomyces pombe was investigated. The effect of spermine on spontaneous mutation was studied in 5 mutator strains (mut 1-4, mut 1-23, mut 2-9, mut 2-20 and mut 3-21) and on UV-induced mutation in a pigmented adenine-requiring strain and its radiation-sensitive derivative (rad 13). The effect of spermine exposure on mutation induction before and after UV irradiation was also investigated. Spermine increased spontaneous forward mutation in the mut 1-4 strain by 47%, and enhanced UV-induced forward mutation 2-fold in the rad 13 and normal pigmented strains. No antimutagenic effect of spermine was seen in any of the strains tested. This is in marked contrast to the antimutagenic effect of spermine observed with bacteria.
Insights
Spermine, a polyamine, increased spontaneous mutations in yeast strains and enhanced UV-induced mutations. Unlike in bacteria, spermine did not show antimutagenic effects in this study on Schizosaccharomyces pombe.
Area of Science:
- Molecular Biology
- Genetics
- Yeast Research
Background:
- Spermine is a polyamine with known biological functions.
- Previous studies suggested spermine possesses antimutagenic properties in bacteria.
- The mutagenic and antimutagenic effects of spermine in yeast were not well-characterized.
Purpose of the Study:
- To investigate the effect of spermine on spontaneous and UV-induced mutations in Schizosaccharomyces pombe.
- To compare spermine's effects in yeast with its known effects in bacteria.
- To evaluate potential antimutagenic activity of spermine in yeast.
Main Methods:
- Utilized the adenine forward mutation system in Schizosaccharomyces pombe.
- Tested spermine's effect on spontaneous mutation in five distinct mutator strains.
- Assessed spermine's impact on UV-induced mutation in a pigmented strain and its radiation-sensitive derivative (rad13).
- Examined spermine exposure timing relative to UV irradiation.
Main Results:
- Spermine significantly increased spontaneous forward mutation by 47% in the mut 1-4 yeast strain.
- Spermine enhanced UV-induced forward mutation two-fold in both normal pigmented and rad13 yeast strains.
- No evidence of an antimutagenic effect of spermine was observed in any tested yeast strain.
Conclusions:
- Spermine acts as a mutagen, not an antimutagen, in the investigated Schizosaccharomyces pombe system.
- These findings contrast sharply with previously reported antimutagenic effects of spermine in bacterial systems.
- Further research is needed to elucidate the differential mechanisms of spermine action across species.