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Related Experiment Videos

UV-light induces delayed mutations in Chinese hamster cells

T D Stamato1, E Richardson, M L Perez

  • 1Lankenau Medical Research Center, Wynnewood, PA 19096, USA.

Mutation Research
|May 1, 1995
PubMed
Summary

Ultraviolet (UV) light can delay mutations at the glucose 6-phosphate dehydrogenase (G6PD) locus in Chinese hamster cells for up to 11 cell divisions. This suggests UV-induced DNA alterations can increase spontaneous mutation frequency long-term.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Mutations are crucial for understanding DNA damage and repair mechanisms.
  • Investigating delayed mutations helps elucidate the long-term effects of mutagens.

Purpose of the Study:

  • To determine if UV light can induce delayed mutational events at the G6PD locus.
  • To quantify the timing of these delayed mutations in Chinese hamster cells.

Main Methods:

  • Chinese hamster cells were exposed to UV light.
  • Cells from single colonies were replated 5-7 days post-irradiation.
  • Resulting colonies were stained for glucose 6-phosphate dehydrogenase (G6PD) activity to identify mutants.

Main Results:

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  • Eight G6PD-negative mutant colonies were identified from 1657 treated colonies.
  • Mutations were detected up to the eleventh cell division after UV exposure.
  • Isolated G6PD-mutant cells showed stable genetic character with reduced G6PD activity.

    • Conclusions:

    • UV light can induce delayed mutations in mammalian cells for at least 11 cell generations.
    • Mutagens may induce long-term DNA alterations that elevate spontaneous mutation frequency.