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Related Experiment Videos

An oxygen dependence in chromium mutagenesis.

K D Sugden1, R B Burris, S J Rogers

  • 1Department of Biochemistry, Montana State University, Bozeman 59715.

Mutation Research
|July 1, 1990
PubMed
Summary

Chromium compounds show differential mutagenicity in Salmonella bacteria, influenced by oxygen levels. This study reveals distinct oxygen dependencies for chromium(VI) and chromium(III) in causing mutations.

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Area of Science:

  • Environmental toxicology
  • Molecular biology
  • Genetics

Background:

  • Chromium compounds are known environmental contaminants.
  • The mutagenic mechanisms of different chromium oxidation states are not fully understood.
  • Oxygen's role in chromium-induced DNA damage requires further investigation.

Purpose of the Study:

  • To investigate the differential mutagenicity of chromium(VI) and chromium(III) compounds in Salmonella.
  • To determine the influence of oxygen presence or absence on chromium-mediated mutagenesis.
  • To explore the potential role of oxygen radicals in the mutagenic pathways of chromium.

Main Methods:

  • Bacterial reverse mutation assays using Salmonella strains TA102 and TA2638.
  • Testing mutagenicity under both aerobic and anaerobic conditions.
  • Utilizing specific chromium(VI) (potassium dichromate) and chromium(III) (cis-dichlorobis(2,2'-bipyridyl)chromium(III)) compounds.

Main Results:

  • The chromium(III) compound demonstrated mutagenicity only under aerobic conditions.
  • Potassium dichromate (chromium VI) required oxygen for mutagenicity in strain TA102 but showed some activity anaerobically in TA2638.
  • Mutagenesis by chromium compounds appears to involve oxygen radicals, suggesting multiple pathways.

Conclusions:

  • Oxygen availability significantly modulates the mutagenic potential of chromium(VI) and chromium(III) compounds.
  • Oxygen radicals likely play a role in chromium-induced mutagenesis.
  • At least two distinct mechanisms contribute to chromium compound mutagenicity in bacteria.

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