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Mutation analysis using the restriction site mutation (RSM) assay

G J Jenkins1, M H Chaleshtori, H Song

  • 1School of Biological Sciences, University of Wales Swansea, Singleton Park, Swansea, SA2 8PP, UK. g.j.jenkins@swansea.ac.uk

Mutation Research
|September 28, 1998
PubMed
Summary
This summary is machine-generated.

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The restriction site mutation (RSM) assay was enhanced for quantitative data and sensitivity, enabling the study of low-dose chemical exposures and mutation persistence in DNA. Intron mutations showed greater persistence after chemical treatment.

Area of Science:

  • Genetics
  • Molecular Biology
  • Toxicology

Background:

  • The restriction site mutation (RSM) assay detects genetic alterations in genomic DNA.
  • Initial limitations included lack of quantitative data and low sensitivity.
  • Enhancements were sought for studying low-dose chemical exposures.

Purpose of the Study:

  • To improve the RSM assay's quantitative capabilities and sensitivity.
  • To investigate the persistence of chemically induced mutations in vivo and in vitro.
  • To explore the relationship between DNA adducts and mutation induction.

Main Methods:

  • Incorporated an internal standard into PCR for quantitative data.
  • Utilized intron sequences for increased assay sensitivity.
  • Applied the enhanced RSM assay to N-ethyl-N-nitrosourea (ENU)-treated mouse testes and 4-nitroquinoline-1-oxide (4-NQO)-treated human fibroblasts.

Related Experiment Videos

  • Used 32P post-labelling for DNA adduct analysis.

    • Main Results:

    • Quantitative data and increased sensitivity were achieved in the RSM assay.
    • Intron mutations were more persistent than exon mutations following ENU treatment in mice.
    • RSM and adduct analysis in fibroblasts revealed early Taq polymerase-induced mutations and later in vivo processing mutations.
    • High spontaneous mutation levels complicated ENU-induced mutation assignment.

    Conclusions:

    • The enhanced RSM assay is suitable for studying low-dose chemical exposures.
    • Intron mutations exhibit greater persistence in the germline.
    • Distinguishing between in vitro and in vivo mutations is crucial for accurate genotoxicity assessment.