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Solid tissues removed from ATM homozygous deficient mice do not exhibit a mutator phenotype for second-step autosomal

M S Turker1, B M Gage, J A Rose

  • 1Center for Research on Occupational and Environmental Toxicology, Oregon Health Sciences University, Portland 97201, USA. turkerm@ohsu.edu

Cancer Research
|October 16, 1999
PubMed

Insights

Ataxia-telangiectasia (A-T) cells are thought to have a mutator phenotype due to ATM protein

Area of Science:

  • Genetics
  • Cancer Biology
  • Molecular Biology

Background:

  • Ataxia-telangiectasia (A-T) is associated with increased cancer risk.
  • The ATM protein is crucial for DNA damage detection.
  • A-T cells are hypothesized to exhibit a mutator phenotype.

Purpose of the Study:

  • To investigate the presence of a mutator phenotype in Atm-deficient cells.
  • To examine the frequency of autosomal mutations in solid tissues of Atm-deficient mice.

Main Methods:

  • Generation of mice with knockout mutations for Aprt and Atm loci.
  • Analysis of second-step autosomal mutations in ear (mesenchymal) and kidney (epithelial) tissues.
  • Assessment of inactivating autosomal mutations in Atm-deficient cells.

Main Results:

  • No evidence of a mutator phenotype was found in Atm-deficient mice.
  • The frequency of inactivating autosomal mutations was not increased in solid tissues.
  • This study challenges the mutator phenotype assumption in Atm-deficient solid tissues.

Conclusions:

  • Atm deficiency does not confer a mutator phenotype in the examined solid tissues.
  • The study provides crucial data on the role of ATM in maintaining genomic stability.
  • Further research is needed to understand the mechanisms behind A-T cancer predisposition.

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