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[Phenotypic variability in gag-myc transgenic mice]

L B Ginkul1, A N Ermilov, S M Mikulinskaia

  • 1Institute of Cytology, Russian Academy of Sciences.

Voprosy Onkologii
|January 13, 1999
PubMed
Summary

Transgenic mice with gag-myc oncogene develop tumors but show a narrower spectrum, mainly lymphomas and endocrine/exocrine tumors. Growth and body mass were unaffected by gag-myc incorporation.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Transgenic mouse models are crucial for studying oncogenesis.
  • The gag-myc oncogene's role in tumor development requires further investigation across generations.

Purpose of the Study:

  • To evaluate the neoplastic growth capacity and tumor spectrum in F3-F4 gag-myc transgenic mice.
  • To compare tumor development in F3-F4 generation with earlier generations (F0-F2).

Main Methods:

  • Generation and maintenance of gag-myc transgenic mouse lines.
  • Histopathological analysis of tumors developed in F3-F4 transgenic mice.
  • Assessment of quantitative polygenic characteristics like body mass and growth.

Main Results:

  • F3-F4 gag-myc transgenic mice retained the capacity for hyperplasia and tumor development, similar to F0-F2 mice.
  • The histological spectrum of tumors in F3-F4 mice was significantly narrower, lacking rare patterns observed in earlier generations.
  • Predominant tumors in F3-F4 mice included lymphomas and epithelial tumors of endocrine or exocrine glands.
  • gag-myc incorporation did not influence quantitative traits such as body mass and growth.

Conclusions:

  • The gag-myc oncogene drives tumor formation but its expression in later generations leads to a restricted tumor phenotype.
  • Tumorigenesis in gag-myc transgenic models is influenced by genetic background and potentially epigenetic modifications across generations.
  • Quantitative polygenic traits are independent of gag-myc oncogene expression in this model.

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