Radiation-induced genetic instability in vivo depends on p53 status

Li Liang, Changshun Shao, Li Deng, Marc S. Mendonca, Peter J. Stambrook, Jay A. Tischfield

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

In response to ionizing radiation and other agents that damage DNA, the p53 tumor suppressor protein activates multiple cellular processes including cell cycle checkpoints and programmed cell death. Although loss of p53 function is associated with radiation-induced genetic instability in cell lines, it is not clear if this relationship exists in vivo. To study the role of p53 in maintenance of genetic stability in normal tissues following irradiation, we have measured mutant frequencies at the adenine phosphoribosyltransferase (Aprt) and hypothanine-guanine phosphoribosyltransferase (Hprt) loci and examined mechanisms of loss of heterozygosity (LOH) in normal T cells of p53-deficient, Aprt heterozygous mice that were subjected to whole-body irradiation with a single dose of 4Gy X-rays. The radiation-induced mutant frequency at both the Aprt and Hprt loci was elevated in cells from mice with different p53 genotypes. The radiation-induced elevation of p53-/- mice was significantly greater than that of p53+/- or p53+/+ mice and was caused by several different kinds of mutational events at the both chromosomal and intragenic levels. Most significantly, interstitial deletion, which occurs rarely in unirradiated mice, became the most common mechanism leading to LOH in irradiated p53 null mice. These observations support the idea that absence or reduction of p53 expression enhances radiation-induced tumorigenesis by increasing genetic instability at various loci, such as those for tumor suppressor genes.

Original languageEnglish (US)
Pages (from-to)69-80
Number of pages12
JournalMutation Research - Fundamental and Molecular Mechanisms of Mutagenesis
Volume502
Issue number1-2
DOIs
StatePublished - May 22 2002

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Radiation Genetics
Adenine Phosphoribosyltransferase
Hypoxanthine Phosphoribosyltransferase
Loss of Heterozygosity
Radiation
Tumor Suppressor Protein p53
Whole-Body Irradiation
Cell Cycle Checkpoints
Ionizing Radiation
Tumor Suppressor Genes
DNA Damage
Carcinogenesis
Cell Death
Genotype
Maintenance
X-Rays
T-Lymphocytes
Cell Line

Keywords

  • Genetic instability
  • In vivo LOH
  • Ionizing radiation
  • p53

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Molecular Biology

Cite this

Radiation-induced genetic instability in vivo depends on p53 status. / Liang, Li; Shao, Changshun; Deng, Li; Mendonca, Marc S.; Stambrook, Peter J.; Tischfield, Jay A.

In: Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, Vol. 502, No. 1-2, 22.05.2002, p. 69-80.

Research output: Contribution to journalArticle

Liang, Li ; Shao, Changshun ; Deng, Li ; Mendonca, Marc S. ; Stambrook, Peter J. ; Tischfield, Jay A. / Radiation-induced genetic instability in vivo depends on p53 status. In: Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis. 2002 ; Vol. 502, No. 1-2. pp. 69-80.
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