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Activation of a c-K-ras oncogene by somatic mutation in mouse lymphomas induced by gamma radiation

Journal Article · · Science (Washington, D.C.); (United States)
; ; ;

Mouse tumors induced by gamma radiation are a useful model system for oncogenesis. DNA from such tumors contains an activated K-ras oncogene that can transform NIH 3T3 cells. This report describes the cloning of a fragment of the mouse K-ras oncogene containing the first exon from both a transformant in rat-2 cells and the brain of the same mouse that developed the tumor. Hybrid constructs containing one of the two pieces were made and only the plasmid including the first exon from the transformant gave rise to foci in NIH 3T3 cells. There was only a single base difference (G----A) in the exonic sequence, which changed glycine to aspartic acid in the transformant. By use of a synthetic oligonucleotide the presence of the mutation was demonstrated in the original tumor, ruling out modifications during DNA-mediated gene transfer and indicating that the alteration was present in the thymic lymphoma but absent from other nonmalignant tissue. The results are compatible with gamma radiation being a source of point mutations.

Research Organization:
New York Univ. Medical Center, New York
OSTI ID:
6240247
Journal Information:
Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Vol. 225:4667; ISSN SCIEA
Country of Publication:
United States
Language:
English

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Related Subjects

560121* -- Radiation Effects on Cells-- External Source-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMAL CELLS
ANIMALS
CELL CONSTITUENTS
CLONING
DISEASES
DNA
ELECTROMAGNETIC RADIATION
GAMMA RADIATION
GENES
IONIZING RADIATIONS
MAMMALS
MICE
MUTATIONS
NEOPLASMS
NUCLEIC ACIDS
ONCOGENIC TRANSFORMATIONS
ORGANIC COMPOUNDS
PLASMIDS
RADIATIONS
RADIOINDUCTION
RODENTS
TUMOR CELLS
VERTEBRATES