Southern blot and polymerase chain reaction exon analyses of HPRT[sup [minus]] mutations induced by radon and radon progeny
- Pacific Northwest Labs., Richland, WA (United States)
- Whitman College, Walla Walla, WA (United States)
- Kaiser Permanente Regional Medical Center, Los Angeles, CA (United States)
A linear dose response was observed for radon-induced mutations at the CHO-hprt locus with an induction frequency of 1.4 x 10[sup [minus]4] mutants per viable cell per gray. Mutants isolated after two levels of radon exposure were evaluated using Southern blot techniques and polymerase chain reaction (PCR) exon amplification. No significant differences in mutational spectra were detected at these two exposure levels. Of 52 radon-induced mutations, 48% sustained a gene deletion, 23% underwent a rearrangement of the banding patterns or loss of one or more exons, and 29% showed no change from the parental line. These mutants were compared with mutants produced after X irradiation (3 Gy) and with spontaneous mutants from untreated cells. The spectra of mutation types in cells treated with radon and X rays were not significantly different. In contrast, 31 spontaneous mutations exhibited a low percentage of gene deletion events (16%); most spontaneous mutants showed no change (74%); the remaining 10% were classified as alterations. In conclusion, the principal lesion seen at the CHO-hprt locus after radiation exposure is gene deletion, while the predominant class of spontaneous mutations is composed of smaller events not detectable by Southern blot or PCR exon analysis. 26 refs., 4 figs., 1 tab.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6440448
- Journal Information:
- Radiation Research; (United States), Journal Name: Radiation Research; (United States) Vol. 137:3; ISSN 0033-7587; ISSN RAREAE
- Country of Publication:
- United States
- Language:
- English
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550400 -- Genetics
560120* -- Radiation Effects on Biochemicals
Cells
& Tissue Culture
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMAL CELLS
CHO CELLS
COMPARATIVE EVALUATIONS
DAUGHTER PRODUCTS
DOSE-RESPONSE RELATIONSHIPS
DOSES
ELECTROMAGNETIC RADIATION
ELEMENTS
EVALUATION
FLUIDS
GASES
GENE AMPLIFICATION
GENE MUTATIONS
GENETICALLY SIGNIFICANT DOSE
IONIZING RADIATIONS
ISOTOPES
MUTATIONS
NONMETALS
POLYMERASE CHAIN REACTION
RADIATION DOSES
RADIATIONS
RADIOINDUCTION
RADON
RARE GASES
SPONTANEOUS MUTATIONS
X RADIATION