title: X-ray induction of persistent hypersensitivity to mutation.
abstract: The progeny of x-irradiated V79 cells are hypersensitive to PUVA-(8-methoxypsoralen plus longwave ultraviolet light) induced mutation at the locus for hypoxanthine-guanine phosphoribosyl transferase. This hypersensitivity is most evident at low doses of pUVA that do not induce mutation in non-x-irradiated cells. The hypersensitivity is evoked by x-irradiation delivered as a single dose or as multiple fractions over a long period and persists for at least 108 days of exponential growth. This radiation-induced hypersensitivity to subsequent mutation is a new phenomenon that may be relevant to multistage carcinogenesis.
mesh_terms: D000818:Animals; D002478:Cells, Cultured / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D007041:Hypoxanthine Phosphoribosyltransferase / Q000235:genetics; D009154:Mutation / Q000528:radiation effects*; D011701:PUVA Therapy / Q000009:adverse effects*; D010778:Photochemotherapy / Q000009:adverse effects*; D011839:Radiation, Ionizing; D014965:X-Rays
chemical_list: D007041:Hypoxanthine Phosphoribosyltransferase