Direct demonstration of genetic alterations at the dihydrofolate reductase locus after gamma irradiation.
1982
Gamma ray-induced mutants of Chinese hamster ovary cells lacking dihydrofolate reductase activity were screened for DNA sequence changes at the locus specifying this activity by using a cloned cDNA probe. Two of nine mutants screened displayed an altered restriction fragment pattern suggesting the occurrence of DNA deletions or rearrangements.
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