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JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Radiation-induced mutations at the autosomal thymidine kinase locus are not elevated in p53-null cells.
Cancer Research 1999 July 2
To explore further the possibility that some forms of mutated p53 may increase mutagenesis in a positive manner, a double p53 knockout cell line was created, using a promoterless gene targeting approach. The identity of these p53-null cells was confirmed by Southern blot and Western blot analyses. Radiation-induced toxicity and mutagenicity was then compared among p53-null cells, TK6 cells with wild-type p53, and WTK1 cells with a p53 point mutation in codon 237. At the autosomal, heterozygous thymidine kinase locus, p53-null cells had equivalent background mutation frequencies and were approximately equally mutable as TK6, whereas WTK1 was much more sensitive to spontaneously arising and X-ray-induced mutation. Thus, these results indicate that the lack of wild-type p53 did not lead to increased mutagenesis.
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