期刊
MUTATION RESEARCH-FUNDAMENTAL AND MOLECULAR MECHANISMS OF MUTAGENESIS
卷 452, 期 2, 页码 219-229出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0027-5107(00)00090-7
关键词
lacI transgene; spontaneous mutations; tumorigenesis; mutator phenotype
资金
- NINDS NIH HHS [NS33354] Funding Source: Medline
To characterize the nature of multiple mutations in the tissues of an intact animal, the Big Blue(R) transgenic mouse mutation detection system was used to examine 1459 mutants from eight normal tissues and 507 mutants from 11 tumors. Multiple mutations occurred and predominantly doublet mutants were identified (i.e. two mutations within one mutant lacI gene), but multiplets of up to five mutations were observed. The frequency of doublets in normal tissues and spontaneous tumors from p53-deficient mice was enhanced to the same degree (660 and 667 fold, respectively) over that expected for two independent mutational events. Doublets, multiplets and singlets have similar patterns of mutation. The distance between mutations in doublets fits an exponential distribution, not that expected for randomly spaced events, suggesting that many doublets occur in rapid succession within the same cell cycle. (C) 2000 Elsevier Science B.V. All rights reserved.
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