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Tandem‐base mutations occur in mouse liver and adipose tissue preferentially as G:C to T:A transversions and accumulate with age
Author(s) -
Buettner Victoria L.,
Hill Kathleen A.,
Halangoda Asanga,
Sommer Steve S.
Publication year - 1999
Publication title -
environmental and molecular mutagenesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1
H-Index - 87
eISSN - 1098-2280
pISSN - 0893-6692
DOI - 10.1002/(sici)1098-2280(1999)33:4<320::aid-em9>3.0.co;2-s
Subject(s) - mutagen , transversion , adipose tissue , mutant , biology , liver tissue , mutagenesis , carcinogen , genetics , microbiology and biotechnology , mutation , endocrinology , gene
Abstract Tandem‐base mutations (TBM) are associated with ultraviolet light and other mutagens. Herein, we report an age‐ and tissue‐specific difference in the frequency of spontaneous TBM in Big Blue® transgenic mice. A total of 390 mutants from liver and adipose tissue contained 17 and 4 TBM, respectively, while no TBM were detected in 683 mutants from six other tissues. There was a proportional increase in the frequency of TBM in liver with age (29 days postconception to 25 months of age). Nine TBM (43%) were GG to TT transversions that preferentially occurred at specific sites. The remaining 12 mutants contained at least one transversion mutation each. We speculate that the increase of TBM in liver and adipose tissue with age is due to chronic mutagen exposure, perhaps derived from fat in the diet. Environ. Mol. Mutagen. 33:320–324, 1999 © 1999 Wiley‐Liss, Inc.