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Carcinogenesis, Vol 19, 69-72, Copyright © 1998 by Oxford University Press

ARTICLES

A spectrum of mutations induced by crotonaldehyde in shuttle vector plasmids propagated in human cells

M Kawanishi, T Matsuda, G Sasaki, T Yagi, S Matsui and H Takebe
Department of Radiation Genetics, Graduate School of Medicine, Kyoto University, Japan. kawanishi@eq1.eqc.kyoto-u.ac.jp

A spectrum of crotonaldehyde-induced mutations in the supF gene of the shuttle vector plasmid pMY189 replicated in human fibroblast cells was examined. Base sequence analysis of 104 plasmids with mutations in the supF gene revealed that the majority of the mutations were base substitutions (85%) and the rest were frameshifts (15%). A single base substitution was most frequently found (47%), while 25% had multiple base substitutions and interestingly 13% had tandem (adjacent two) base substitutions. Of the base substitution mutations, 50% were G:C-->T:A transversions and 23% were G:C-->A:T transitions. The mutations were not distributed randomly but were located at several hotspots, most of which were G:C base pairs in 5'-AAGG-3' (or 5'-CCTT-3') sequences. Production of propanodeoxyguanosine adducts may be related to such specificity in the mutation spectrum.
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