Nucleic Acids Research, 1995, Vol. 23, No. 15 2893-2899
© 1995
MOLECULAR BIOLOGY |
8-Hydroxyadenine (7, 8-dihydro-8-Oxoadenine) induces misincorporation in in vitro DNA synthesis and mutations in NIH 3T3 cells
Faculty of Pharmaceutial Sciences, Hokkaido University Kita-, Nishi-6, Kita-Ku, Sapporo 060, Japan 1Cellular Physiology Laboratory, The Institute of Physical and Chemical Research (RIKEN) Wako, Saitama 351-01, Japan 2Banyu Tsukuba Research Institute Okubo-3, Tsukuba 300-33, Japan
*To Whom correspondence should be addressed
Received April 28, 1995. Accepted June 16, 1995.
An oligodeoxyribonucleotide containing 8-hydroxyadenine (OH8Ade) was chemically synthesized and single- and double-stranded c-Ha-ras gene fragments with OH8Ade at the second position of codon 61 were prepared. The single-stranded ras gene fragment was used as a template for in vitro DNA synthesis with the Klenow fragment of Escherichla coli DNA polymerase I, Taq DNA polymerase, rat DNA polymerase ß and mouse DNA polymerase
. The former two enzymes exclusively incorporated dTMP opposite 0H8Ade. The DNA polymerases a and p misinserted dGMP, and dAMP and dGMP, respectively. The c-Ha-ras gene was constructed using the double-stranded ras gene fragment containing OH8Ade and was transfected into NIH 3T3 cells. The gene with OH8Ade induced focus formation, Indicating that OH8Ade elicited point mutations in cells. When c-Ha-ras genes present in transformed cells were analyzed, an A
G transition and an A
C transversion were detected. These results indicate that OH8Ade induced misincorporation in in vitro DNA synthesis and mutations in mammalian cells.
+Present address: Department of Environmental Oncology, Institute of Industiral Ecological, Sciences, University of Occupational and Environmental Health, I- Iseigaoka, Kitakyushu 807, Japan
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