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J. Biol. Chem., Vol. 261, Issue 27, 12462-12471, 09, 1986
VS Goldmacher, RA Cuzick Jr and WG Thilly
Isogenic variants resistant to alkylating agents have been isolated from
the human lymphoblast cell line TK6. The cell lines may be divided into
four classes on the basis of resistance to N-methyl-N'-nitro-N-
nitrosoguanidine (MNNG). The sensitive TK6 parental line shows a 37%
survival after 45-min exposure to 0.04 microM MNNG; the three classes of
more resistant mutants show 37% survival after 45-min exposure to 2 microM
(MF lines), 6 microM (MT lines), and greater than or equal to 10 microM (MX
line) MNNG. A representative MF line, MF1, is resistant to both killing and
mutation by MNNG or N-methyl-N-nitrosourea. An MT clone, MT1, is highly
resistant to killing but hypermutable by MNNG. The MT1 line, like the
parental TK6, does not remove O6-methylguanine adducts from the DNA. Our
data are consistent with the hypothesis that the MT1 line possesses a
nonexcision pathway of defense against killing by alkylating agents. Rather
than preventing alkylation of DNA or removing alkylated adducts, the MT1
cells appear to be tolerant of the adducts that are not removed from the
DNA.
Isolation and partial characterization of human cell mutants differing in sensitivity to killing and mutation by methylnitrosourea and N- methyl-N'-nitro-N-nitrosoguanidine
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