title: Transfer of the E. coli O6-methylguanine methyltransferase gene into repair-deficient human cells and restoration of cellular resistance to N-methyl-N'-nitro-N-nitrosoguanidine.
abstract: We have constructed a plasmid on which the E. coli O6-methylguanine-DNA methyltransferase (MT) gene (ada gene) was linked with an SV40 promoter sequence and a poly(A) site. After transferring this plasmid into Mer- HeLa MR cells by DNA transfection, effective expression of E. coli MT was observed. Isolated stable transformant clones showed higher resistance to N-methyl-N'-nitro-N-nitrosoguanidine in colony formation and sister-chromatid exchange induction than HeLa MR cells.
mesh_terms: D002470:Cell Survival / Q000187:drug effects; D003001:Cloning, Molecular; D004260:DNA Repair; D005786:Gene Expression Regulation; D006147:Guanine / Q000031:analogs & derivatives* / Q000378:metabolism; D006801:Humans; D008769:Methylnitronitrosoguanidine / Q000494:pharmacology*; D008780:Methyltransferases / Q000378:metabolism*; D019853:O(6)-Methylguanine-DNA Methyltransferase; D010957:Plasmids; D012854:Sister Chromatid Exchange / Q000187:drug effects; D014162:Transfection
chemical_list: D008769:Methylnitronitrosoguanidine; D006147:Guanine; C008449:O-(6)-methylguanine; D008780:Methyltransferases; D019853:O(6)-Methylguanine-DNA Methyltransferase