title: Induction of mutation of a synthetic c-Ha-ras gene containing hypoxanthine.
abstract: The second base of codon 61 of a synthetic c-Ha-ras gene was replaced with a hypoxanthine residue in a site-specific manner. Transfection of this gene into NIH3T3 cells by the calcium phosphate procedure resulted in increased focus formation. Total DNA was extracted from transformed cells, and the sequences of the inserted c-Ha-ras DNA were analyzed by the polymerase chain reaction-single-strand conformation polymorphism method. Mutations with A (or hypoxanthine) to G transition were detected exclusively. These results suggest that the synthetic c-Ha-ras gene can be used for investigations of mutagenesis caused by DNA lesions.
authors.affiliation: Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kamiya
authors.forename: H
authors.initials: H
authors.lastname: Miura
authors.forename: H
authors.initials: H
authors.lastname: Kato
authors.forename: S
authors.initials: S
authors.lastname: Nishimura
authors.forename: E
authors.initials: E
authors.lastname: Ohtsuka
mesh_terms: D016475:3T3 Cells; D000595:Amino Acid Sequence; D000818:Animals; D001482:Base Composition; D001483:Base Sequence; D002471:Cell Transformation, Neoplastic; D003062:Codon; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D005813:Genes, Synthetic; D011905:Genes, ras; D006860:Hydrogen Bonding; D019271:Hypoxanthine; D007042:Hypoxanthines; D051379:Mice; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides; D010957:Plasmids; D016133:Polymerase Chain Reaction / Q000379:methods; D015183:Restriction Mapping; D014162:Transfection
chemical_list: D003062:Codon; D007042:Hypoxanthines; D009838:Oligodeoxyribonucleotides; D019271:Hypoxanthine; D004247:DNA