title: Kinds of mutations induced by 3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone (MX) in the hprt gene of Chinese hamster ovary cells.
abstract: The kinds of mutations induced by 3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone (MX) in the protein coding region of the hprt gene of Chinese hamster ovary (CHO) cells were determined by direct sequencing of polymerase chain reaction (PCR)-amplified cDNA. Primary mutations were found in 15 of 19 of the mutants: 11 were G:C-->T:A transversions, two were A:T-->T:A transversions and two were deletions of single G:C base pairs (-1 frameshifts). The remaining four mutants had large alterations in the cDNA that were explained by mRNA splicing errors. A group of control mutants had more diverse hprt cDNA alterations than MX-induced mutants. Transversions yielding an A:T base pair were the predominant type of MX-induced mutations, in agreement with previous findings in bacteria. This specificity may be explained by the 'A rule', that DNA polymerases preferentially insert adenine nucleotides opposite non-instructional lesions.
authors.affiliation: Division of Environmental Health, National Public Health Institute, Kuopio, Finland.
authors.forename: J M
authors.initials: JM
authors.lastname: Hyttinen
authors.forename: S
authors.initials: S
authors.lastname: Myöhänen
authors.forename: K
authors.initials: K
authors.lastname: Jansson
mesh_terms: D000818:Animals; D001483:Base Sequence; D016466:CHO Cells; D006224:Cricetinae; D005663:Furans / Q000633:toxicity*; D007041:Hypoxanthine Phosphoribosyltransferase / Q000235:genetics*; D008969:Molecular Sequence Data; D009153:Mutagens / Q000633:toxicity*; D009154:Mutation
chemical_list: D005663:Furans; D009153:Mutagens; C054121:3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone; D007041:Hypoxanthine Phosphoribosyltransferase