title: Mutation spectrum in Salmonella induced by environmental tobacco smoke.
abstract: Environmental tobacco smoke (ETS) is a major source of indoor air pollution. Extractable-respirable particulate (ERP) from the ETS-contaminated indoor air (ERP-ETS) was collected from six passenger train cars and one control room. The mutagenicity of ERP-ETS was tested in the Ames/Salmonella test in the presence of male rat liver microsomal fraction S9. The mutation spectrum of ERP-ETS was determined by colony probe hybridization and polymerase chain reaction/DNA sequence analysis in approximately 2,370 His+ revertants. The results indicate that the majority of ERP-ETS-induced mutations were a two-base deletion of GC or CG within the hotspot sequence of CGCGCGCG at the frameshift hisD3052 allele in strain TA98. The ERP-ETS from the control room induced approximately 94.3% such deletions, while the ERP-ETS collected from the passenger cars induced approximately 89.6% such deletions. The ERP-ETS either from the control room or from the passenger cars induced approximately 74% C/G --> A/T transversions, and approximately 23% C/G --> T/A transitions within the primary target CCC at the hisG46 allele in strain TA100.
authors.affiliation: Department of Biology, Liaoning University, Shenyang, The People's Republic of China.
authors.forename: R
authors.initials: R
authors.lastname: Zhou
authors.forename: G
authors.initials: G
authors.lastname: Yu
authors.forename: Y
authors.initials: Y
authors.lastname: Zhou
authors.forename: X
authors.initials: X
authors.lastname: Zeng
mesh_terms: D016902:Air Pollution, Indoor; D000483:Alleles; D001483:Base Sequence; D004252:DNA Mutational Analysis; D004305:Dose-Response Relationship, Drug; D016368:Frameshift Mutation; D005819:Genetic Markers / Q000235:genetics; D016296:Mutagenesis; D009152:Mutagenicity Tests; D012475:Salmonella / Q000235:genetics; D017384:Sequence Deletion; D014028:Tobacco Smoke Pollution
chemical_list: D005819:Genetic Markers; D014028:Tobacco Smoke Pollution