title: 8-hydroxyquinoline inhibition of DNA synthesis and intragenic recombination during yeast meiosis.
abstract: Complete inhibition of sporulation was observed in two strains of Saccharomyces cerevisiae to which 8-hydroxyquinoline was added at a final concentration of 5 microgram/ml during the initial 4 to 6 h of sporulation. The cells were most sensitive to the inhibitor during 4 to 6 interval beginning at approximately 2 h (T2). Its addition during that interval resulted in 70 to 80% lethality in strain 4579 and about 40% in API at T24. When present from T0 onward, 5 microgram/ml of 8-hydroxyquinoline severely inhibited premeiotic DNA replication and reduced the frequency of intragenic recombination at the ade 2  and leu 2 loci by 70 and 100%, respectively, relative to control cultures which did not have the inhibitor present. During the period when the cells were most sensitive, the incorporation of 14C-leucine into protein and 14C-adenine into RNA was not inhibited nor was the polysome content affected. At 150 microgram/ml of inhibitor, incorporation of labeled precursors into RNA and protein were inhibited and the percentage of active ribosomes was reduced by 35% within 45 min, but neither transcription or translation appeared to be completely inhibited at this concentration of the inhibitor.
mesh_terms: D002453:Cell Cycle; D004261:DNA Replication / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D006912:Hydroxyquinolines / Q000494:pharmacology*; D014176:Protein Biosynthesis / Q000187:drug effects; D012313:RNA / Q000096:biosynthesis; D011995:Recombination, Genetic / Q000187:drug effects*; D012441:Saccharomyces cerevisiae / Q000502:physiology; D013172:Spores, Fungal; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D006912:Hydroxyquinolines; D012313:RNA