Akira Sono

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A meiotic DNA polymerase that is present at a high level of activity in meiotic cells of a basidiomycete, Coprinus cinereus, was purified to near homogeneity using synthetic RNA homopolymer [poly(C)] cellulose column chromatography. This report presents the first extensive purification and characterization of any eukaryotic DNA polymerase having a role in(More)
A meiotic DNA polymerase [DNA nucleotidyltransferase (DNA-directed), EC], which likely has a role in meiotic DNA repair, was isolated from a mushroom, Agaricus bisporus. The purified fraction displays three bands in SDS/PAGE, at molecular masses of 72 kDa, 65 kDa and 36 kDa. Optimal activity is at pH 7.0-8.0 in the presence of 5 mM Mg2+ and 50 mM(More)
Cycloheximide (CH) and puromycin (PM)strongly antagonize induction of sister-chromatid exchanges (SCEs) by exogenous agents regardless of the mechanism for initiating damage. 5-Bromodeoxyuridine (BUdR) substitution was used to monitor SCEs, but the background level of BUdR-induced SCEs was unaffected by the presence of protein inhibitors. Antagonism(More)
Mutation frequency tests for isepamicin (HAPA-B), a new aminoglycoside antibiotic, were carried out using Salmonella typhimurium strains TA98, TA100, TA1535 and Escherichia coli WP2uvrA. After a 30-minute exposure of bacterial cells at 37 degrees C to HAPA-B in a buffer solution, the cells were washed twice with a buffer solution to minimize the(More)
Although phosphatidylinositol (PI) is an important component in all plants and animals, there is no toxicity report when purified PI is orally administrated to animals. As a safety evaluation of PI, acute, subchronic and genotoxicity studies were conducted with purified PI from soy lecithin (Asahi Kasei PI). Up to 2,000 mg/kg of Asahi Kasei PI was(More)
Cycloheximide strongly antagonizes the induction of sister-chromatid exchange by mitomycin C in Vicia faba root tips. This behavior is analogous to that previously observed in mammalian cells (Sono and Sakaguchi, 1981) and suggests that newly synthesized protein is also required for recombination between sister DNA molecules in plants. Conversely(More)
To better understand the molecular events involved in the formation of SCEs and mutations, 3 clonal sublines were established from a Chinese hamster cell line, Don D-6, on the basis of hyposensitivity to killing by ethyl methanesulfonate. These sublines, referred to as T80-4, T80-6 and T80-7, exhibited greatly altered karyotypes and altered frequencies of(More)
A clonal derivative of a Chinese hamster Don D-6 cell line resistant to methyl methane sulfonate (MMS) has been isolated following mutagenesis by ethyl methane sulfonate (EMS). The clone, designated as MMSr-1, exhibited high resistance to killing by the monofunctional alkylating agents MMS and EMS. This characteristic had not been acquired by a transient(More)
The effect of colchicine, Colcemid and vincristine on ethyl methanesulfonate-induced sister chromatid exchanges and chromosomal aberrations was studied in Chinese hamster cells. The number of ethyl methanesulfonate-induced sister chromatid exchanges was markedly decreased with increasing doses of colchicine and vincristine. In the presence of colchicine,(More)