著者
Chikashi Shimoda Akiko Itadani Akio Sugino Mitsuru Furusawa
出版者
The Genetics Society of Japan
雑誌
Genes & Genetic Systems (ISSN:13417568)
巻号頁・発行日
vol.81, no.6, pp.391-397, 2006 (Released:2007-02-03)
参考文献数
16
被引用文献数
24 32

Eukaryotic DNA polymerases δ and ε, both of which are required for chromosomal DNA replication, contain proofreading 3’→5’exonuclease activity. DNA polymerases lacking proofreading activity act as strong mutators. Here we report isolation of thermotolerant mutants by using a proofreading-deficient DNA polymerase δ variant encoded by pol3-01 in the yeast Saccharomyces cerevisiae. The parental pol3-01 strain grew only poorly at temperatures higher than 38°C. By stepwise elevation of the incubation temperature, thermotolerant mutants that could proliferate at 40°C were successfully obtained; however, no such mutants were isolated with the isogenic POL3 strain. The recessive hot1-1 mutation was defined by genetic analysis of a weak thermotolerant mutant. Strong thermotolerance to 40°C was attained by multiple mutations, at least one of which was recessive. These results indicate that a proofreading-deficient DNA δ polymerase variant is an effective mutator for obtaining yeast mutants that have gained useful characteristics, such as the ability to proliferate in harsh environments.