DNA polymerase I is required for premeiotic DNA replication and sporulation but not for X-ray repair in Saccharomyces cerevisiae
We have used a set of seven temperature-sensitive mutants in the DNA polymerase I gene of Saccharomyces cerevisiae to investigate the role of DNA polymerase I in various aspects of DNA synthesis in vivo. Previously, we showed that DNA polymerase I is required for mitotic DNA replication. Here we extend our studies to several stages of meiosis and repair of X-ray-induced damage. We find that sporulation is blocked in all of the DNA polymerase temperature-sensitive mutants and that premeiotic DNA replication does not occur. Commitment to meiotic recombination is only 2% of wild-type levels. Thus, DNA polymerase I is essential for these steps. However, repair of X-ray-induced single-strand breaks is not defective in the DNA polymerase temperature-sensitive mutants, and DNA polymerase I is therefore not essential for repair of such lesions. These results suggest that DNA polymerase II or III or both, the two other nuclear yeast DNA polymerases for which roles have not yet been established, carry out repair in the absence of DNA polymerase I, but that DNA polymerase II and III cannot compensate for loss of DNA polymerase I in meiotic replication and recombination. These results do not, however, rule out essential roles for DNA polymerase II or III or both in addition to that for DNA polymerase I.
- Research Organization:
- California Institute of Technology, Pasadena (USA)
- OSTI ID:
- 6068640
- Journal Information:
- Mol. Cell. Biol.; (United States), Vol. 9:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DNA POLYMERASES
BIOLOGICAL FUNCTIONS
GENES
SACCHAROMYCES CEREVISIAE
DNA REPLICATION
DNA
DNA REPAIR
GENE RECOMBINATION
MEIOSIS
MUTATIONS
SPORES
STRAND BREAKS
X RADIATION
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
CELL DIVISION
ELECTROMAGNETIC RADIATION
ENZYMES
EUMYCOTA
FUNCTIONS
FUNGI
IONIZING RADIATIONS
MICROORGANISMS
NUCLEIC ACID REPLICATION
NUCLEIC ACIDS
NUCLEOTIDYLTRANSFERASES
ORGANIC COMPOUNDS
PHOSPHORUS-GROUP TRANSFERASES
PLANTS
POLYMERASES
RADIATIONS
RECOVERY
REPAIR
SACCHAROMYCES
TRANSFERASES
YEASTS
560130* - Radiation Effects on Microorganisms