Specific transcripts are elevated in Saccharomyces cerevisiae in response to DNA damage
Differential hybridization has been used to identify genes in Saccharomyces cerevisiae displaying increased transcript levels after treatment of cells with UV irradiation or with the mutagen/carcinogen 4-nitroquinoline-1-oxide (NQO). The authors describe the isolation and characterization of four DNA damage responsive genes obtained from screening ca. 9000 yeast genomic clones. Two of these clones, lambda 78A and pBR178C, contain repetitive elements in the yeast genome as shown by Southern hybridization analysis. Although the genomic hybridization pattern is distinct for each of these two clones, both of these sequences hybridize to large polyadenylated transcripts ca. 5 kilobases in length. Two other DNA damage responsive sequences, pBRA2 and pBR3016B, are single-copy genes and hybridize to 0.5- and 3.2-kilobase transcripts, respectively. Kinetic analysis of the 0.5-kilobase transcript homologous to pBRA2 indicates that the level of this RNA increases more than 15-fold within 20 min after exposure to 4-nitroquinoline-1-oxide. Moreover, the level of this transcript is significantly elevated in cells containing the rad52-1 mutation which are deficient in DNA strand break repair and gene conversion. These results provide some of the first evidence that DNA damage stimulates transcription of specific genes in eucaryotic cells.
- Research Organization:
- Univ. of California School of Medicine, Los Angeles
- OSTI ID:
- 5776992
- Journal Information:
- Mol. Cell. Biol.; (United States), Vol. 4:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NITRO COMPOUNDS
GENETIC EFFECTS
SACCHAROMYCES CEREVISIAE
GENETIC RADIATION EFFECTS
TRANSCRIPTION
CLONE CELLS
COMPARATIVE EVALUATIONS
DNA REPAIR
GENES
HYBRIDIZATION
RNA
STRAND BREAKS
ULTRAVIOLET RADIATION
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
CELL CULTURES
ELECTROMAGNETIC RADIATION
FUNGI
MICROORGANISMS
NUCLEIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLANTS
RADIATION EFFECTS
RADIATIONS
RECOVERY
REPAIR
SACCHAROMYCES
YEASTS
560131* - Radiation Effects on Microorganisms- Basic Studies- (-1987)
560302 - Chemicals Metabolism & Toxicology- Microorganisms- (-1987)