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The incorporation of radioactivity into DNA and RNA in continuous labeling experiments, pulse-labeling of total RNA, electrophoresis and fluorographic detection of rRNA, and Northern blot analyses to examine the transcription of constitutive and inducible mRNAs and tRNAs were done as described in (12), except that total cellular RNA was isolated with the hot phenol method as described in Current Protocols in Molecular Biology, Wiley, New York, 1993), vol. 2, unit 13.12.
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The amounts of TRP3, RAD23, and CDC9 mRNAs also showed no decline in the srs2Δ sgs1-ts strain at 39°C.
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1 under the microscope, α factor was washed away and the cells were resuspended in fresh YPD medium. The cultures were then split (time O). Half of the culture was incubated at 25°C and the other half at 39°C. DNA content was determined as described [R. Nash, G. Tokiwa, S. Anand, K. Erickson, A. B. Futcher, EMBO J. 7, 4335 (1988)]. Samples were taken at the indicated time points and fixed overnight at 4°C in 1 ml of 70% ethanol. The fixed cells were washed twice, resuspended in 1 ml of 50 mM sodium citrate (pH 7.0), and then treated with ribonuclease A (0.25 mg/ml) for 3 hours at 50°C. Cells were then washed and resuspended in 1 ml of 50 mM sodium citrate (pH 7.0), propidium iodide (16 μg/ml) was added and cells were incubated overnight at 4°C. The DNA content of cells was analyzed by a Becton-Dickinson FACS-can flow cytometer.
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3H]uracil. The cultures were then split and placed at 25° or at 39°C, and DNA synthesis was measured by the incorporation of radioactivity into DNA. Upon transfer to 39°C, DNA synthesis ceased rapidly in the srs2Δ sgs1-ts strain but was not affected in the srs2Δ SGS1 strain.
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Supported by NIH grants GM19261 and CA80882. We thank S. J. Brill for the SGS1 gene.
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