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Mol Cell Biol. 1993 June; 13(6): 3456-3463

Rapid changes in Drosophila transcription after an instantaneous heat shock.

Section of Genetics and Development, Cornell University, Ithaca, New York 14853.

ABSTRACT

Heat shock rapidly activates expression of some genes and represses others. The kinetics of changes in RNA polymerase distribution on heat shock-modulated genes provides a framework for evaluating the mechanisms of activation and repression of transcription. Here, using two methods, we examined the changes in RNA polymerase II association on a set of Drosophila genes at 30-s intervals following an instantaneous heat shock. In the first method, Drosophila Schneider line 2 cells were quickly frozen to halt transcription, and polymerase distribution was analyzed by a nuclear run-on assay. RNA polymerase transcription at the 5' end of the hsp70 gene could be detected within 30 to 60 s of induction, and by 120 s the first wave of polymerase could already be detected near the 3' end of the gene. A similar rapid induction was found for the small heat shock genes (hsp22, hsp23, hsp26, and hsp27). In contrast to this rapid activation, transcription of the histone H1 gene was found to be rapidly repressed, with transcription reduced by approximately 90% within 300 s of heat shock. Similar results were obtained by an in vivo UV cross-linking assay. In this second method, cell samples removed at 30-s intervals were irradiated with 40-microseconds bursts of UV light from a Xenon flash lamp, and the distribution of polymerase was examined by precipitating UV cross-linked protein-DNA complexes with an antibody to RNA polymerase II. Both approaches also showed the in vivo rate of movement of the first wave of RNA polymerase through the hsp70 gene to be approximately 1.2 kb/min.

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