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Mol Cell Biol. 1990 November; 10(11): 6059-6063

Splicing precedes polyadenylation during Drosophila E74A transcription.

M F LeMaire and C S Thummel

Department of Human Genetics, Howard Hughes Medical Institute, University of Utah Medical Center, Salt Lake City 84132.

ABSTRACT

The E74 gene is one of a small set of early genes induced by the steroid hormone ecdysone at the onset of metamorphosis in the fruit fly, Drosophila melanogaster. This complex gene directs the synthesis of a 60-kilobase (kb) primary transcript that is spliced to form the 6-kb E74A mRNA. In a previous study, we found that ecdysone directly activates the E74A promoter and determined that RNA polymerase II transcribes this gene at a rate of approximately 1.1 kb/min. This elongation rate accounts for most of the 1-hour delay seen between the addition of ecdysone and the appearance of cytoplasmic E74A mRNA (C. S. Thummel, K. C. Burtis, and D. S. Hogness, Cell 61:101-111, 1990). We show here that nascent E74A transcripts are spliced, and we propose a model for the order of that splicing. This study provides, for the first time, direct biochemical evidence for splicing of a low-abundance cellular RNA before transcription termination and polyadenylation.

Mol Cell Biol. 1990 November; 10(11): 6059-6063




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