Abstract
A new method for mapping RNA initiation, termination, and splice sites was developed. The method involves: 1) hybridization of RNA to end-labeled single-stranded DNA; 2) mild digestion of the hybrid with a single strand specific nuclease; 3) high resolution gel electrophoresis and autoradiography. The regions of the labeled probe which are resistant to nuclease digestion are mapped by measuring the distance from the labeled end. The sequence can be determined by running the end-labeled probe sequenced according to the protocol of Maxam and Gilbert (Maxam, A.M., and Gilbert, W. (1980) Methods Enzymol. 65, 499-560) at the same time. The feasibility of this method was tested with adult chicken beta-globin mRNA, and we found that the transcription initiation, termination, and RNA splice sites can be determined to within a few bases of the known sites. Using this method we also found that ribosomes bind to beta-globin mRNA from 22 bases upstream from the translation start codon (AUG) to 15 bases past the stop codon (UAA).
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