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The 5′- and 3′-UTR regions in pre-mRNAs play a variety of roles in controlling eukaryotic gene expression, including translational modulation. Here we report the results of a systematic study of alternative splicing in rnp-4f, which encodes a Drosophila spliceosomal assembly factor. We show that most of the nine introns are constitutively spliced, but several patterns of alternative splicing are observed...
Drosophila RNP-4F is a highly conserved protein from yeast to human and functions as a spliceosome assembly factor during pre-mRNA splicing. Two major developmentally regulated rnp-4f mRNA isoforms have been described during fly development, designated “long” and “short,” differing by a 177-nt tract in the 5′-UTR. This region potentially folds into a single long stable stem–loop by pairing of intron...
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