PMID: 6159982Oct 1, 1980Paper

Correlation between splicing sites within an intron and their sequence complementarity with U1 RNA

Cell
V E AvvedimentoB de Crombrugghe

Abstract

We have determined the nucleotide sequence of two short introns (respectively 215 and 90 nucleotides) in the chick alpha 2-collagen (type I) gene as well as parts of the adjacent exons. For one of these introns we find that the 5' end of U1 RNA is complementary not only to the two ends of the intron but also to one end of the intron and sequences inside this intron. These complementarities predict three potential internal splicing sites. By S1 mapping experiments we find three discrete RNA precursors in which different portions of this intron have been deleted. The sizes of the deleted segments are in good agreement with the location of the predicted splicing points inside the intron. The DNA sequence indicates that removal of one portion of the intron should still allow the subsequent elimination of the rest of the intron and the correct splicing of the coding segments located at each end of the intron. The new introns created by the first splicing events contain sequences at each end which are also complementary to U1 RNA. Our data indicate that in the intron which we have examined the sequences at the 3' end of the intron are removed before those at the 5' end.

Citations

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