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. 1985 Jul 11;13(13):4971–4981. doi: 10.1093/nar/13.13.4971

Intron splicing: a conserved internal signal in introns of Drosophila pre-mRNAs.

E B Keller, W A Noon
PMCID: PMC321838  PMID: 2410858

Abstract

The introns of Drosophila pre-mRNAs have been analysed for conserved internal sequence elements near the 3' intron boundary similar to the T-A-C-T-A-A-C in yeast introns and the C/T-T-A/G-A-C/T in introns of other organisms. Such conserved internal elements are the 3' splice signals recognized in intron splicing. In the lariat splicing mechanism, the G at the 5' end of an intron joins covalently to the last A of a 3' splice signal to form a branch point in a splicing intermediate. Analysis of 39 published sequences of Drosophila introns reveals that potential 3' splice signals with the consensus C/T-T-A/G-A-C/T are present in 18 cases. In 17 of the remaining cases signals are present which vary from this consensus just in the middle or last position. In Drosophila introns the 3' splice signal is usually located in a discrete region between 18 and 35 nucleotides upstream from the 3' splice point. We note that the Drosophila small nuclear U2-RNA has sequences complementary to C-T-G-A-T, one variant of the signal, and to C-A-G, one variant of the 3' terminus of an intron. We also note that the absence of any A-G between -3 and -19 from the 3' splice point may be an essential feature of a strong 3' boundary.

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Selected References

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