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. 1990 Oct;10(10):5271–5278. doi: 10.1128/mcb.10.10.5271

A novel pathway for alternative splicing: identification of an RNA intermediate that generates an alternative 5' splice donor site not present in the primary transcript of AMPD1.

I Mineo 1, P R Clarke 1, R L Sabina 1, E W Holmes 1
PMCID: PMC361213  PMID: 2398891

Abstract

AMP deaminase (AMPD) is a central enzyme in eucaryotic energy metabolism, and tissue-specific as well as stage-specific isoforms are found in many vertebrates. This study demonstrates the AMPD1 gene product in rat is alternatively spliced. The second exon, a 12-base miniexon, was found to be excluded or included in a tissue-specific and stage-specific pattern. This example of cassette splicing utilizes a unique pathway through an RNA intermediate that generates an alternative 5' splice donor site at the point where exon 2 is ligated to exon 1. In the analogous intermediate of human AMPD1, the potential 5' splice donor site created at the boundary of exon 1 and exon 2 was a poor substrate for splicing because of differences in exon 2 sequences, and human AMPD1 was not alternatively spliced. These results demonstrate that in some cases alternative splicing may proceed through an RNA intermediate that generates an alternative splice donor site not present in the primary transcript. Discrimination between alternative 5' splice donor sites in the RNA intermediate of AMPD1 is apparently controlled by tissue-specific and stage-specific signals.

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