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Molecular Biology and Evolution 17:751-756 (2000)
© 2000 Society for Molecular Biology and Evolution

Original Articles

Terminal-Sequence Conservation Identifies Spliceosomal Introns in Ascomycete 18S RNA Genes

Oscar F. Cubero1,*, Paul D. Bridge{ddagger} and Ana Crespo*

*Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid, Spain; and
{dagger}School of Biological and Chemical Sciences, Birkbeck, University of London, London, England, and Mycology Section, Royal Botanic Garden, Kew, Richmond, England

Abstract

Twenty-four new insertions were obtained from seven different locations in the nuclear 18S rDNA for seven species of the lichen-forming fungal genus Physconia. They were analyzed allowing for terminal sequence conservation by adopting a flexible approach to exact insertion site position, and they were compared with 12 previously reported small insertion sequences from the 18S ribosomal RNA gene. Such insertions have previously been proposed to be degenerate self-splicing group I introns; however, the methodology used here identified consensus terminal sequences characteristic of spliceosomal introns. This finding is the first suggestion that multiple spliceosomal introns occur in ribosomal genes.


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