Journal Article

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

Oscar F. Cubero, Paul D. Bridge and Ana Crespo

in Molecular Biology and Evolution

Published on behalf of Society for Molecular Biology and Evolution

Volume 17, issue 5, pages 751-756
Published in print May 2000 | ISSN: 0737-4038
Published online May 2000 | e-ISSN: 1537-1719 | DOI: http://dx.doi.org/10.1093/oxfordjournals.molbev.a026353
Terminal-Sequence Conservation Identifies Spliceosomal Introns in Ascomycete 18S RNA Genes

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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.

Journal Article.  4110 words.  Illustrated.

Subjects: Evolutionary Biology ; Molecular and Cell Biology

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