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Molecular Biology and Evolution, Vol 10, 1317-1326, Copyright © 1993 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Evidence for independent acquisition of group I introns in green algae

MJ Van Oppen, JL Olsen and WT Stam
Department of Marine Biology, University of Groningen, Haren, The Netherlands.

We report the occurrence of a group I intron, 452 nucleotides in length, in the nuclear small-subunit ribosomal gene of the benthic seaweed Urospora penicilliformis, a member of the green algal class Ulvophyceae. Group I introns have been reported in fungi, myxomycetes, the ciliate genus Tetrahymena, and recently in five unicellular chlorophycean algae. The sequence of the conserved core of the U. penicilliformis group I intron was aligned with that of 15 other introns of this type, and the evolutionary relationships among these introns were examined. Comparison of the "intron" tree with phylogenetic hypotheses of the intron-harboring organisms shows that nuclear group I introns in green algae have arisen several times and are not lineage specific.
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 Mol Biol EvolHome page
K. M. Muller, J. J. Cannone, R. R. Gutell, and R. G. Sheath
A Structural and Phylogenetic Analysis of the Group IC1 Introns in the Order Bangiales (Rhodophyta)
Mol. Biol. Evol., September 1, 2001; 18(9): 1654 - 1667.
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