Early origin of canonical introns

Alastair G. B. Simpson (), Erin K. MacQuarrie and Andrew J. Roger
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Alastair G. B. Simpson: Canadian Institute for Advanced Research, Program in Evolutionary Biology, Dalhousie University
Erin K. MacQuarrie: Canadian Institute for Advanced Research, Program in Evolutionary Biology, Dalhousie University
Andrew J. Roger: Canadian Institute for Advanced Research, Program in Evolutionary Biology, Dalhousie University

Nature, 2002, vol. 419, issue 6904, 270-270

Abstract: Abstract Spliceosomal introns, one of the hallmarks of eukaryotic genomes, were thought to have originated late in evolution1,2 and were assumed not to exist in eukaryotes that diverged early — until the discovery of a single intron with an aberrant splice boundary in the primitive 'protozoan' Giardia3. Here we describe introns from a close relative of Giardia, Carpediemonas membranifera, that have boundary sequences of the normal eukaryotic type, indicating that canonical introns are likely to have arisen very early in eukaryotic evolution.

Date: 2002
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DOI: 10.1038/419270a

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