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Vol. 95, Issue 24, 14244-14249, November 24, 1998
Department of Biology, Indiana University, Bloomington, IN 47405
Communicated by Susan R. Wessler, University of Georgia, Athens,
GA, September 24, 1998 (received for review July 28, 1998)
Group I introns are mobile, self-splicing genetic elements found
principally in organellar genomes and nuclear rRNA genes. The only
group I intron known from mitochondrial genomes of vascular plants is
located in the cox1 gene of Peperomia,
where it is thought to have been recently acquired by lateral transfer
from a fungal donor. Southern-blot surveys of 335 diverse genera of
land plants now show that this intron is in fact widespread among
angiosperm cox1 genes, but with an exceptionally patchy
phylogenetic distribution. Four lines of evidence
Copyright © 1998 by The National Academy of Sciences 0027-8424/98/9514244-6$2.00/0
Evolution
Explosive invasion of plant mitochondria by a group I intron
, and
the intron's highly
disjunct distribution, many incongruencies between intron and
organismal phylogenies, and two sources of evidence from exonic
coconversion tractslead us to conclude that the 48 angiosperm genera
found to contain this cox1 intron acquired it by 32 separate horizontal transfer events. Extrapolating to the over 13,500 genera of angiosperms, we estimate that this intron has invaded
cox1 genes by cross-species horizontal transfer over
1,000 times during angiosperm evolution. This massive wave of lateral
transfers is of entirely recent occurrence, perhaps triggered by some
key shift in the intron's invasiveness within angiosperms.
*
Present address: Institute of Systematic Botany, University of
Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland.
Present address: Department of Chemistry and Biochemistry,
Denison University, Granville, OH 43023.
To whom reprint requests should be addressed. e-mail:
jpalmer{at}bio.indiana.edu.
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