NDLI: Evolution of trans-splicing plant mitochondrial introns in pre-Permian times

Content Provider	PubMed Central
Author	Malek, Olaf Axel, Brennicke Knoop, Volker
Copyright Year	1997
Abstract	Trans-splicing in angiosperm plant mitochondria connects exons from independent RNA molecules by means of group II intron fragments. Homologues of trans-splicing introns in the angiosperm mitochondrial nad2 and nad5 genes are now identified as uninterrupted group II introns in the ferns Asplenium nidus and Marsilea drummondii. These fern introns are correctly spliced from the pre-mRNA at the sites predicted from their well-conserved secondary structures. The flanking exon sequences of the nad2 and nad5 genes in the ferns require RNA editing, including the removal of in-frame stop codons by U-to-C changes for correct expression of the genetic information. We conclude that cis-splicing introns like the ones now identified in ferns are the ancestors of trans-splicing introns in angiosperm mitochondria. Intron disruption is apparently due to a size increase of the structurally variable group II intron domain IV followed by DNA recombination in the plant mitochondrial genome.
Starting Page	553
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	2
Volume Number	94
Language	English
Publisher	The National Academy of Sciences of the USA
Publisher Date	1997-01-21
Access Restriction	Open
Rights Holder	The National Academy of Sciences of the USA
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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Evolution of trans-splicing plant mitochondrial introns in pre-Permian times.

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