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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Multiple trans-splicing events are required to produce a mature nad1 transcript in a plant mitochondrion.

The mitochondrial gene encoding NADH dehydrogenase subunit 1 (nad1) in Petunia hybrida is split into five exons, a, b, c, d, and e. With the use of a complete restriction map of the 443-kb Petunia mitochondrial genome, we have cloned these exons and mapped their location. Exon a is located 130 kb away from and in the opposite orientation from exons b and c. Exon d maps 95 kb away and in the opposite orientation from exons b and c. Exons d and e are separated by 190 kb. By performing the polymerase chain reaction on Petunia cDNAs, we have shown that transcripts from these five exons are joined via a series of cis- and trans-splicing events to create a mature nad1 transcript. In addition, we have found 23 C----U RNA edit sites in Petunia nad1. RNA editing changes 19 of the amino acids predicted by the genomic sequence.[1]


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