ISSN:
1617-4623
Keywords:
Key words Gene transfer
;
NADH: ubiquinone oxidoreductase
;
Liverwort
;
Signal peptide
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The nad7 gene, encoding subunit 7 of NADH dehydrogenase, is mitochondrially encoded in seed plants. In the liverwort, Marchantia polymorpha, only a pseudogene is located in the mitochondrial genome. We have now identified the functional nad7 gene copy in the nuclear genome of Marchantia, coding for a polypeptide of 468 amino acids. The nuclear-encoded nad7 has lost the two group II introns present in the mitochondrial pseudogene copy. Instead, a typical nuclear intron is found to split an exon encoding the presumptive mitochondrial targeting signal peptide and the mature subunit 7 of NADH dehydrogenase. These results suggest that RNA-mediated gene transfer from the mitochondrial into the nuclear genome occurs not only in seed plants but also in bryophytes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00008616
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