Oct 17, 2008

Mitochondrial DNA of Vitis vinifera and the issue of rampant horizontal gene transfer

Molecular Biology and Evolution
Vadim V GoremykinRoberto Viola

Abstract

The mitochondrial genome of grape (Vitis vinifera), the largest organelle genome sequenced so far, is presented. The genome is 773,279 nt long and has the highest coding capacity among known angiosperm mitochondrial DNAs (mtDNAs). The proportion of promiscuous DNA of plastid origin in the genome is also the largest ever reported for an angiosperm mtDNA, both in absolute and relative terms. In all, 42.4% of chloroplast genome of Vitis has been incorporated into its mitochondrial genome. In order to test if horizontal gene transfer (HGT) has also contributed to the gene content of the grape mtDNA, we built phylogenetic trees with the coding sequences of mitochondrial genes of grape and their homologs from plant mitochondrial genomes. Many incongruent gene tree topologies were obtained. However, the extent of incongruence between these gene trees is not significantly greater than that observed among optimal trees for chloroplast genes, the common ancestry of which has never been in doubt. In both cases, we attribute this incongruence to artifacts of tree reconstruction, insufficient numbers of characters, and gene paralogy. This finding leads us to question the recent phylogenetic interpretation of Bergthorsson et al. (2003, 2004)...Continue Reading

  • References55
  • Citations78

References

  • References55
  • Citations78

Citations

Mentioned in this Paper

Plastids
Grape extract
DNA, Mitochondrial
Vitis
Chloroplasts
Protein Biosynthesis
Vitis vinifera
Gene Transfer, Horizontal
Raisins
Mitochondria

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