Repeated, recent and diverse transfers of a mitochondrial gene to the nucleus in flowering plants

Keith L. Adams, Daniel O. Daley, Yin-Long Qiu, James Whelan and Jeffrey D. Palmer ()
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Keith L. Adams: Indiana University
Daniel O. Daley: University of Western Australia
Yin-Long Qiu: Indiana University
James Whelan: University of Western Australia
Jeffrey D. Palmer: Indiana University

Nature, 2000, vol. 408, issue 6810, 354-357

Abstract: Abstract A central component of the endosymbiotic theory for the bacterial origin of the mitochondrion is that many of its genes were transferred to the nucleus. Most of this transfer occurred early in mitochondrial evolution1; functional transfer of mitochondrial genes has ceased in animals2. Although mitochondrial gene transfer continues to occur in plants3, no comprehensive study of the frequency and timing of transfers during plant evolution has been conducted. Here we report frequent loss (26 times) and transfer to the nucleus of the mitochondrial gene rps10 among 277 diverse angiosperms. Characterization of nuclear rps10 genes from 16 out of 26 loss lineages implies that many independent, RNA-mediated rps10 transfers occurred during recent angiosperm evolution; each of the genes may represent a separate functional gene transfer. Thus, rps10 has been transferred to the nucleus at a surprisingly high rate during angiosperm evolution. The structures of several nuclear rps10 genes reveal diverse mechanisms by which transferred genes become activated, including parasitism of pre-existing nuclear genes for mitochondrial or cytoplasmic proteins, and activation without gain of a mitochondrial targeting sequence.

Date: 2000
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DOI: 10.1038/35042567

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