期刊
NEW PHYTOLOGIST
卷 208, 期 2, 页码 570-583出版社
WILEY
DOI: 10.1111/nph.13467
关键词
cox1 intron; gene conversion; Geraniaceae; homing endonuclease; multiple organellar genes; parasitic plant
资金
- National Science Foundation [IOS-1027259]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1027529] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1125386] Funding Source: National Science Foundation
The exchange of genetic material between cellular organelles through intracellular gene transfer (IGT) or between species by horizontal gene transfer (HGT) has played an important role in plant mitochondrial genome evolution. The mitochondrial genomes of Geraniaceae display a number of unusual phenomena including highly accelerated rates of synonymous substitutions, extensive gene loss and reduction in RNA editing. Mitochondrial DNA sequences assembled for 17 species of Geranium revealed substantial reduction in gene and intron content relative to the ancestor of the Geranium lineage. Comparative analyses of nuclear transcriptome data suggest that a number of these sequences have been functionally relocated to the nucleus via IGT. Evidence for rampant HGT was detected in several Geranium species containing foreign organellar DNA from diverse eudicots, including many transfers from parasitic plants. One lineage has experienced multiple, independent HGT episodes, many of which occurred within the past 5.5 Myr. Both duplicative and recapture HGT were documented in Geranium lineages. The mitochondrial genome of Geranium brycei contains at least four independent HGT tracts that are absent in its nearest relative. Furthermore, G. brycei mitochondria carry two copies of the cox1 gene that differ in intron content, providing insight into contrasting hypotheses on cox1 intron evolution.
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