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The best evidence for the single origin of mitochondria comes from a conserved set of clearly homologous and commonly inherited genes preserved in the mitochondrial DNA across all...
Mitochondria have their own circular DNA chromosome that is stabilized by attachments to the inner membrane and carries genes similar to genes expressed by alpha-proteobacteria. Mitochondria also have special ribosomes and transfer RNAs that resemble these components in prokaryotes.
What Is the Origin of Mitochondria? Mitochondria are thought to have originated from an ancient symbiosis that resulted when a nucleated cell engulfed an aerobic prokaryote.
Despite this diversity, all mitochondria derive from a common ancestral organelle that originated from the integration of an endosymbiotic alphaproteobacterium into a host cell related to Asgard Archaea.
The evolutionary explosion powered by mitochondria is evident by the fact they are found in every complex multicellular organism that has ever existed, from giraffes to palm trees, mushrooms and...
To trace back mitochondria’s origin, the scientists did experiments with Jakobida, the earliest known, tiny free-living organisms that retain a bacteria-like mitochondrial genome.
Three aspects of eukaryote origins have been the subject of extensive debate: the timing of mitochondrial acquisition, nature of the host, and mechanism of acquisition. Although it is difficult to pin down the timing of mitochondrial acquisition, the field has made progress.
These data confirm that the mitochondrial genome originated from a eubacterial (specifically α-proteobacterial) ancestor but raise questions about the evolutionary antecedents of the mitochondrial proteome.
The serial endosymbiosis theory is a favored model for explaining the origin of mitochondria, a defining event in the evolution of eukaryotic cells.
Most of the proteins and other molecules that make up mitochondria originate in the cell nucleus. However, 37 genes are contained in the human mitochondrial genome, 13 of which produce various components of the electron transport chain (ETC).