Words similar to amitochondriate
Example sentences for: amitochondriate
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However, because Giardia arose at an early time (Table 1) and branches near the base of the eukaryote phylogeny, the simplest explanation is that it never possessed mitochondria and is a primary (not secondary) amitochondriate.
Although the position of Giardia in some protein phylogenies [ 30 ] has been proposed as evidence that it is a secondary amitochondriate, others have urged caution until additional, more conclusive, data become available [ 6 ] .
Until about five years ago, it was generally accepted that there was a prior period (before mitochondria) in the history of eukaryotes [ 2 26 ] . The basal position of eukaryotes lacking mitochondria (amitochondriate) in phylogenetic trees [ 27 ] was consistent with this supposition as was evidence from sequence signatures [ 6 ] . However, molecular phylogenetic studies of several proteins in recent years have suggested that some or all amitochondriate eukaryotes once possessed mitochondria in the past [ 9 ] . Based on this new evidence, most current models for the origin of eukaryotes assume only a single symbiotic or fusion event between an archaebacterium and an α-proteobacterium [ 8 28 29 ] .
If two or more symbiotic events were involved, this does not necessarily confirm that any of the living lineages of amitochondriate eukaryotes arose prior to the second (mitochondrial) event.
Our time estimate for the divergence of an early-branching eukaryote ( Giardia ) that lacks mitochondria, 2.2 Ga, suggests that it is a primary and not secondary amitochondriate organism.
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