Unikont
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| Unikonts | ||||
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| Scientific classification | ||||
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| Supergroups | ||||
Unikont is a eukaryotic cell with a single flagellum, at least ancestrally. Current research suggests that a unikont was the ancestor of opisthokonts (animals, fungi and related forms) and amoebozoa, and a bikont (a eukaryotic cell with two flagella) was the ancestor of archaeplastida (plants and relatives), excavata, rhizaria, and chromalveolata. The unikonts also have a triple-gene fusion that is lacking in the bikonts, and a single centriole (Cavalier-Smith, 2002, 2006). (Some unikonts have two centrioles but their origins are developmentally different than in the bikonts, indicating convergent evolution (Cavalier-Smith 2006). The three genes that are fused together in the unikonts but not bacteria or bikonts encode enzymes for synthesis of the pyramidine nucleotides: carbamoyl phosphate synthase, dihydroorotase, aspartate carbamoyltransferase (Cavalier-Smith 2006). This must have involved a double fusion, a rare pair of events, further supporting the shared ancestry of Opisthokonta and Amoebozoa.
References
- Cavalier-Smith, Thomas (2002). "The phagotrophic origin of eukaryotes and phylogenetic classification of Protozoa". International Journal of Systematic and Evolutionary Microbiology 52 (2): 297–354. ISSN 1466-5026. Retrieved on 2007-06-08.
- Cavalier-Smith, Thomas (2006). "Protist phylogeny and the high-level classification of Protozoa". European Journal of Protistology 39 (4): 338-348. ISSN 0932-4739.
- Stechmann, Alexandra; Cavalier-Smith, Thomas (2003). "The root of the eukaryote tree pinpointed". Current Biology 13 (17): R665-R666. doi:10.1016/S0960-9822(03)00602-X. ISSN 0960-9822.Template:Taxonomy-stub
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