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Classification NCBI Classification NCBI Domaine Eukaryota Clade Unikonta Embranchement Amoebozoa Sous-embr. Conosa Infra-embr. Archamoebae Classe Archamoeba Ordre Pelobiontida Famille Entamoebidae Entamoeba est un genre d' amibes . Espèces [modifier | modifier le code] Entamoeba barreti – Entamoeba bovis – Entamoeba coli – Entamoeba gingivalis – Entamoeba hartmanni – Entamoeba ...
Entamoeba coli est une espèce d'amibe non pathogène, commensale fréquente du tube digestif de l'homme. En parasitologie, Entamoeba coli (à ne pas confondre avec la bactérie Escherichia coli) présente l'intérêt de faire un diagnostic d'espèce car elle est semblable, en microscopie optique, au parasite Entamoeba histolytica responsable de l'amibiase.
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Several species are found in humans and animals. Entamoeba histolytica is the pathogen responsible for invasive 'amoebiasis' (which includes amoebic dysentery and amoebic liver abscesses). Others such as Entamoeba coli (not to be confused with Escherichia coli) and Entamoeba dispar are harmless. With the exception of Entamoeba gingivalis, which liv...
Entamoeba cells are small, with a single nucleus and typically a single lobose pseudopod taking the form of a clear anterior bulge. They have a simple life cycle. The trophozoite (feeding-dividing form) is approximately 10-20 μm in diameter and feeds primarily on bacteria. It divides by simple binary fission to form two smaller daughter cells. Almo...
Entamoeba belongs to the Archamoebae, which like many other anaerobic eukaryotes have reduced mitochondria. This group also includes Endolimax and Iodamoeba, which also live in animal intestines and are similar in appearance to Entamoeba, although this may partly be due to convergence. Also in this group are the free-living amoebo-flagellates of th...
Fission
Studying Entamoeba invadens, David Biron of the Weizmann Institute of Science and coworkers found that about one third of the cells are unable to separate unaided and recruit a neighboring amoeba (dubbed the "midwife") to complete the fission.He writes: 1. When an amoeba divides, the two daughter cells stay attached by a tubular tether which remains intact unless mechanically severed. If called upon, the neighbouring amoeba midwife travels up to 200 μm towards the dividing amoeba, usually adv...
Uninucleated trophozoites convert into cysts in a process called encystation. The number of nuclei in the cyst varies from 1 to 8 among species and is one of the characteristics used to tell species apart. Of the species already mentioned, Entamoeba coli forms cysts with 8 nuclei while the others form tetra-nucleated cysts. Since E. histolytica doe...
In sexually reproducing eukaryotes, homologous recombination (HR) ordinarily occurs during meiosis. The meiosis-specific recombinase, Dmc1, is required for efficient meiotic HR, and Dmc1 is expressed in E. histolytica. The purified Dmc1 from E. histolytica forms presynaptic filaments and catalyzes ATP-dependent homologous DNA pairing and DNA strand...
EntamoebaHomepagePathema-EntamoebaResourceEntamoeba Genome Database at AmoebaDBEntamoeba gingivalis is an opportunistic Amoebozoa [citation needed] (reported by some as an effect of disease; not a cause [hence status as a commensal]) [2] [3] [4] and is the first amoeba in humans to be described. It is found in the mouth [5] inside the gingival pocket biofilm near the base of the teeth, and in periodontal pockets. [1]
Creatures » Cellular Organisms » Eukaryotes » Amoeboid Protists » Evosea » Archamoebae » Mastigamoebida » Entamoebidae » Entamoeba « Entamoeba histolytica collect
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Étymologie : grec ἔντερον énteron intérieur, d’où intestin (surtout pluriel, ἔντερα éntera intestins) et ἀμοιϐή amoibể don en retour, récompense. Nom scientifique d'un genre de Protozoaires important, les Amibes, de la famille des Entamoebidae groupant les genres Entamœba, Endolimax et Iodamœba. Entamœba ...
