The protozoan parasite Entamoeba histolytica is responsible for invasive intestinal Entamoeba histolytica’s origin of virulence is coincidental. Entamoeba histolytica is an anaerobic parasitic amoebozoan, part of the genus Entamoeba. Predominantly infecting humans and other primates causing. Entamoeba Polecki is an intestinal protozoan which is best known for its infection and never identified or were misdiagnosed as E. histolytica.
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Entamoeba is a genus of Amoebozoa found as internal parasites or commensals of animals.
Taxonomy of Entamoeba histolytica
He referred to the amoeba he observed microscopically as Amoeba coli ; however, it is not clear whether he was using this as a descriptive term or intended it as a formal taxonomic name.
For a time during the first half of the 20th century the entire genus Entamoeba was transferred to Endamoebaa genus of amoebas infecting invertebrates about which little is known. This move was reversed by the International Commission on Zoological Nomenclature in the late s, and Entamoeba has stayed ‘stable’ ever since.
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 netamoeba Entamoeba coli not to be confused with Escherichia coli and Entamoeba dispar  are harmless. With the exception of Entamoeba gingivaliswhich lives in the mouth, and E.
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Entamoeba invadens is a species that can cause a disease similar to E. In contrast to other species, E. Many other species of Entamoeba have been described, and it is entamoebq that many others remain to be found.
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. It divides by simple binary fission to form two smaller daughter cells.
Almost all species form cysts, the stage involved in transmission the exception is Entamoeba gingivalis. Depending on the species, these can have one, four or eight nuclei and are variable in size; these characteristics help in species identification.
Entamoeba belongs to the Archamoebaewhich like many other anaerobic eukaryotes lack mitochondria. This group also includes Endolimax and Iodamoebawhich also live in animal intestines and are similar in appearance to Klaifikasialthough this may partly be due to convergence. Also in this group are the free-living amoebo-flagellates of the genus Mastigamoeba and related genera.
Studying Entamoeba invadensDavid Biron of the Weizmann Institute of Science and coworkers found that about one third of the cells are unable to histolttica unaided and recruit a neighboring amoeba dubbed the “midwife” to complete the fission. They also reported a similar behavior in Dictyostelium.
After inducing encystation in E. On completion of encystation, predominantly tetra-nucleate cysts are formed along with some uni- bi- and tri-nucleate cysts. 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. Instead the differentiation process is studied using E. Until recently there was no genetic transfection vector available for this organism and detailed study at etamoeba cellular level was not possible.
However, recently a transfection vector was developed and the transfection conditions for E. In sexually reproducing etnamoebahomologous recombination HR ordinarily occurs during meiosis. The meiosis-specific recombinaseDmc1is required for efficient meiotic HR, and Dmc1 is expressed in E. From Wikipedia, the free encyclopedia. Entamoeba Entamoeba histolytica trophozoite Scientific classification Domain: This article needs additional citations for verification.
Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Hjstolytica Learn how and when to remove this template message. Journal of Eukaryotic Microbiology. Molecular Biology and Evolution. Dynamics of DNA synthesis during differentiation from trophozoite to histooytica. Molecular and Biochemical Parasitology. Flabellina Flabellulidae Leptomyxina Gephyramoebidae Leptomyxidae. Phryganellina Eulobosina Centropyxidae Difflugidae.
Pelomyxina Pelomyxidae Mastigamoebina Mastigamoebidae. Holomastigida Phalansteriida Artodiscida Varipodida. Retrieved from ” https: Amoebozoa genera Parasitic amoebozoa Conosa. Articles with ‘species’ microformats Articles needing additional references from December All articles needing additional references Commons category link from Wikidata. Views Read Edit View history.
Wikispecies has information related to Entamoeba. Wikimedia Commons has media related to Entamoeba. Cutosea Squamocutida Squamamoebidae Sapocribridae. Euamoebida Nolandellidae Amoebidae Hartmannellidae.
Archamoebae incertae sedis Tricholimacidae Endamoebidae. Variosea paraphyletic Holomastigida Phalansteriida Artodiscida Varipodida.