Diplomonad

Diplomonad
Diplomonads
Giardia lamblia
Scientific classification
Domain: Eukaryota
(unranked): Excavata
Phylum: Metamonada
Order: Diplomonadida

The diplomonads are a group of flagellates, most of which are parasitic. They include most notably Giardia lamblia, which causes giardiasis in humans. They are placed among the metamonads, and appear to be particularly close relatives of the retortamonads.

Most diplomonads are double cells: they have two nuclei, each with four associated flagella, arranged symmetrically about the body's main axis. Like the retortamonads, they lack both mitochondria and a Golgi apparatus. However they are now known to possess mitochondrial relics, called mitosomes. These are not used in ATP synthesis the way mitochondria are, but are involved in the maturation of iron-sulfur proteins.[1]

References

  1. ^ Tovar J, León-Avila G, Sánchez LB et al. (2003). "Mitochondrial remnant organelles of Giardia function in iron-sulphur protein maturation". Nature 426 (6963): 172–6. doi:10.1038/nature01945. PMID 14614504. 

External links

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  • diplomonad — dip·lo·mo·nad (dip″lo moґnad) [diplo + Gr. monas unit, from monos, single] 1. pertaining to or caused by protozoa of the order Diplomonadida. 2. a protozoan of the order Diplomonadida …   Medical dictionary

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  • Excavate — This article is about the protist group. For the process of digging, see Excavation (disambiguation). Excavates Giardia lamblia, a parasitic diplomonad Scientific classification …   Wikipedia

  • Giardia lamblia — Taxobox color = khaki name = Giardia lamblia image width = 200px image caption = Giardia cell, SEM domain = Eukaryota phylum = Metamonada ordo = Diplomonadida familia = Hexamitidae genus = Giardia species = G. lamblia binomial = Giardia lamblia… …   Wikipedia

  • Retortamonad — Taxobox color = khaki name = Retortamonads domain = Eukaryota unranked phylum = Excavata phylum = Metamonada ordo = Retortamonadida subdivision ranks = Genera subdivision = Retortamonas Chilomastix The retortamonads are a small group of… …   Wikipedia

  • Giardia lamblia — or G. intestinalis Single celled protozoan parasite. Pear or beet shaped, the cells have two nuclei and eight flagella and attach with a sucking organ to human intestinal mucous membranes. They cause the disease giardiasis. Generally spread when… …   Universalium

  • Giardia — noun dʒiˈɑɹdiɑ a) Any of a genus of freshwater diplomonad flagellates. b) Specifically the human intestinal parasite Giardia lamblia …   Wiktionary

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