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Additional recommended knowledge
Hydrogenosomes were discovered in the early 1970s by Lindmark and Müller in the US.
Hydrogenosomes are approximately 1 micrometre in diameter and are so called because they produce molecular hydrogen. Like mitochondria, they are bound by distinct double membranes and have an inner membrane with some cristae-like projections. Hydrogenosomes evolved from mitochondria by the concomitant loss of classical mitochondrial features, most notably its genome. A hydrogenosomal genome could not be detected in Neocallimastix, Trichomonas vaginalis and Trichomonas foetus . However, a hydrogenosomal genome has been detected in the cockroach ciliate Nyctotherus ovalis in 1998 .
The anaerobic ciliated protozoan Nyctotherus ovalis, found in the hindgut of several species of cockroach, has numerous hydrogenosomes that are intimately associated with endosymbiotic methane-producing Archaea, the latter using the hydrogen produced by the hydrogenosomes. The matrix of N. ovalis hydrogenosomes contains ribosome-like particles of the same size as a numerous type of ribosome (70s) of the endosymbiotic methanogenic Archaea. This suggested the presence of an organellar genome which was discovered indeed by Akhmanova and later partly sequenced by Boxma.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hydrogenosome". A list of authors is available in Wikipedia.|