Possible Mitochondria-Related Organelles in Poorly-Studied “Amitochondriate” Eukaryotes

Part of the Microbiology Monographs book series (MICROMONO, volume 9)


The diversity of mitochondria-like organelles is not restricted to the best-studied examples presented in the previous chapters. The recognised diversity of anaerobic and microaerophilic organisms is broader and they are distributed all across the eukaryotic tree. Many of them – pelobionts, most or all metamonads, anaerobic heteroloboseans, Postgaardi, Andalucia incarcerata and Breviata – harbour double membrane-bounded organelles that do not resemble classical mitochondria, in the sense that they do not have cristae, but are probably homologous to them. For various reasons, these organelles, and the organisms in which they are found, have been studied very little. For example, most of these taxa are not significant from a medical or economic perspective, some were recognised only recently and many are difficult to handle in the laboratory. Therefore, the relationship of these organelles to mitochondria and their functional properties are deduced, so far, only from indirect evidence including the presence of a double-membrane envelope, their association with hydrogen consuming methanogens and the discovery of mitochondrion- or hydrogenosome-specific genes in the organism's genome. Although studies on the metabolic properties of these organelles will struggle with technical obstacles, they promise interesting insights into the versatility of mitochondrial structure and function, and the evolution of anaerobic/microaerophilic life histories.


Ferredoxin Oxidoreductase Methanobacterium Formicicum Mitochondrial Target Peptide Epibiotic Bacterium Pyridine Nucleotide Transhydrogenase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  1. 1.Department of BiologyDalhousie UniversityHalifaxCanada

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