A photosynthetic alveolate closely related to apicomplexan parasites

Moore, Robert B., Oborník, Miroslav, Janouškovec, Jan, Chrudimský, Tomáš, Vancová, Marie, Green, David H., Wright, Simon W., Davies, Noel W., Bolch, Christopher J.S., Heimann, Kirsten, Šlapeta, Jan, Hoegh-Guldberg, Ove, Logsdon, John M., and Carter, Dee A. (2008) A photosynthetic alveolate closely related to apicomplexan parasites. Nature, 451 (7181). pp. 959-963.

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Many parasitic Apicomplexa, such as Plasmodium falciparum, contain an unpigmented chloroplast remnant termed the apicoplast, which is a target for malaria treatment. However, no close relative of apicomplexans with a functional photosynthetic plastid has yet been described. Here we describe a newly cultured organism that has ultrastructural features typical for alveolates, is phylogenetically related to apicomplexans, and contains a photosynthetic plastid. The plastid is surrounded by four membranes, is pigmented by chlorophyll a, and uses the codon UGA to encode tryptophan in the psbA gene. This genetic feature has been found only in coccidian apicoplasts and various mitochondria. The UGA-Trp codon and phylogenies of plastid and nuclear ribosomal RNA genes indicate that the organism is the closest known photosynthetic relative to apicomplexan parasites and that its plastid shares an origin with the apicoplasts. The discovery of this organism provides a powerful model with which to study the evolution of parasitism in Apicomplexa.

Item ID: 1923
Item Type: Article (Research - C1)
ISSN: 0028-0836
Keywords: Chromera, new phylum, apicomplexa, malaria, parasites, dinoflagellate
Date Deposited: 29 Jul 2008
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060399 Evolutionary Biology not elsewhere classified @ 100%
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