Sterols of the syndinian dinoflagellate Amoebophrya sp., a parasite of the dinoflagellate Alexandrium tamarense (Dinophyceae)
Table 1: Cell counts (cells/ml) during the infection of the dinoflagellate Alexandrium tamarense by the dinoflagellate Amoebophrya sp. (26.5Kb)
Table 2: Sterols found during the infection of the dinoflagellate Alexandrium tamarense by the dinoflagellate Amoebophrya sp. (39Kb)
Table 3: Interfraction distribution of sterols during the infection of the dinoflagellate Alexandrium tamarense by the dinoflagellate Amoebophrya sp. (29.5Kb)
Table 4: Relative percentages of sterols found as free sterols during the infection of the dinoflagellate Alexandrium tamarense by the dinoflagellate Amoebophrya sp. (48Kb)
Table 5: Relative percentages of sterols found as sterol esters during the infection of the dinoflagellate Alexandrium tamarense by the dinoflagellate Amoebophrya sp. (48Kb)
Leblond, Jeffrey D.
Sengco, Mario R.
Sickman, James O.
Dahmen, Jeremy L.
Anderson, Donald M.
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Several harmful photosynthetic dinoflagellates have been examined over past decades for unique chemical biomarker sterols. Little emphasis has been placed on important heterotrophic genera, such as Amoebophrya, an obligate, intracellular parasite of other, often harmful, dinoflagellates with the ability to control host populations naturally. Therefore, the sterol composition of Amoebophrya was examined throughout the course of an infective cycle within its host dinoflagellate, Alexandrium tamarense, with the primary intent of identifying potential sterol biomarkers. Amoebophrya possessed two primary C27 sterols, cholesterol and cholesta-5,22Z-dien-3-ol (cis-22-dehydrocholesterol), which are not unique to this genus, but were found in high relative percentages that are uncommon to other genera of dinoflagellates. Because the host also possesses cholesterol as one of its major sterols, carbon stable isotope ratio characterization of cholesterol was performed in order to determine whether it was produced by Amoebophrya or derived intact from the host. Results indicated that cholesterol was not derived intact from the host. A comparison of the sterol profile of Amoebophrya to published sterol profiles of phylogenetic relatives revealed that its sterol profile most closely resembles that of the (proto)dinoflagellate Oxyrrhis marina rather than other extant genera.
Author Posting. © Author Posting. © International Society of Protistologists, 2006. This is the author's version of the work. It is posted here by permission of International Society of Protistologists for personal use, not for redistribution. The definitive version was published in Journal of Eukaryotic Microbiology 53 (2006): 211-216, doi:10.1111/j.1550-7408.2006.00097.x.
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