title: Bacterial endosymbionts of Pyrodinium bahamense var. compressum.
abstract: The study presents evidence in support of the bacterial theory associated with the toxicity of Pyrodinium bahamense var. compressum. Bacterial endosymbionts from Philippine P. bahamense var. compressum strain Pbc MZRVA 042595 were isolated and identified via 16S rDNA sequence analysis. Taxonomic diversity of the identified culturable intracellular microbiota associated with Philippine P. bahamense var. compressum was established to be limited to the Phyla Proteobacteria, Actinobacteria, and Firmicutes. Major endosymbionts identified included Moraxella spp., Erythrobacter spp., and Bacillus spp., whereas Pseudomonas putida, Micrococcus spp., and Dietzia maris were identified as minor isolates. All identified strains except D. maris, P. putida, and Micrococcus spp. were shown to contain either saxitoxin or neo saxitoxin or both at levels < or =73 ng/10(7) bacterial cells based on high-performance liquid chromatography analysis. Paralytic shellfish poisoning-like physiologic reactions in test animals used in the mouse assay were recorded for the endosymbionts except for P. putida. The study is the first to elucidate the possible contribution of bacterial endosymbionts in the toxicity of P. bahamense var. compressum isolated in the Philippines.
authors.affiliation: Department of Food Science and Nutrition, College of Home Economics, University of the Philippines, Diliman, Quezon City 1101, Philippines. mvazanza@up.edu.ph
authors.forename: Ma Patricia V
authors.initials: MP
authors.lastname: Azanza
authors.forename: Rhodora V
authors.initials: RV
authors.lastname: Azanza
authors.forename: Vanessa Mercee D
authors.initials: VM
authors.lastname: Vargas
authors.forename: Cynthia T
authors.initials: CT
authors.lastname: Hedreyda
mesh_terms: D000818:Animals; D001419:Bacteria / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D004141:Dinoflagellida / Q000382:microbiology*; D008387:Marine Toxins / Q000032:analysis / Q000633:toxicity; D051379:Mice; D010679:Philippines; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012530:Saxitoxin / Q000032:analysis / Q000633:toxicity; D013559:Symbiosis
chemical_list: D008387:Marine Toxins; D012336:RNA, Ribosomal, 16S; D012530:Saxitoxin