NDLI: Identification and phylogeny of putative PEPC genes in three toxin-producing Karenia (Dinophyta) species

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Identification and phylogeny of putative PEPC genes in three toxin-producing Karenia (Dinophyta) species

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ryan, Darcie E. Campbell, Lisa
Description	Country affiliation: United States Author Affiliation: Ryan DE ( Department of Oceanography, Texas A & M University, College Station, Texas, 77843, USA.); Campbell L ( Department of Oceanography, Texas A & M University, College Station, Texas, 77843, USA.)
Abstract	Dense blooms of toxin-producing Karenia brevis increase local surface ocean pH through $CO_{2}$ uptake. To identify genes that may contribute to bloom-related environmental pH and $pCO_{2}$ changes, transcriptomes with RNA from K. brevis Wilson cultures that had been acclimated to low $CO_{2}$ (250 ppm) or recent $CO_{2}$ (350 ppm) $pCO_{2}$ levels were assembled. Among the annotated transcripts were PEPC, PPDK, and PEPCK enzymes found in the model C4 carbon fixation pathway. Previous studies have demonstrated that the enzymatic activity of PEPC, PPDK, and/or PEPCK in some algae species, including marine diatoms, is influenced by variations in dissolved inorganic carbon. We found significantly similar PEPC, PPDK, and PEPCK enzymes in the transcriptomes of K. brevis and two sister species Karenia papilionacea, and Karenia mikimotoi. One or more isoforms of PEPC were also identified in the transcriptomes of thirty additional photosynthetic phytoplankton species from nine phyla. Phylogenetic trees were constructed with neighbor joining and maximum likelihood techniques to characterize the evolutionary relationship among phytoplankton, terrestrial plant C4, and terrestrial plant C3 PEPC sequences. Based on the nucleotide trees constructed during this study, the Karenia PEPC transcripts were more closely related to the terrestrial C4 genes than the terrestrial C3 genes. Furthermore, PEPC phylogeny among phytoplankton closely resembles phylogenetic trees constructed with ribosomal RNA. This study confirmed that the toxin-producing dinoflagellates K. brevis, K. mikimotoi, and K. papilionacea express putative PEPC, PEPCK, and PPDK transcripts.
File Format	HTM / HTML
ISSN	00223646
Issue Number	4
Journal	Journal of Phycology
Volume Number	52
e-ISSN	15298817
Language	English
Publisher	Wiley
Publisher Date	2016-08-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Botany
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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