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- W2065516029 abstract "Abstract Pfiesteria piscicida is a harmful bloom-forming alga that has received a great deal of attention due to its potential association with large fish kills and neurological problems in humans. Since the discovery of Pfiesteria , several other Pfiesteria -like dinoflagellates (PLDs) have also been identified. Genetic identification and phylogenetic relationships among the PLDs commonly utilize sequence data from the genes and spacers of the ribosomal DNA (rDNA) operon. Of these, the internal transcribed spacers (ITSs) have been previously shown to fold into secondary structures that are critical for proper ribosomal processing. In this study, we modeled the secondary structure of the second internal transcribed spacer (ITS2) from 16 PLDs (as well as an outgroup taxon) using phylogenetic comparative methods and minimum free energy. The secondary structural models predicted for these dinoflagellates consisted of four paired helices separated by five unpaired regions, consistent with those reported from many eukaryotes. All of the structures were highly stable (Δ G = −66.1 to −122.3 kcal·mol at 37 °C) and several structural characters were found to be conserved either across the PLDs or were specific to monophyletic subgroups, strengthening previously inferred phylogenetic relationships among taxa. Additionally, an 18 bp motif was identified in the PLDs whose position corresponds to a ribosomal processing site described from other eukaryotes. Potential applications of these ITS2 secondary structures include utility in strain and species identification, phylogenetic inference and serving as a tool for identifying and excluding rDNA pseudogenes when assessing biodiversity within the PLDs." @default.
- W2065516029 created "2016-06-24" @default.
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- W2065516029 date "2009-02-01" @default.
- W2065516029 modified "2023-09-24" @default.
- W2065516029 title "Secondary structural modeling of the second internal transcribed spacer (ITS2) from Pfiesteria-like dinoflagellates (Dinophyceae)" @default.
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- W2065516029 doi "https://doi.org/10.1016/j.hal.2008.09.004" @default.
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