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Title: Functional categorization of transcriptome in the species Symphysodon aequifasciatus Pellegrin 1904 (Perciformes: Cichlidae) exposed to benzo(a)pyrene and phenanthrene
Authors: Souza Pinto Lemgruber, Renato de
Marshall, Nislanha Ana dos Anjos
Andrea, Ghelfi,
Fagundes, Daniel Barros
Val, Adalberto Luis
Keywords: Benzo(a)pyrene
Dna, Complementary
Amino Acid Sequence
Controlled Study
Dna Binding
Dna Library
Down Regulation
Environmental Exposure
Gene Expression
Gene Function
Gene Identification
Gene Interaction
Gene Ontology
High Throughput Sequencing
Oxidation Reduction Reaction
Rna Extraction
Serial Analysis Of Gene Expression
Symphysodon Aequifasciatus
Fish Proteins
Gene Expression Regulation
Issue Date: 2013
metadata.dc.publisher.journal: PLoS ONE
metadata.dc.relation.ispartof: Volume 8, Número 12
Abstract: This study aims to evaluate the transcriptome alterations, through cDNA libraries, associated with the combined effects of two PAHs, benzo[a]pyrene (0.5 μg/L) and phenanthrene (50 μg/L), present in crude oil, on specimens of Symphysodon aequifasciatus (discus fish) after 48 h of exposure. The cDNA libraries were constructed according to the SOLiD™ SAGE™ protocol for sequencing in the SOLiD v.3 Plus sequencer. The results were analyzed by bioinformatics and differentially expressed genes were categorized using the gene ontology program. The functional categories (terms) found in the gene ontology and the gene network generated using STRING software were used to predict the adverse effects of benzo[a]pyrene and phenanthrene in the liver. In the present study, 27,127 genes (compared to Danio rerio database) were identified. Considering only those genes with a p-value less than or equal to 0.05 and greater than or equal to two-fold change in expression across libraries, we found 804 genes, 438 down-regulated (54%) and 366 up-regulated (46%), in the experimental group compared to the control. Out of this total, 327 genes were successfully categorized, 174 downregulated and 153 up-regulated, using gene ontology. Using String, the gene network was composed by 199 nodes, 124 of them resulting in 274 interactions. The results showed that even an acute exposure of 48 h caused metabolic change in response to environmental contaminants, resulting in changes of cell integrity, in oxidation-reduction processes, in the immune response and disturbances of intracellular signaling of discus fish. Also the gene network has showed no central interplay cluster, exhibiting instead interconnected clusters interactions and connected sub-networks. These findings highlight that even an acute sublethal exposure of PAHs can cause metabolism changes that may affect survival of discus. Our findings using SOLiD coupled with SAGE-method resulted in a powerful and reliable means for gene expression analysis in discus, a non-model Amazonian fish. © 2013 Lemgruber et al.
metadata.dc.identifier.doi: 10.1371/journal.pone.0081083
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