Unknown,Transcriptomics,Genomics,Proteomics

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MRNA-Seq of daphnia magna juveniles exposed to different sub-lethal concentrations of Fipronil in a modified acute immobilisation test below against untreated control groups


ABSTRACT: The aim of this mRNA expression profiling experiment was to screen for ecotoxicogenomic fingerprints in juvenile daphnids (daphnia magna) as aquatic vertebrate non-target model exposed to sub lethal concentrations of Fipronil. Fipronil is a widely used insecticide applied for crop protection against field pests and Ectoparasites. The Insecticide Resistance Action Committee (IRAC) classified Fipronil after its mode of action (MoA) in the target organism as a GABA-gated chloride channel blocker (Group 2). The goal is to identify toxicogenomic profiles with predictive character and identify potential molecular key events (KE) explaining upstream adverse effects. This will provide useful information to refine and improve existing adverse outcome pathways (AOP). Furthermore, integrating the obtained profiles for this and other tested chemicals in a collective database will enable us in the future to derive predictions about the ecotoxicological hazard for chemcials with unknown apical effects, based on similarly altered transcriptomic and proteomic profiles. In a modified version of the acute immobilisation test (OECD 202), 50 juvenile Daphnids were exposed to two sub lethal concentrations of Fipronil for 48 hours under static conditions. Each test comprised of a low exposure (LE), high exposure (HE) and a negative control (NC) group and was performed in triplicates. At 48 hours after introducing the daphnids into the test solutions, RNA and protein was extracted from living daphnids with NucleoSpin RNA/Protein kit (Macherey-Nagel). RNA quality was assessed with a 2100 Bioanalyzer system (Agilent) before messenger RNA was purified (PolyA selection with TruSeq RNA Library Prep Kit v2) and sequenced on an Illumina HiSeq 4000 System (Illumina) in 50 bp single read mode, producing roughly 30 million reads per sample. Adapter sequences were removed with trimmomatic and sequences were aligned to the D. magna reference genome (daphmag2.4) using STAR. Counting of feature mapped reads was performed through featureCounts. Library gene count tables were then merged to a single count matrix as input for count normalization and differential gene expression analysis with DESeq2.

INSTRUMENT(S): Illumina HiSeq 4000

ORGANISM(S): Daphnia magna

SUBMITTER: Julia Pfaff 

PROVIDER: E-MTAB-9829 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Toxicogenomic differentiation of functional responses to fipronil and imidacloprid in Daphnia magna.

Pfaff Julia J   Reinwald Hannes H   Ayobahan Steve U SU   Alvincz Julia J   Göckener Bernd B   Shomroni Orr O   Salinas Gabriela G   Düring Rolf-Alexander RA   Schäfers Christoph C   Eilebrecht Sebastian S  

Aquatic toxicology (Amsterdam, Netherlands) 20210727


Active substances of pesticides, biocides or pharmaceuticals can induce adverse side effects in the aquatic ecosystem, necessitating environmental hazard and risk assessment prior to substance registration. The freshwater crustacean Daphnia magna is a model organism for acute and chronic toxicity assessment representing aquatic invertebrates. However, standardized tests involving daphnia are restricted to the endpoints immobility and reproduction and thus provide only limited insights into the u  ...[more]

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