Fishing for contaminants: identification of three mechanism specific transcriptome signatures using Danio rerio embryos
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In ecotoxicology, transcriptomics is an effective way to detect gene expression changes in response to environmental pollutants. Such changes can be used to identify contaminants or contaminant classes and can be applied as early warning signals for pollution. To do so, it is important to distinguish contaminant-specific transcriptomic changes from genetic alterations due to general stress. Here we present a first step in the identification of contaminant class-specific transcriptome signatures. Embryos of zebrafish (Danio rerio) were exposed to three substances (methylmercury, chlorpyrifos and Aroclor 1254, each from 24 to 48 hpf exposed) representing sediment typical contaminant classes. We analyzed the altered transcriptome to detect discriminative genes significantly regulated in reaction to the three applied contaminants. By comparison of the results of the three contaminants, we identified transcriptome signatures and biologically important pathways (using Cytoscape/ClueGO software) that react significantly to the contaminant classes. This approach increases the chance of finding genes that play an important role in contaminant class-specific pathways rather than more general processes.
KeywordsTranscriptomics Methylmercury Aroclor 1254 Chlorpyrifos Ecotoxicogenomics Pathway network analysis
The present study was part of the research funding project DanTox (DanTox—a novel joint research project using zebrafish (Danio rerio) to identify specific toxicity and molecular modes of action of sediment-bound pollutants). The authors acknowledge financial support by the German Federal Ministry of Education and Research (BMBF grant 02WU1053) and data provision from the GENDarT2 project (BMBF grant AZ:0315190 B). The authors thank Thomas-Benjamin Seiler for improving the language. The authors thank Leonie Nüßer and Daniel Koske for their help with the interpretation of the microarrays.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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