Ecotoxicology

, Volume 26, Issue 1, pp 127–140

De novo transcriptome sequencing and analysis of freshwater snail (Radix balthica) to discover genes and pathways affected by exposure to oxazepam

  • Jean-Yves Mazzitelli
  • Elsa Bonnafe
  • Christophe Klopp
  • Frédéric Escudier
  • Florence Geret
Article

Abstract

Pharmaceuticals are increasingly found in aquatic ecosystems due to the non-efficiency of waste water treatment plants. Therefore, aquatic organisms are frequently exposed to a broad diversity of pharmaceuticals. Freshwater snail Radix balthica has been chosen as model to study the effects of oxazepam (psychotropic drug) on developmental stages ranging from trochophore to hatching. In order to provide a global insight of these effects, a transcriptome deep sequencing has been performed on exposed embryos. Eighteen libraries were sequenced, six libraries for three conditions: control, exposed to the lowest oxazepam concentration with a phenotypic effect (delayed hatching) (TA) and exposed to oxazepam concentration found in freshwater (TB). A total of 39,759,772 filtered raw reads were assembled into 56,435 contigs having a mean length of 1579.68 bp and mean depth of 378.96 reads. 44.91% of the contigs have at least one annotation. The differential expression analysis between the control condition and the two exposure conditions revealed 146 contigs differentially expressed of which 144 for TA and two for TB. 34.0% were annotated with biological function. There were four mainly impacted processes: two cellular signalling systems (Notch and JNK) and two biosynthesis pathways (Polyamine and Catecholamine pathways). This work reports a large-scale analysis of differentially transcribed genes of R. balthica exposed to oxazepam during egg development until hatching. In addition, these results enriched the de novo database of potential ecotoxicological models.

Keywords

Ecotoxicology RNA sequencing Pharmaceutical Differential analysis Radix balthica 

Supplementary material

10646_2016_1748_MOESM1_ESM.xlsx (26 kb)
Supplementary Table S1

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Jean-Yves Mazzitelli
    • 1
  • Elsa Bonnafe
    • 1
  • Christophe Klopp
    • 2
  • Frédéric Escudier
    • 2
  • Florence Geret
    • 1
  1. 1.Biochimie et Toxicologie des Substances Bioactives (BTSB), EA7417Université de Toulouse, INU ChampollionAlbiFrance
  2. 2.Unité de Mathématique et Informatique Appliquées de Toulouse, UR0875INRA ToulouseCastanet-TolosanFrance

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