Proteomic analysis of the soil filamentous fungus Aspergillus nidulans exposed to a Roundup formulation at a dose causing no macroscopic effect: a functional study

  • Florence Poirier
  • Céline Boursier
  • Robin Mesnage
  • Nathalie Oestreicher
  • Valérie Nicolas
  • Christian Vélot
Research Article

Abstract

Roundup® is a glyphosate-based herbicide (GBH) used worldwide both in agriculture and private gardens. Thus, it constitutes a substantial source of environmental contaminations, especially for water and soil, and may impact a number of non-target organisms essential for ecosystem balance. The soil filamentous fungus Aspergillus nidulans has been shown to be highly affected by a commercial formulation of Roundup® (R450), containing 450 g/L of glyphosate (GLY), at doses far below recommended agricultural application rate. In the present study, we used two-dimensional gel electrophoresis combined to mass spectrometry to analyze proteomic pattern changes in A. nidulans exposed to R450 at a dose corresponding to the no-observed-adverse-effect level (NOAEL) for macroscopic parameters (31.5 mg/L GLY among adjuvants). Comparative analysis revealed a total of 82 differentially expressed proteins between control and R450-treated samples, and 85% of them (70) were unambiguously identified. Their molecular functions were mainly assigned to cell detoxification and stress response (16%), protein synthesis (14%), amino acid metabolism (13%), glycolysis/gluconeogenesis/glycerol metabolism/pentose phosphate pathway (13%) and Krebs TCA cycle/acetyl-CoA synthesis/ATP metabolism (10%). These results bring new insights into the understanding of the toxicity induced by higher doses of this herbicide in the soil model organism A. nidulans. To our knowledge, this study represents the first evidence of protein expression modulation and, thus, possible metabolic disturbance, in response to an herbicide treatment at a dose that does not cause any visible effect. These data are likely to challenge the concept of “substantial equivalence” when applied to herbicide-tolerant plants.

Keywords

Roundup® NOAEL Aspergillus nidulans Proteomics Metabolism Herbicide tolerance Substantial equivalence 

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Université Paris 13, UFR SMBH, Plateforme PPUP13Bobigny cedexFrance
  2. 2.UMS-IPSIT, US31 Inserm-UMS3679 CNRS, Plateformes Trans-Prot et d’Imagerie Cellulaire, Université Paris-Sud, Faculté de Pharmacie, Tour E1Châtenay-MalabryFrance
  3. 3.Gene Expression and Therapy Group, King’s College London, Faculty of Life Sciences & Medicine, Department of Medical and Molecular GeneticsLondonUK
  4. 4.CRIIGENParisFrance
  5. 5.Laboratoire VEAC, Université Paris-Sud, Faculté des SciencesOrsayFrance
  6. 6.Pôle Risques MRSH-CNRS, Université de Caen, Esplanade de la PaixCaenFrance

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