Molecular identification and expression study of differentially regulated genes in the Pacific oyster Crassostrea gigas in response to pesticide exposure.
The effects of pesticide contamination on the metabolism of marine molluscs are poorly documented. We investigated the response of a marine bivalve, the Pacific oyster, Crassostrea gigas, using a suppression subtractive hybridization method to identify up- and down-regulated genes after a 30-day exposure period to herbicides (a cocktail of atrazine, diuron and isoproturon, and to the single herbicide glyphosate). A total of 137 unique differentially expressed gene sequences was identified, as well as their associated physiological process. The expression of 18 of these genes was analyzed by RT-PCR under laboratory experimental conditions. The metabolic functions they are associated with include xenobiotic detoxification, energy production, immune system response and transcription. This study provides a preliminary basis for studying the response of marine bivalves to long-term herbicide exposure in terms of regulated gene expression and characterizes new potential genetic markers of herbicide contamination.
Tanguy
Arnaud
A
Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR-CNRS 6539, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, Place Nicolas Copernic, F-29280 Plouzané, France.
Boutet
Isabelle
I
Laroche
Jean
J
Moraga
Dario
D
D000110:Acetylcholinesterase / Q000378:metabolism; D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D005786:Gene Expression Regulation / Q000187:drug effects*; D006540:Herbicides / Q000633:toxicity*; D007928:Lethal Dose 50; D010125:Ostreidae / Q000187:drug effects* / Q000378:metabolism; D020365:RNA Helicases / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
D006540:Herbicides; D000110:Acetylcholinesterase; D000251:Adenosine Triphosphatases; D020365:RNA Helicases