RESUMEN
A peroxiredoxin6 (PRDX6)-like gene segment has been found in up-regulated cDNA libraries of earthworm Eisenia fetida exposed to benzo[a]pyrene(BaP). Analysis with basic local alignment search tool (BLAST) and phylogenetic analysis revealed that the gene segment contains a characteristic motif which was encoded by Cys, illustrating that this gene segment belongs to PRDX. To verify the response of PRDX in E. feitida exposed to poly aromatic hydrocarbons (PAHs), four-week pollution experiments were conducted following the methods recommended by the Organization for Economic Co-operation and Development (OECD). The results showed that the expression of PRDX was up-regulated in earthworm exposed to 1.0 mg x kg(-1) Pyrene and BaP. It was indicated that PRDX in E. fetida was the potential molecular biomarkers of antioxidative stress caused by soil contamination.