Modulation in the mRNA expression of ecdysone receptor gene in aquatic midge, Chironomus riparius upon exposure to nonylphenol and silver nanoparticles

Prakash M.Gopalakrishnan Nair, Jinhee Choi

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Chironomus riparius, a non-biting midge (Chironomidae, Diptera), is extensively used as a model organism in aquatic ecotoxicological studies, although little is known about its genome sequences. Ecdysteroids are steroid hormones that play an important role in development, growth, moulting of larva, and reproduction in Chironomus spp. The effect of ecdysteroids is mediated by their binding to the ecdysteroid receptor (EcR). To study the effect of environmental stressors, nonylphenol and silver nanoparticles (AgNPs), on the modulation of EcR mRNA, in this study, full length cDNA of C. riparius ecdysone receptor (CrEcR) was identified from the Expressed Sequence Tags (ESTs) database and expression of the corresponding mRNA was analyzed following exposure to nonylphenol and AgNPs. The CrEcR cDNA was 2548 base pairs (bp) in length, with a 5' untranslated region (UTR) of 242. bp and a 3' UTR of 684. bp. The open reading frame contains 1617 nucleotides, encoding 539 amino acids with a predicted molecular weight of 61. kDa and p. I of 5.89, and revealed the presence of several domains associated with DNA binding, dimerization, ligand binding and transcriptional activation characteristic of steroid receptor family members. It was found that the expression level of CrEcR was significantly up-regulated on exposure to nonylphenol and significant up or down regulation was observed on exposure to AgNPs. These finding shows that nonylphenol as well as AgNPs could modulate the ecdysone nuclear receptor and may have significant implications in different developmental stages in C. riparius.

Original languageEnglish
Pages (from-to)98-106
Number of pages9
JournalEnvironmental Toxicology and Pharmacology
Volume33
Issue number1
DOIs
StatePublished - Jan 2012

Keywords

  • C. riparius, 454 Pyrosequencing
  • Ecdysone receptor
  • Gene expression
  • Nonylphenol
  • Silver nanoparticles

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