PUBLICATION

Differential gene expression as a toxicant-sensitive endpoint in zebrafish embryos and larvae

Authors
Voelker, D., Vess, C., Tillmann, M., Nagel, R., Otto, G.W., Geisler, R., Schirmer, K., and Scholz, S.
ID
ZDB-PUB-070303-3
Date
2007
Source
Aquatic toxicology (Amsterdam, Netherlands)   81(4): 355-364 (Journal)
Registered Authors
Geisler, Robert, Nagel, Roland, Otto, Georg
Keywords
Zebrafish, Embryo test, Early life stage test, Chronic toxicity, Microarray
Datasets
GEO:GSE6228
MeSH Terms
  • Aniline Compounds/toxicity
  • Animals
  • DNA Primers
  • Embryo, Nonmammalian/drug effects
  • Embryo, Nonmammalian/metabolism
  • Endpoint Determination/methods*
  • Gene Expression Profiling/methods*
  • Gene Expression Regulation/drug effects*
  • Larva/drug effects
  • Larva/metabolism
  • Oligonucleotide Array Sequence Analysis
  • Reverse Transcriptase Polymerase Chain Reaction
  • Toxicity Tests/methods*
  • Zebrafish/metabolism*
PubMed
17292976 Full text @ Aquat. Toxicol.
Abstract
The zebrafish (Danio rerio) embryo toxicity test (DarT) is under consideration as an alternative to the acute fish toxicity test. Microscopically visible developmental disorders or death are the endpoints used to report on toxicity in DarT. These endpoints are easily observed. They, however, rarely reveal mechanisms leading to a toxic effect and are relatively insensitive compared to chronic toxic effects. We hypothesized that, by using gene expression profiles as an additional endpoint, it may be possible to increase the sensitivity and predictive value of DarT. Therefore, as a proof of principle, we exposed zebrafish embryos to the reference compound 3,4-dichloroaniline (3,4-DCA) and analyzed gene expression patterns with a 14k oligonucleotide array. Important stress response genes not included in the microarray were additionally quantified by reverse transcriptase polymerase chain reaction. Six genes involved in biotransformation (cyp1a, ahr2), stress response (nfe212, maft, hmox1) and cell cycle control (fzr1) were significantly regulated. With the exception of fzr1, these genes proved to be differentially expressed in post hatch life stages as well. The identified genes point toward an aryl hydrocarbon receptor-mediated response. Differential gene expression in embryos exposed for 48h was observed at 3,4-DCA concentrations as low as 0.78muM, which is more than 10-fold below the concentrations that elicited visible toxic effects. Upon exposure for 5 days, differential expression was detected at concentrations as low as 0.22muM of 3,4-DCA, which was close to the lowest observed effect concentration (0.11muM) in the 30-day early life stage test. This study therefore indicates that gene expression analysis in DarT is able to reveal mechanistic information and may also be exploited for the development of replacement methods for chronic fish tests.
Genes / Markers
Figures
Expression
Phenotype
Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
Errata and Notes