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Determining Genetic Expression Profiles in C. elegans Using Microarray and Real-time PCR
Published on: July 30, 2011
Expression profiling of five different xenobiotics using a Caenorhabditis elegans whole genome microarray
Kerstin Reichert1, Ralph Menzel
1Institute of Biology, Ecotoxicology and Biochemistry, Free University Berlin, Ehrenbergstrasse 26-28, 14195 Berlin, Germany. kerstinpost@web.de
Chemosphere
|September 20, 2005
Summary
This study used Caenorhabditis elegans gene expression to develop a new ecotoxicological test system. Exposure to five xenobiotics revealed significant changes in gene expression, confirming the test system's potential.
Area of Science:
- Ecotoxicology
- Genomics
- Molecular Biology
Background:
- Caenorhabditis elegans is a widely used model organism in ecotoxicology due to its sensitivity and ease of laboratory handling.
- Genome sequencing of C. elegans enables investigation into the functional relationship between gene expression and phenotypic responses.
- DNA microarray technology offers a powerful method for analyzing gene expression patterns under various experimental conditions.
Purpose of the Study:
- To investigate the effects of five different xenobiotics on the gene expression of Caenorhabditis elegans.
- To assess the applicability of gene expression analysis for developing a novel, genome-based ecotoxicological test system.
- To identify specific gene expression changes induced or suppressed by xenobiotic exposure.
Main Methods:
- Utilized a whole-genome DNA microarray for Caenorhabditis elegans.
- Exposed nematodes to five xenobiotics: beta-naphthoflavone (beta-NF), fluoranthene (Fla), atrazine, clofibrate, and diethylstilbestrol (DES) for 48+/-5 hours.
- Analyzed gene expression data to identify significant changes in gene induction and suppression.
Main Results:
- Exposure to xenobiotics resulted in the induction of 203 genes, including those in families such as cytochromes P450, UDP-glucuronosyltransferases (UGTs), and glutathione S-transferases (GSTs).
- Fluoranthene induced the highest number of genes, while atrazine caused the strongest suppression of gene expression.
- Significant fold-changes in gene expression were observed, ranging from 2.1- to 42.3-fold for upregulated genes and 2.1- to 6.6-fold for downregulated genes.
Conclusions:
- Gene expression analysis in Caenorhabditis elegans is a viable approach for developing a sensitive and substance-class-specific ecotoxicological test system.
- This genome-based approach allows for rapid screening of numerous genes simultaneously and identification of key marker genes.
- The developed test system offers advantages over classical ecotoxicological tests, including increased sensitivity and potential for detailed mechanistic studies.
