A Reduced Transcriptome Approach to Assess Environmental Toxicants Using Zebrafish Embryo Test

Area of Science:

• Environmental Toxicology
• Genomics
• Molecular Biology

Background:

• Omics approaches monitor biological responses to environmental toxicants but are limited by high costs and lack of standardized toxicogenomic methods.
• Transcriptomics offers genome-scale insights but requires efficient, cost-effective tools for broad chemical assessment.

Purpose of the Study:

• To develop and validate a reduced zebrafish transcriptome (RZT) approach for cost-effective toxicogenomic profiling.
• To assess the bioactivity of chemicals and environmental mixtures using zebrafish embryos.
• To establish a sensitive method for prioritizing toxicants based on pathway responsiveness.

Main Methods:

• Developed a reduced zebrafish transcriptome (RZT) gene set (1637 Entrez genes) to represent whole transcriptome changes.
• Utilized RNA-ampliseq technology for quantitative gene expression analysis in zebrafish embryos.
• Applied concentration-response modeling to determine effect concentrations (ECs) of differentially expressed genes (DEGs) and pathways.

Main Results:

• The RZT-ampliseq-embryo approach demonstrated sensitivity in identifying a wide spectrum of biological activities from BPA exposure and water samples.
• Water quality was benchmarked using a sensitivity distribution curve of biological pathways.
• Identified key pathways linked to reproductive outcomes, genotoxicity, and developmental effects.

Conclusions:

• The RZT-ampliseq-embryo approach provides an efficient and cost-effective tool for toxicogenomic assessment.
• This method enables accurate profiling of chemical bioactivity and prioritization of toxicants based on sensitive biological pathway responses.
• The approach is valuable for monitoring environmental toxicants and assessing potential adverse effects.