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Updated: Aug 14, 2026
Resurrection of Dormant Daphnia magna: Protocol and Applications
Published on: January 19, 2018
Molecular impact of propiconazole on Daphnia magna using a reproduction-related cDNA array
Anneleen Soetaert1, Lotte N Moens, Karlijn Van der Ven
1Department of Biology, Laboratory for Ecophysiology, Biochemistry and Toxicology, University of Antwerp, Belgium. anneleen.soetaert@ua.ac.be
Abstract:
We have developed a first version cDNA microarray of the cladoceran Daphnia magna. Through Suppression Subtractive Hybridisation PCR (SSH-PCR) 855 life stage-specific cDNAs were collected and used to document the toxicological mode of action of the pesticide propiconazole. DNA sequencing analysis revealed gene fragments related to important functional classes such as embryo development, energy metabolism, molting and cell cycle. Major changes in transcription were observed in organisms exposed for 4 and 8 days to 1 microg/mL. After 4 days a 3-fold down-regulation of the gene encoding the yolk protein, vitellogenin, was observed indicating impaired oocyte maturation. Moreover, genes such as a larval-specific gene and chaperonin were repressed, whereas the heat shock 90 protein and ATP synthase were induced. Organismal effects clearly confirmed the major molecular findings: at the highest concentration (1 microg/mL) adult growth was significantly (p < 0.05) impaired and increased developmental effects in the offspring could be noted. We have demonstrated the potential of microarray analysis in toxicity screening with D. magna. The use of vitellogenin mRNA as a rapid biomarker of reproductive effects in chronic toxicity studies with cladocerans is suggested.
Insights
This study introduces a Daphnia magna microarray to assess pesticide toxicity. Propiconazole exposure impaired vitellogenin gene expression, indicating reproductive effects in this aquatic invertebrate.
Area of Science:
- Environmental toxicology
- Molecular biology
- Aquatic invertebrate research
Background:
- The cladoceran Daphnia magna is a crucial model organism for ecotoxicological studies.
- Understanding molecular mechanisms of pesticide toxicity is vital for environmental risk assessment.
Purpose of the Study:
- To develop a cDNA microarray for Daphnia magna.
- To investigate the toxicological mode of action of the pesticide propiconazole using the developed microarray.
- To identify potential biomarkers for reproductive effects.
Main Methods:
- Development of a first-version cDNA microarray for Daphnia magna.
- Suppression Subtractive Hybridisation PCR (SSH-PCR) to identify 855 life stage-specific cDNAs.
- Exposure of Daphnia magna to propiconazole and subsequent gene expression analysis via microarray.
- Organismal toxicity testing to correlate molecular findings with phenotypic effects.
Main Results:
- The microarray identified gene fragments related to embryo development, energy metabolism, molting, and cell cycle.
- Propiconazole exposure (1 microg/mL) for 4 and 8 days caused significant transcriptional changes.
- Down-regulation of vitellogenin gene expression was observed, suggesting impaired oocyte maturation.
- Repression of larval-specific and chaperonin genes, with induction of heat shock 90 protein and ATP synthase.
- Impaired adult growth and increased developmental effects in offspring were confirmed at the highest concentration.
Conclusions:
- Microarray analysis is a powerful tool for toxicity screening in Daphnia magna.
- Vitellogenin mRNA can serve as a rapid biomarker for reproductive effects in cladocerans.
- Propiconazole exerts toxic effects impacting reproduction and development in Daphnia magna.
