Overview
The zebrafish test leverages Danio rerio, a tropical freshwater fish, as a model organism for scientific research. Its advantages include a fully sequenced genome, 70% genetic homology with humans, and external fertilization, enabling real-time observation of developmental processes. Zebrafish are particularly valuable in high-throughput screening due to their small size and rapid life cycle (reaching maturity in 3 months). Initially adopted in developmental biology, the model now spans cancer research, neurobiology, and regenerative medicine. Its transparency during early stages allows non-invasive imaging, while genetic manipulation tools like CRISPR-Cas9 enhance precision. Regulatory agencies such as the OECD endorse zebrafish protocols for toxicity testing (e.g., OECD TG 236).
Key Features
Zebrafish share critical physiological pathways with mammals, including cardiovascular and nervous systems, making them predictive for human responses. Their embryos are permeable to small molecules, facilitating drug absorption studies. Automated imaging systems enable large-scale phenotypic screening, reducing costs compared to rodent models. Another feature is the zebrafish’s regenerative capacity, useful in studying tissue repair mechanisms. Researchers can generate transgenic lines to model diseases like Alzheimer’s or diabetes. However, limitations include differences in metabolism and the absence of certain mammalian organs (e.g., lungs).
Application Areas
In drug development, zebrafish tests identify compound toxicity and efficacy early in pipelines, saving time and resources. Pharmaceutical companies use them for cardiotoxicity screening (avoiding costly late-stage failures) and angiogenesis studies in cancer research. Environmental toxicology applications include assessing water pollutant effects via biomarkers. Academic labs employ zebrafish to study gene function and behavior. Recently, the model gained traction in personalized medicine, where patient-derived xenografts are tested in zebrafish avatars.
Precautions
Standardized housing (28.5°C, pH 7–8) and nutrition are essential to maintain zebrafish health. Ethical guidelines mandate minimizing animal distress; anesthesia is required for invasive procedures. Researchers must comply with institutional animal care committees (IACUC) and local regulations. Data variability can arise from strain differences or water quality fluctuations. Cross-validation with mammalian models is recommended for translational research. Contamination risks necessitate quarantining new fish stocks.
B2B Procurement Guide
When outsourcing zebrafish testing, prioritize vendors with AAALAC accreditation or ISO 17025 certification. Key selection criteria include turnaround time (typically 2–8 weeks), available endpoints (e.g., teratogenicity, gene expression), and reporting formats (raw data vs. interpreted results). Costs depend on study complexity; a basic toxicity assay may cost ~$1,200, while genetic modification projects exceed $3,000. Bulk pricing is negotiable for recurring projects. Ensure contracts cover data ownership and confidentiality. Domestic providers reduce logistical risks compared to international suppliers.
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