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FETAX interlaboratory validation study: phase III--Part 1 testing
J A Bantle1, R A Finch, D T Burton
1Department of Zoology, Oklahoma State University, Stillwater 74078, USA.
Journal of Applied Toxicology : JAT
|November 1, 1996
Summary
The Frog Embryo Teratogenesis Assay-Xenopus (FETAX) is a reliable developmental toxicity assay. Validation studies show FETAX is repeatable and comparable to other bioassays for ecotoxicology and detecting toxicants.
Area of Science:
- Developmental toxicology
- Ecotoxicology
- Biomonitoring
Background:
- The Frog Embryo Teratogenesis Assay-Xenopus (FETAX) is a 96-hour whole embryo assay.
- It is utilized in ecotoxicology and for detecting mammalian developmental toxicants with in vitro metabolic activation.
- Standardized guidelines and an atlas exist for FETAX conduct.
Purpose of the Study:
- To evaluate the repeatability and reliability of the FETAX assay.
- To assess FETAX performance through a three-phase interlaboratory validation study.
- To identify and address sources of variability in FETAX results.
Main Methods:
- A three-phase interlaboratory validation study involving seven participants.
- Standardized FETAX protocol with published guidelines and atlas.
- Testing of coded samples and concentration ranges, with analysis of technician judgment and concentration selection.
Main Results:
- Phase I indicated FETAX is more repeatable and reliable than many bioassays, though some variation occurred.
- Phase II demonstrated reduced intra- and interlaboratory variability compared to Phase I.
- Variability was noted in technician judgment of malformations and concentration range selection, leading to protocol adjustments.
Conclusions:
- FETAX demonstrates good repeatability and reliability, comparable to other standard bioassays.
- Experience and standardized protocols are crucial for minimizing variability.
- The assay is a valuable tool for developmental toxicity screening in ecotoxicology.