ZeTox – Toxicology Services


icon-developmental-tox-and-teratogenicity DevTox – Developmental Toxicology

Developmental Toxicity assay is an optimized method for an enhanced prediction and description of teratogenicity. The broad number of phenotypes tested and the accurate quantification of subtle morphometric changes provides an integral teratogenic profile of your chemical candidate.


Predictability levels referred to rodents and humans above 80%.

Automated platform to process high amounts of larvae.

Mathematical-based approach that increases objectivity of verdicts. 

Evaluation of an extensive panel of phenotypes.

Estimation of teratogenic potencies through teratogenic indexes.

Good Laboratory Practice (GLP) like studies.

Method description

Incubation of embryos with 5 different concentrations of the molecule of interest spaced by a constant factor 2 from 0 to 96 hours post fertilization (hpf). Subsequent automated imaging and evaluation of teratogenicity through a validated panel of phenotypes. Finally, the relationship between mortality and teratogenicity is calculated to determine teratogenic potency (teratogenic index).


Determination of the following parameters at 24 and 96 hpf:

  • LOEC: Lowest Observable Effect Concentration
  • LC50: Lethal Concentration 50

Determination of the following parameters at 96 hpf:

  • AC50: Active Concentration 50 for each phenotype
  • TI: Teratogenic index
Figure 1. Dose-response curves for teratogenicity (light blue) and mortality (dark blue) at 96 hpf after exposure of embryos to a toxic compound.
Figure 2. Phenotypical panel: examples of developmental defects in embryos exposed to different toxic compounds.


  1. Jarque S, Rubio-Brotons M, Ibarra J, Ordoñez V, Dyballa S, Miñana R, Terriente J. 2020. Morphometric analysis of developing zebrafish embryos allows predicting teratogenicity modes of action in higher vertebrates. Reprod Toxicol. 96:337–348.