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Related Concept Videos

Toxicity Testing in Animals01:23

Toxicity Testing in Animals

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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
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Teratogenicity01:07

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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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Related Experiment Video

Updated: Mar 24, 2026

Using Caenorhabditis elegans for Studying Trans- and Multi-Generational Effects of Toxicants
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Implementing the extended one-generation reproductive toxicity study (EOGRTS): important points to consider.

Manon Beekhuijzen1, Helma Barentsen1, Edward Marsden2

  • 1a WIL Research Europe , Den Bosch , the Netherlands ;

Critical Reviews in Toxicology
|March 5, 2016
PubMed
Summary
This summary is machine-generated.

The extended one-generation reproductive toxicity study (EOGRTS) offers a customizable, data-driven approach to reproductive toxicity testing. This method enhances F1-offspring assessments and significantly reduces animal usage compared to traditional studies.

Keywords:
3R’sDevelopmental immunotoxicityEU B.56OECD 443developmental neurotoxicityextended one-generation reproductive toxicity study (EOGRTS)triggers

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Area of Science:

  • Toxicology
  • Reproductive Toxicology
  • Animal Model Studies

Background:

  • Traditional two-generation reproductive toxicity studies involve extensive animal use.
  • The extended one-generation reproductive toxicity study (EOGRTS) was developed to optimize animal usage and data acquisition.
  • Regulatory requirements necessitate robust reproductive toxicity testing while minimizing animal numbers.

Purpose of the Study:

  • To review the design and implementation of the EOGRTS.
  • To highlight the advantages of EOGRTS over the traditional two-generation study.
  • To provide guidance on criteria for study expansion and logistical considerations.

Main Methods:

  • The EOGRTS utilizes specific criteria or triggers at weaning to assign offspring to specialized cohorts.
  • Assessments include sexual maturation, reproductive organ integrity, neuropathology, behavior, and immune function.
  • Data-driven triggers allow for a flexible and customized study design.

Main Results:

  • EOGRTS allows for increased number, extent, and duration of F1-offspring assessments.
  • The study design efficiently utilizes the first generation, avoiding the need for a second generation unless triggered.
  • Potential reduction of approximately 1200 rats per study compared to the two-generation study.

Conclusions:

  • EOGRTS provides a more thorough and efficient utilization of F1 offspring.
  • The study design has the potential to significantly reduce animal usage in reproductive toxicity testing.
  • Experienced laboratories with robust historical data are essential for successful EOGRTS implementation.