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Related Concept Videos

Genetic Screens02:46

Genetic Screens

Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
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Human Pluripotent Stem Cell Based Developmental Toxicity Assays for Chemical Safety Screening and Systems Biology Data Generation
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Improving toxicity screening and drug development by using genetically defined strains.

Michael F W Festing1

  • 1Understanding Animal Research, London, UK.

Methods in Molecular Biology (Clifton, N.J.)
|December 17, 2009
PubMed
Summary

Using genetically diverse inbred rodents in toxicity testing significantly improves the detection of adverse effects. This approach enhances experimental power and reduces false negatives in drug safety assessments.

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Area of Science:

  • Toxicology and Pharmacology
  • Genetics and Animal Models
  • Drug Development and Safety Assessment

Background:

  • Current toxicity testing often uses genetically heterogeneous outbred rodents, increasing the risk of false-negative results and hindering accurate safety assessments.
  • Failures in clinical development due to unpredictable product safety significantly increase the cost of new drug development, as highlighted by the Food and Drug Administration.
  • Improving the design of animal experiments, specifically by controlling genetic variables, is a cost-effective method to enhance toxicity testing.

Purpose of the Study:

  • To demonstrate the advantage of using multiple isogenic (inbred or F1 hybrid) rodent strains over outbred stocks for toxicity testing.
  • To increase the signal-to-noise ratio and statistical power of toxicity experiments without increasing animal usage.
  • To highlight the benefits of using mice over rats in toxicological studies due to cost, substance usage, strain availability, and genetic analysis.

Main Methods:

  • Employed a multi-inbred strain approach, replacing outbred rodents with genetically diverse inbred strains in toxicity studies.
  • Utilized a factorial experimental design, for example, using two animals from each of five diverse inbred strains instead of ten outbred animals per treatment group.
  • Conducted parallel studies on the hematological response to chloramphenicol, comparing CD-1 outbred mice with four inbred mouse strains.

Main Results:

  • The use of multiple inbred strains significantly increased the signal-to-noise ratio and power of toxicity experiments.
  • Toxicity to the white blood cell lineage from chloramphenicol exposure was clearly detected in inbred strains but not in the outbred stock.
  • The multi-inbred strain approach allows for safety assessment using the most sensitive strain without increasing the total number of animals.

Conclusions:

  • Using genetically diverse inbred rodent strains in toxicity testing is superior to using outbred stocks for detecting adverse effects.
  • The multi-inbred strain strategy enhances experimental power, reduces false negatives, and improves the reliability of drug safety evaluations.
  • Toxicologists should adopt inbred rodent models, particularly mice, for more efficient, cost-effective, and sensitive toxicity testing.