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Related Experiment Videos

Behavioral differences among 129 substrains: implications for knockout and transgenic mice.

Melloni N Cook1, Valerie J Bolivar, Melanie P McFadyen

  • 1Genomics Institute, Albany, New York 12201-2002, USA.

Behavioral Neuroscience
|August 1, 2002
PubMed
Summary

Genetic background matters in research. Different 129 substrains of knockout mice exhibit distinct behaviors, impacting experimental results. Understanding these genetic variations is crucial for accurate data interpretation.

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Area of Science:

  • Neuroscience
  • Genetics
  • Animal Behavior

Background:

  • Most knockout (KO) mouse models utilize embryonic stem cells from the 129 strain.
  • KO strains are often backcrossed to the B6 strain, retaining 129 genetic material.
  • This residual 129 genome can confound results, attributing phenotypes to passenger genes rather than the targeted locus.

Purpose of the Study:

  • To investigate behavioral differences among various 129 substrains.
  • To assess the impact of genetic background on mouse behavior.
  • To highlight potential confounds in knockout mouse research.

Main Methods:

  • Seven distinct 129 substrains were evaluated.
  • A comprehensive battery of behavioral tasks was employed.
  • Key assessments included the zero-maze, open field habituation, cued fear conditioning, and rotorod performance.

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Main Results:

  • Significant variations in anxiety-related behaviors were observed in the zero-maze.
  • Differences in habituation to the open field were noted.
  • Cued fear conditioning performance varied across substrains.
  • All tested substrains performed comparably on the rotorod task.

Conclusions:

  • Substantial behavioral divergence exists among 129 substrains.
  • These genetic differences can significantly influence experimental outcomes.
  • Careful consideration of the 129 substrain background is essential for robust knockout mouse research.