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Related Experiment Videos

Aggressive behavioral phenotypes in mice.

K A Miczek1, S C Maxson, E W Fish

  • 1Department of Psychology, Bacon Hall, Tufts University, 530 Boston Avenue, Medford, MA 02155, USA. kmiczek@emerald.tufts.edu

Behavioural Brain Research
|October 30, 2001
PubMed
Summary
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Aggressive behavior in mice is heritable, influenced by multiple genes and environmental factors. While specific gene deletions alter aggression, polygenic influences and the serotonin system appear crucial.

Area of Science:

  • Ethology
  • Behavioral Genetics
  • Neuroscience

Background:

  • Aggressive behavior in mice is a complex, heritable trait crucial for reproductive success.
  • Fighting involves species-typical behaviors with distinct offensive and defensive roles.
  • Ethological methods quantify aggressive behavior patterns.

Purpose of the Study:

  • Investigate the genetic and environmental influences on mouse aggression.
  • Examine the impact of gene deletions on aggressive behavior.
  • Identify potential common mechanisms underlying altered aggression.

Main Methods:

  • Classic selection and strain comparisons to assess heritability.
  • Analysis of gene deletion mutants (KO mice).
  • Quantification of behavioral patterns using ethological methods.

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Main Results:

  • Aggression is polygenic, with gene effects dependent on genetic background, maternal environment, and intruder.
  • Gene deletions can alter aggressive behavior, but no single gene product is consistently linked to increases or decreases.
  • Alterations in serotonin (5-HT) neurotransmission are observed in some KO mice with unusual aggression.

Conclusions:

  • Mouse aggressive behavior is shaped by complex genetic and environmental interactions.
  • Polygenic inheritance and background strain significantly modulate aggression.
  • The serotonin system may represent a common pathway influencing aggressive behavior in genetically modified mice.