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Related Experiment Videos

Selection for body weight induces differences in exploratory behavior and learning in mice.

Elzbieta Wirth-Dzieciołowska1, Anita Lipska, Małgorzata Wesierska

  • 1Department of Genetics and Animal Breeding, Agricultural University of Warsaw, 8 Ciszewskiego Str. 02- 876 Warsaw, Poland.

Acta Neurobiologiae Experimentalis
|September 1, 2005
PubMed
Summary

Mice selectively bred for low body weight exhibited increased anxiety and impaired spatial learning compared to heavy and control lines. These behavioral differences were observed across multiple age groups in exploratory and learning tasks.

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Area of Science:

  • Behavioral Neuroscience
  • Animal Models
  • Genetics

Background:

  • Selective breeding over 108 generations for body weight impacts physiological and behavioral traits.
  • Understanding the genetic and behavioral consequences of long-term artificial selection is crucial.

Purpose of the Study:

  • To investigate the exploratory behavior and spatial learning abilities of mice from lines selectively bred for low (L), heavy (C), and control (K) body weight.
  • To determine if long-term selection for body weight influences anxiety-related behaviors and cognitive performance.

Main Methods:

  • Mice from L, C, and K lines across three age groups (PN-21, PN-56, PN-90) were tested in the open field (OF) and Lashley maze (LM).
  • Behavioral activity, habituation, and anxiety-related behaviors (defecation/urination) were recorded in the OF.

Related Experiment Videos

  • Spatial learning was assessed through repeated trials in the LM.

    • Main Results:

    • Low weight (L) mice showed increased behavioral activity initially in the OF but lower overall activity compared to C and K mice.
    • L mice displayed higher defecation/urination scores, indicative of increased anxiety.
    • L mice performed significantly worse in the spatial learning task (LM) compared to C and K mice.

    Conclusions:

    • Selective breeding for low body weight is associated with heightened anxiety and diminished spatial learning capabilities.
    • The L line exhibits distinct behavioral phenotypes compared to the C and K lines, suggesting a link between body weight selection and behavioral traits.