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[Jactstio capitis--motor stereotypy in rodents]

V G Kolpakov, N N Barykina, P M Borodin

    Genetika
    |January 1, 1976
    PubMed
    Summary

    Jactatio capitis, a head-body movement disorder, can spontaneously occur in rodents during emotional excitement. This condition is linked to specific gene effects influencing coat color and is associated with audiogenic seizure susceptibility.

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    Area of Science:

    • Neuroscience
    • Genetics
    • Animal Behavior

    Context:

    • Jactatio capitis, a stereotyped hyperkinesis, is characterized by pendulum-like head and body motions.
    • Previously observed as drug-induced, this behavior can manifest spontaneously in rodents under emotional stress.

    Purpose:

    • To investigate the spontaneous occurrence and genetic underpinnings of jactatio capitis in rats and mice.
    • To explore the relationship between jactatio capitis, coat color genetics, emotionality, and seizure susceptibility.

    Summary:

    • Spontaneous jactatio capitis was observed in rats and mice, with frequency correlating with inbreeding levels.
    • Hybridological analysis linked jactatio capitis to suppressed eumelanin synthesis and pleiotropic gene effects (c or pp genotypes) affecting coat color.
    • The condition occurs in albino and yellow rodents, but not in black, brown, or grey variants.
    • Jactatio capitis exhibited a negative correlation with emotionality (defecation) and a positive correlation with audiogenic seizure predisposition.
    • The authors suggest jactatio capitis is not serotonin-ergic and may represent a catatonic syndrome due to its association with 'freezing' behavior.

    Impact:

    • This study elucidates the genetic basis and behavioral correlates of jactatio capitis, offering insights into spontaneous stereotyped hyperkinesis.
    • Findings contribute to understanding gene-environment interactions in behavior and neurological conditions.
    • Identifies jactatio capitis as a potential model for studying catatonic syndromes and their genetic links.

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