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Related Experiment Videos

Cerebellar abnormalities in the disabled (mdab1-1) mouse

E Gallagher1, B W Howell, P Soriano

  • 1Department of Anatomy and Neuroscience Research Group, Faculty of Medicine, The University of Calgary, Alberta, Canada.

The Journal of Comparative Neurology
|December 9, 1998
PubMed
Summary

The disabled-1 (mdab1) gene is crucial for mouse cerebellum development, causing abnormal Purkinje cell clustering and foliation when disrupted. This suggests mdab1 functions with Reelin in neural development pathways.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • The disabled-1 (mdab1) gene, a mouse homolog of Drosophila Disabled (dab), encodes an adaptor molecule vital for neural development.
  • Targeted disruption of the mdab1 gene in mice (mdab1-1) results in significant anomalies in brain development, particularly affecting the cerebrum, hippocampus, and cerebellum.

Purpose of the Study:

  • To investigate the specific histologic abnormalities in the cerebellum of mdab1-1 mutant mice.
  • To elucidate the role of mdab1 in cerebellar development and its relationship with the Reelin pathway.

Main Methods:

  • Histologic examination of mdab1-1 mutant mouse cerebella.
  • Immunohistochemical analysis using anti-zebrin II (adult) and anti-calbindin (newborn) to identify Purkinje cells.

Related Experiment Videos

  • Comparison of mutant cerebellum development with wild-type and reeler mutant models.

    • Main Results:

    • mdab1-1 mutant cerebella exhibit complete absence of foliation and central clustering of Purkinje cells.
    • Despite abnormalities, cerebellar lamination appears normal where Purkinje cells and the external granular layer are closely apposed.
    • Purkinje cells in mdab1-1 mutants display a distorted parasagittal banding pattern, distinct from wild-type but retaining some organization.

    Conclusions:

    • Cerebellar development in mdab1-1 mutants shows parallels with reeler mutants, suggesting involvement in a related developmental pathway.
    • Given retained Reelin expression in mdab1-1 mutants, the mDab1 protein likely acts in a parallel or downstream pathway to Reelin.
    • These findings indicate mDab1's critical role in transforming embryonic Purkinje cell clusters into the adult parasagittal organization, potentially interacting with the Reelin signaling cascade.