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Aneuploid neurons are functionally active and integrated into brain circuitry.

M A Kingsbury1, B Friedman, M J McConnell

  • 1Department of Molecular Biology, Helen L. Dorris Institute for the Study of Neurological and Psychiatric Disorders of Children and Adolescents, The Scripps Research Institute, 10550 North Torrey Pines Road, ICND 118, La Jolla, CA 92037, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 20, 2005
PubMed
Summary

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Genetic mosaicism in the brain is confirmed. Functioning neurons can have abnormal chromosome numbers (aneuploidy), forming complex neural circuits in mammals.

Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Aneuploid cells in the mammalian brain suggest genetic mosaicism's role in neural circuitry.
  • The identity and function of these aneuploid cells remain unclear, potentially being non-neuronal or non-viable.

Purpose of the Study:

  • To determine if aneuploid cells in the brain are neurons involved in direct signaling.
  • To investigate the functional activity of aneuploid neurons within neural circuits.

Main Methods:

  • Combined retrograde labeling with Fluorescence In Situ Hybridization (FISH) for chromosome-specific loci.
  • Utilized immediate early gene expression markers to assess neuronal activity.

Main Results:

  • Distantly labeled aneuploid neurons were identified in relevant anatomical projection areas.

Related Experiment Videos

  • Aneuploid neurons were found to be functionally active, indicated by immediate early gene expression.

    • Conclusions:

    • Functioning neurons with aneuploid genomes are a component of normal mammalian brain organization.
    • These results confirm that genetically mosaic neural circuits are formed by aneuploid neurons.