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Double-knockout mice for alpha- and beta-synucleins: effect on synaptic functions.

Sreeganga Chandra1, Francesco Fornai, Hyung-Bae Kwon

  • 1Center for Basic Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 7, 2004
PubMed
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Synucleins, alpha- and beta-, are not essential for basic brain function or neurotransmitter release. However, their absence in mice alters dopamine levels and specific synaptic proteins, suggesting a role in presynaptic maintenance.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Alpha-synuclein is implicated in Parkinson's disease pathogenesis.
  • The precise function of alpha- and beta-synuclein remains unclear due to potential functional redundancy.

Purpose of the Study:

  • To systematically investigate the in vivo functions of alpha- and beta-synucleins.
  • To determine the necessity of synucleins for basic neuronal functions and synaptic vesicle dynamics.

Main Methods:

  • Generation of single and double knockout mice lacking alpha- and/or beta-synuclein.
  • Assessment of brain function, survival rates, synaptic ultrastructure, synaptic plasticity, and vesicle dynamics.
  • Quantification of neurotransmitter levels (dopamine, serotonin) and neurotransmitter uptake/release.

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Main Results:

  • Synuclein knockout mice exhibited normal brain function, survival, synaptic structure, plasticity, and vesicle dynamics.
  • Deletion of synucleins led to altered levels of complexins and 14-3-3 proteins.
  • Double knockout mice showed a ~20% reduction in brain dopamine levels, while single knockouts did not.

Conclusions:

  • Synucleins are not essential for fundamental neurotransmitter release machinery.
  • Synucleins may play a role in the long-term regulation and maintenance of presynaptic function.
  • These findings provide insights into the non-essential but regulatory roles of synucleins in the brain.