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Related Experiment Videos

The prion gene complex encoding PrP(C) and Doppel: insights from mutational analysis.

P Mastrangelo1, D Westaway

  • 1Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, Ontario, Canada.

Gene
|September 28, 2001
PubMed
Summary
This summary is machine-generated.

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The prion protein (PrP) gene Prnp encodes a protein crucial for preventing neurotoxicity. Its paralogue, Prnd, encodes doppel (Dpl), whose overexpression causes cerebellar apoptosis, but this is reversed by Prnp.

Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • The prion protein gene (Prnp) encodes PrP(C), essential for normal function, and PrP(Sc), the agent of prion diseases like BSE.
  • Prnp gene-ablated mice (Prnp(0/0)) are healthy, suggesting PrP(C) has non-obvious functions or overlapping roles with other molecules.
  • A Prnp paralogue, Prnd, encodes the doppel (Dpl) protein, sharing structural similarities but lacking key PrP(C) domains.

Purpose of the Study:

  • To investigate the function of the prion protein (PrP) and its paralogue, doppel (Dpl).
  • To understand the implications of Prnd gene expression in the absence of Prnp.
  • To explore the potential interaction and competition between PrP(C) and Dpl in neuronal pathways.

Main Methods:

  • Analysis of Prnp gene-ablated mice (Prnp(0/0)) with naturally occurring Dpl overexpression.

Related Experiment Videos

  • Construction of transgenic mice expressing Dpl under the PrP promoter.
  • Assessment of neurological phenotypes, including ataxia and cerebellar cell apoptosis.
  • Evaluation of rescue effects using wild-type Prnp transgenes.

    • Main Results:

    • Prnp(0/0) mice with Dpl overexpression exhibit ataxia and cerebellar apoptosis, indicating Dpl's neurotoxicity.
    • Transgenic mice expressing Dpl under the PrP promoter confirm Dpl-induced neurotoxicity.
    • Neurological deficits in Dpl-expressing mice are rescued by the presence of wild-type Prnp transgenes.

    Conclusions:

    • Ectopic Dpl synthesis is toxic to central nervous system neurons, causing ataxia and apoptosis.
    • PrP(C) plays a protective role against Dpl-induced neurotoxicity.
    • Prnp and Prnd genes may interact within a common pathway, with competition between PrP(C) and Dpl potentially regulating neuronal survival.