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A murine model of a familial prion disease
David A Harris1, Roberto Chiesa, Bettina Drisaldi
1Department of Cell Biology and Physiology, Washington University School of Medicine, 660 South Euclid Ave., St. Louis, MO 63110, USA. dharris@cellbio.wustl.edu
Abstract:
We have produced a mouse model of a familial prion disorder by introduction of a transgene that encodes the moPrP homolog of a nine-octapeptide insertional mutant associated with an inherited form of CJD in humans. These mice develop progressive neurologic symptoms, display neuropathologic changes, and accumulate a form of mutant PrP in their brains and peripheral tissues that displays some of the biochemical properties of PrPSc. These mice have been extremely valuable for analyzing the cellular and biochemical mechanisms involved in inherited prion disorders and correlating the appearance of the PrPSc-like form with clinical and neuropathologic findings. Because the mutant protein in the mice is highly neurotoxic but appears to lack infectivity, further analysis of its properties promises to shed new light on the molecular distinction between pathogenic and infectious forms of PrP.
Insights
Researchers created a mouse model for inherited prion disorders. This model exhibits neurological symptoms and prion protein accumulation, aiding the study of disease mechanisms and the distinction between pathogenic and infectious prion forms.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Familial prion disorders are inherited neurodegenerative diseases.
- Creutzfeldt-Jakob disease (CJD) can have inherited forms linked to prion protein (PrP) gene mutations.
- Understanding the mechanisms of inherited prion diseases is crucial for developing therapies.
Purpose of the Study:
- To develop a mouse model that mimics human familial prion disorders.
- To investigate the cellular and biochemical processes underlying inherited prion diseases.
- To differentiate between the pathogenic and infectious properties of mutant prion protein.
Main Methods:
- Introduction of a transgene encoding a specific nine-octapeptide insertional mutant of mouse prion protein (moPrP).
- Observation and analysis of neurological symptoms, neuropathologic changes, and PrP accumulation in the mouse model.
- Biochemical characterization of the accumulated mutant PrP, comparing it to PrPSc.
Main Results:
- The developed mouse model exhibits progressive neurological symptoms and neuropathologic changes consistent with prion disorders.
- Mutant PrP accumulates in the brains and peripheral tissues of these mice.
- The accumulated mutant PrP shares some biochemical properties with PrPSc, the infectious form of the prion protein.
Conclusions:
- The mouse model is valuable for studying the mechanisms of inherited prion disorders.
- The model allows for the correlation of mutant PrP accumulation with clinical and neuropathologic findings.
- The mutant PrP in this model is neurotoxic but appears non-infectious, offering insights into the distinction between pathogenic and infectious prion protein forms.