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Updated: Aug 13, 2026
11:29
Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain
Published on: October 3, 2012
La proteína priónica humana con valina 129 impide la expresión del fenotipo variante de la ECJ
Jonathan D F Wadsworth1, Emmanuel A Asante, Melanie Desbruslais
1Medical Research Council (MRC) Prion Unit and Department of Neurodegenerative Disease, Institute of Neurology, University College London, Queen Square, London WC1N 3BG, UK.
Science (New York, N.Y.)
|November 13, 2004
Resumen
El genotipo de la proteína priónica humana (PrP) en el codón 129 influye en la encefalopatía espongiforme bovina (BSE) enfermedad priónica. La metionina 129 se requiere para el fenotipo variante de la enfermedad de Creutzfeldt-Jakob (vCJD), mientras que la valina 129 confiere resistencia.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología Molecular Biología Molecular
- Patología Patología Patología.
Sus antecedentes:
- La variante de la enfermedad de Creutzfeldt-Jakob (vCJD) es un trastorno neurodegenerativo fatal vinculado a priones de la encefalopatía espongiforme bovina (BSE).
- El gen de la proteína priónica humana (PrP) tiene un polimorfismo común en el codón 129, con metionina (M) o valina (V).
Objetivo del estudio:
- Investigar el papel del polimorfismo del codón PrP 129 humano en la transmisión y el fenotipo de las infecciones priónicas derivadas de la EEB.
- Para determinar si diferentes genotipos de PrP influyen en la cepa priónica resultante y las características de la enfermedad.
Principales métodos:
- Los ratones transgénicos que expresaban PrP humano con metionina 129 (PrP-129M) o valina 129 (PrP-129V) fueron inoculados con priones de la EEB.
- Análisis fenotípico de la enfermedad en ratones, incluido el período de incubación, la neuropatología y la tipificación de la cepa priónica.
Principales resultados:
- Los ratones transgénicos PrP-129M desarrollaron un fenotipo parecido a vCJD.
- Los ratones transgénicos PrP-129V exhibieron un fenotipo distinto y una barrera significativa para la transmisión de priones de la EEB, incluso en el subpasaje.
- El polimorfismo del codón 129 de la PrP humana dictó la propagación de cepas priónicas distintas después de la infección por priones de la EEB.
Conclusiones:
- El genotipo del codón PrP 129 humano es un determinante crítico del fenotipo y la transmisibilidad de las enfermedades priónicas derivadas de la EEB.
- Las infecciones humanas primarias y secundarias con priones de la EEB pueden conducir a diversos fenotipos clínicos y moleculares, incluidas formas esporádicas similares a la ECJ o nuevas, además de la ECJ v.
- Estos hallazgos ponen de relieve la compleja interacción entre la cepa priónica, el genotipo del huésped y la manifestación de la enfermedad en las enfermedades priónicas humanas.
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