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[Prion diseases--general aspect]
Abstract:
Prion diseases are characterized by the accumulation of prion protein(PrP) with abnormal configuration in the brain. PrP itself is a host gene-encoded glycoprotein composing cell membrane, and the PrP detected in prion diseases is its isoform. The function of normal PrP is not fully understood but may play a preventing role in the cell death mechanism. In human, prion diseases are divided into two types, hereditary (autosomal dominant) type and sporadic one. In hereditary prion diseases, 16 different pathogenic mutations of the PrP gene have been discovered and each mutation exhibits distinguishable clinical pictures. In sporadic prion diseases such as Creutzfeldt-Jakob disease(CJD) the abnormal PrP is highly infectious. Although routes of transmission are not clarified in most CJD cases, there are reports of iatrogenic CJD and, recently, 14 cases of atypical CJD probably transmitted from bovine spongiform encephalopathy. The mechanism of replication of the abnormal PrP, however, remains unknown in CJD.
Insights
Prion diseases involve abnormal prion protein (PrP) accumulation in the brain. While normal PrP function is unclear, abnormal PrP causes infectious diseases like Creutzfeldt-Jakob disease (CJD).
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Context:
- Prion diseases are neurodegenerative disorders.
- Characterized by abnormal prion protein (PrP) accumulation in the brain.
- PrP is a host gene-encoded glycoprotein essential for cell membrane function.
Purpose:
- To describe the characteristics of prion diseases.
- To differentiate between hereditary and sporadic forms.
- To highlight the infectious nature and transmission routes of sporadic prion diseases like Creutzfeldt-Jakob disease (CJD).
Summary:
- Prion diseases stem from misfolded prion protein (PrP) accumulation.
- Hereditary forms have 16 known pathogenic PrP gene mutations.
- Sporadic forms, like CJD, are infectious, with potential iatrogenic and bovine spongiform encephalopathy transmission routes.
Impact:
- Understanding PrP's role in neurodegeneration.
- Clarifying disease mechanisms and transmission.
- Informing diagnostic and therapeutic strategies for prion diseases.