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Preliminary evidence for anticipation in genetic E200K Creutzfeldt-Jakob disease
H Rosenmann1, E Kahana, A D Korczyn
1Department of Neurology, Hadassah University Hospital, Jerusalem, Israel.
Insights
Creutzfeldt-Jakob disease (CJD) shows varied symptoms. Offspring with the E200K prion protein gene mutation experienced earlier onset than parents, suggesting anticipation possibly due to environmental or genetic factors.
Area of Science:
- Neurogenetics
- Prion Diseases
- Human Genetics
Background:
- Creutzfeldt-Jakob disease (CJD) is a fatal neurodegenerative disorder.
- The E200K mutation in the prion protein (PrP) gene is a common cause of genetic CJD.
- CJD exhibits significant phenotypic heterogeneity, particularly in age of onset.
Purpose of the Study:
- To investigate the age at disease onset in successive generations of families with the CJD E200K mutation.
- To explore the potential for anticipation in genetic CJD.
- To identify factors influencing disease onset variability.
Main Methods:
- Retrospective analysis of clinical and genetic data from families with the CJD E200K mutation.
- Comparison of age at onset between offspring and parent mutation carriers.
- Literature review for potential environmental or genetic modifiers.
Main Results:
- Mutation carriers in the offspring generation presented with an earlier age of onset compared to their affected parents.
- This generational difference suggests a potential anticipation phenomenon.
- The variability in onset age indicates the influence of other factors beyond the primary mutation.
Conclusions:
- The findings suggest anticipation may occur in E200K-linked CJD.
- An unidentified environmental or genetic factor likely influences the age of onset in different generations.
- Further research is needed to elucidate these modifying factors.
Abstract:
Creutzfeldt-Jakob disease (CJD) linked to the E200K mutation of the prion protein (PrP) gene presents within a wide range of phenotypic heterogeneity, including the age at disease onset. We report an earlier disease onset for mutation carriers of the offspring generation when compared with that of their parents, suggesting the possibility of anticipation. A still unidentified environmental or genetic element may affect the age at onset in mutation carriers of different generations.