Related Experiment Video
Updated: Nov 14, 2025
Protein Misfolding Cyclic Amplification of Prions
Published on: November 7, 2012
Genetic prion disease: D178N with 129MV disease modifying polymorphism-a clinical phenotype
Tracie Huey-Lin Tan1, Richard J Stark1,2, John A Waterston1
1Neurology, Alfred Health, Melbourne, Victoria, Australia.
Background:
Human prion diseases are a group of rare neurological diseases with a minority due to genetic mutations in the prion protein (PRNP) gene. The D178N mutation is associated with both Creutzfeldt-Jakob disease and fatal familial insomnia with the phenotype modified by a polymorphism at codon 129 with the methionine/valine (MV) polymorphism associated with atypical presentations leading to diagnostic difficulty.
Case:
We present a case of fatal familial insomnia secondary to a PRNP D178N mutation with 129MV disease modifying polymorphism who had no family history, normal MRI, electroencephalography (EEG), cerebrospinal fluid (CSF) and positron emission tomography findings and a negative real-time quaking-induced conversion result.
Conclusion:
Patients with genetic prion disease may have no known family history and normal EEG, MRI brain and CSF findings. PRNP gene testing should be considered for patients with subacute progressive neurological and autonomic dysfunction.
