Related Experiment Videos
Prion disease with 144 base pair insertion in a Japanese family line
T Oda1, T Kitamoto, J Tateishi
1Department of Neuropsychiatry, National Shimofusa Sanatorium, Chiba, Japan.
Abstract:
We describe an insert mutation in the prion protein (PrP) gene in a Japanese family line that encodes six octapeptide repeats. This is the second report to date of an inherited prion disease with a 144-base pair insertion, although the order of the repeat sequences differ from that reported for the disease in an English family line. The clinical features, like those of the English patients, were characterized by a slowly progressive generalized dementia with some neurological signs and cortical focal symptoms. Postmortem examination disclosed diffuse atrophy of cerebral gray matter and the cerebellar cortex; histologically, there were marked patchy and regional neuronal loss with astrocytosis in the frontal cortex, amygdala and hippocampus and PrP-immunoreactive plaques in the molecular layer of the cerebellum. These plaques were different from typical kuru plaques. The prion disease in the present Japanese family line is compared with that in the English family line.
Insights
A Japanese family with inherited prion disease shows a unique prion protein (PrP) gene mutation. This genetic prion disease presents with dementia and neurological symptoms, distinct from other familial forms.
Area of Science:
- Neuroscience
- Genetics
- Pathology
Background:
- Familial prion diseases are rare, often linked to mutations in the prion protein (PrP) gene.
- Understanding the genetic basis and clinical spectrum of these diseases is crucial for diagnosis and management.
Observation:
- A Japanese family presented with an inherited prion disease characterized by a 144-base pair insertion in the PrP gene, encoding six octapeptide repeats.
- Clinical manifestations included slowly progressive dementia, neurological signs, and cortical focal symptoms, similar to a previously reported English family.
Findings:
- Postmortem analysis revealed diffuse cerebral and cerebellar gray matter atrophy.
- Histopathology showed neuronal loss, astrocytosis in key brain regions, and unique PrP-immunoreactive plaques in the cerebellum, differing from kuru plaques.
Implications:
- This case highlights genetic heterogeneity in inherited prion diseases.
- Comparing this Japanese family's prion disease with the English family's provides insights into genotype-phenotype correlations in prion protein disorders.