Gerstmann-Straussler-Scheinker (GSS) disease is a cerebral prion protein (PrP) amyloidosis associated with mutations in the PrP gene (PRNP). A GSS disease variant with mutation at codon 198 (F198S) has been studied in a large Indiana kindred. Biochemical investigations showed that the amyloid protein consists of 11 and 7 kDa fragments of PrP. Immunohistochemical studies showed that in addition to amyloid, these patients accumulate PrP deposits which are neither fluorescent nor birefringent when stained with thioflavin S and Congo red. In the present paper, we analyzed proteinase-K (PK)-resistant PrP in 7 patients with GSS F198S disease. Immunoblots of PK- treated brain extracts show prominent bands of ca. 27-29, 18-19), and 8 kDa. Immunohistochemistry and thioflavin-S-fluorescence show that the amyloid deposits are conspicuous in the cerebellum but sparse in the caudate nucleus. However, immunoblot analysis reveals PK-resistant PrP bands of similar intensity in both regions. Treatment with PK and PNGase F generates a pattern similar to that of PK alone. Our findings suggest that brain extracts from GSS F198S disease contain 3 prominent nonglycosylated PK resistant PrP fragments forming a pattern not previously described in other prion diseases, which may in part explain the pathology of this GSS disease variant.
|Number of pages||7|
|Journal||Journal of Neuropathology and Experimental Neurology|
|Publication status||Published - Nov 1996|
- Gerstmann-Straussler-Scheinker (GSS) disease
- Prion protein (PrP)
ASJC Scopus subject areas
- Pathology and Forensic Medicine