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In contrast, little or no amplification was observed for the ~8 kDa PrPres either in VPSPr or a case of GSS associated with this PrPres subtype.
However, in our study we have shown that in a case of GSS (with ~8 kDa PrPres) any CDI detectable PrPres was eliminated with even mild PK treatment.
Samples from both patients were run alongside brain homogenates from sporadic and variant Creutzfeldt Jakob disease, a case of GSS (P102L-129M) and a case of protease sensitive prionopathy [ 11] for comparison of the relative mobility of the smaller fragment sizes.
A key distinction we observed in this study is the differing conformational stabilities of VPSPr PrPSc between cerebral cortex and cerebellum and no such difference in PrPSc stabilities was observed for a case of GSS P102L (type 1 PrPres) (Table 3).
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Frontal cortex and cerebellum from a case of sCJD (VV2 subtype) and two cases of GSS were analysed as controls.
The stability of PrPSc in various regions of a VPSPr brain, two cases of GSS and a case of sCJD VV2 was investigated by CDI following denaturation with various concentrations of GdnHCl.
These values are compared with frontal cortex from patients with sCJD (of the MM1, MM2 and VV2 subtypes), variant CJD, and two cases of GSS (both P102L mutation of PRNP).
For comparison, PMCA was also carried out on frontal cortex tissue from a case of sCJD (VV2 subtype) and two cases of GSS with the P102L mutation, one associated with ~8 kDa and the other associated with type 1 PrPres.
The only trend between sequence changes and disease phenotype is that most cases of GSS include 129V on the mutant allele, but the presence of this polymorphism in some familial CJD cases diminishes the correlation.
Stability analysis of the PrPSc conformer was performed on two cases of GSS with the P102L mutation (one associated with an ~8 kDa PrPres and the other associated with the typical three-band type 1 PrPres following western blot analysis) and on various brain regions from VPSPr case 1, for which multiple brain regions were available (Table 2).
The brain homogenates used as substrates were prepared from either frontal cortex of non-CJD patients, or humanised transgenic mouse brain, with compatible PRNP-codon 129 genotypes (VV in the case of VPSPr and sCJD VV2 subtype) and MM for both cases of GSS).
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