title: Co-occurrence of types 1 and 2 PrP(res) in sporadic Creutzfeldt-Jakob disease MM1.
abstract: The genotype (M/M, M/V, or V/V) at polymorphic codon 129 of the human prion protein (PrP) gene and the type (1 or 2) of protease-resistant PrP (PrP(res)) in the brain are major determinants of the clinicopathological phenotypes of sporadic Creutzfeldt-Jakob disease (sCJD). According to this molecular typing system, sCJD has been classified into six subgroups (MM1, MM2, MV1, MV2, VV1, and VV2). Besides these pure subgroups, mixed cases presenting mixed neuropathological phenotypes and more than one PrP(res) type have been found in sCJD. To investigate the frequency of the co-occurrence of types 1 and 2 PrP(res) in sCJD patients classified as MM1, we produced type 2 PrP(res)-specific antibody Tohoku 2 (T2) that can specifically detect the N-terminal cleavage site of type 2 PrP(res) after protease treatment and examined brain samples from 23 patients with sCJD-MM1. Western blot analysis using the T2 antibody revealed that the minority type 2 PrP(res) could be detected in all sCJD-MM1 brain samples including those of the cerebellum where sCJD-MM2 prions rarely accumulate. These results show that the co-occurrence of types 1 and 2 PrP(res) within a single sCJD-MM1 patient is a universal phenomenon. The general co-occurrence of multiple PrP(res) fragments within a single prion strain questions the validity of the conventional molecular typing system.
authors.affiliation: Division of Neurological Science, Center for Prion Research, Tohoku University Graduate School of Medicine, Sendai, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kobayashi
authors.forename: Kenta
authors.initials: K
authors.lastname: Mizukoshi
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Iwasaki
authors.forename: Hajime
authors.initials: H
authors.lastname: Miyata
authors.forename: Yasuji
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Tetsuyuki
authors.initials: T
authors.lastname: Kitamoto
mesh_terms: D000368:Aged; D000818:Animals; D000906:Antibodies / Q000276:immunology; D016022:Case-Control Studies; D054022:Cerebrum / Q000378:metabolism / Q000473:pathology; D007562:Creutzfeldt-Jakob Syndrome / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D051379:Mice; D010446:Peptide Fragments / Q000378:metabolism; D010447:Peptide Hydrolases / Q000378:metabolism*; D058225:Plaque, Amyloid / Q000378:metabolism / Q000473:pathology; D000072002:Prion Proteins; D011328:Prions / Q000378:metabolism*
chemical_list: D000906:Antibodies; C512656:PRNP protein, human; D010446:Peptide Fragments; D000072002:Prion Proteins; D011328:Prions; D010447:Peptide Hydrolases