Abstract
A missense variant from methionine to arginine at codon 232 (M232R) of the prion protein gene accounts for ~ 15% of Japanese patients with genetic prion diseases. However, pathogenic roles of the M232R substitution for the induction of prion disease have remained elusive because family history is usually absent in patients with M232R. In addition, the clinicopathologic phenotypes of patients with M232R are indistinguishable from those of sporadic Creutzfeldt-Jakob disease patients. Furthermore, the M232R substitution is located in the glycosylphosphatidylinositol (GPI)-attachment signal peptide that is cleaved off during the maturation of prion proteins. Therefore, there has been an argument that the M232R substitution might be an uncommon polymorphism rather than a pathogenic mutation. To unveil the role of the M232R substitution in the GPI-attachment signal peptide of prion protein in the pathogenesis of prion disease, here we generated a mouse model expressing human prion proteins with M232R and investigated the susceptibility to prion disease. The M232R substitution accelerates the development of prion disease in a prion strain-dependent manner, without affecting prion strain-specific histopathologic and biochemical features. The M232R substitution did not alter the attachment of GPI nor GPI-attachment site. Instead, the substitution altered endoplasmic reticulum translocation pathway of prion proteins by reducing the hydrophobicity of the GPI-attachment signal peptide, resulting in the reduction of N-linked glycosylation and GPI glycosylation of prion proteins. To the best of our knowledge, this is the first time to show a direct relationship between a point mutation in the GPI-attachment signal peptide and the development of disease.
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Data availability
The data that support the findings are available from the corresponding author upon request. The mass spectrometry proteomics data have been deposited to the ProteomeXchange Consortium via the PRIDE partner repository with the dataset identifier PXD037584 and 10.6019/PXD037584.
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Acknowledgements
We thank members of the Creutzfeldt-Jakob Disease Surveillance Committee in Japan, Creutzfeldt-Jakob disease specialists in the prefectures, and Creutzfeldt-Jakob disease patients and families for providing important clinical information. We thank Hiroko Kudo, Miyuki Yamamoto, Ayumi Yamazaki, and Akinori Ninomiya for their excellent technical assistance.
Funding
This work was supported by JSPS KAKENHI Grant Number 18K05963 (AK), The Kato Memorial Trust for Nambyo Research (AK), Takeda Science Foundation (AK), The Akiyama Life Science Foundation (AK), The Ichiro Kanehara Foundation (AK), The Suhara Memorial Foundation (AK), JST ACT-X Grant Number JPMJAX201B (TH), and JSPS KAKENHI Grant Number 21H02415 (TKin).
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AK, TH: conceptualization; TKin, SM, TKit: methodology; AK, TH, TS, YMu, JNK, RH, AT, YMa, SK, DK, YI: investigation; AK, TH, TS, JNK, RH, SK, DK: visualization; AK, TH, TKin: funding acquisition; AK: project administration; KA, TKim, TKin, SM, TKit: Supervision; AK, TH, TS: writing—original draft; KA, TKim, TKin, SM, TKit: writing—review & editing.
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This study was approved by the Institutional Ethics Committee of Hokkaido University Faculty of Veterinary Medicine (VET27-1, VET1-5). All experiments using human materials were in compliance with the Helsinki Declaration. Animal experiments were performed in strict accordance with the Regulations for Animal Experiments and Related Activities at Hokkaido University and Fundamental Guidelines for Proper Conduct of Animal Experiment and Related Activities in Academic Research Institutions by the Ministry of Education, Culture, Sports, Science and Technology in Japan, Notice No. 71. Protocols for animal experiments were approved by the Institutional Animal Care and Use Committees of Hokkaido University (14-0170, 19-0025).
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Kobayashi, A., Hirata, T., Shimazaki, T. et al. A point mutation in GPI-attachment signal peptide accelerates the development of prion disease. Acta Neuropathol 145, 637–650 (2023). https://doi.org/10.1007/s00401-023-02553-5
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DOI: https://doi.org/10.1007/s00401-023-02553-5