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About 10\u201315% of the human prion diseases are caused by a pathogenic variant in the prion protein (PrP) gene (\n                    <jats:italic>PRNP<\/jats:italic>\n                    ), and the most common genetic human prion disease is CJD (gCJD) linked to a glutamic acid to lysine substitution at codon 200 (E200K) of\n                    <jats:italic>PRNP<\/jats:italic>\n                    . The polymorphic codon 129 methionine (M)\/valine (V) genotype has a strong effect on disease phenotype. In the present study, we retrospectively evaluated many features of gCJD E200K cases with respect to the 129MV polymorphism, type of scrapie prion protein (PrP\n                    <jats:sup>Sc<\/jats:sup>\n                    ), demographic, clinical, laboratory, histopathology, and molecular features, including western blot examination and real-time quaking-induced conversion assay. Analyses were also performed to determine statistically significant features between E200K haplotypes (e.g., codon 129 genotype in\n                    <jats:italic>cis<\/jats:italic>\n                    with the mutated allele) and codon 129 genotypes. This study found that codon 129 polymorphism affects several disease features of gCJD E200K. Specifically, histopathologic differences were found between patients with different 129 haplotypes and genotypes. We have identified five groups or subtypes of E200K associated with either PrP\n                    <jats:sup>Sc<\/jats:sup>\n                    type 1 or 2. Other E200K cases showed mixed (i) PrP\n                    <jats:sup>Sc<\/jats:sup>\n                    types or (ii) pathological features of 129\u00a0M and 129\u00a0V haplotypes. To our knowledge, this study describes the largest cohort of 177 E200K cases and provides new insight into the wide range of phenotypes associated with this common CJD genetic variant.\n                  <\/jats:p>","DOI":"10.1007\/s00401-026-02975-x","type":"journal-article","created":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T13:20:40Z","timestamp":1768310440000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Genetic Creutzfeldt-Jakob disease linked to the E200K mutation: a large cohort study"],"prefix":"10.1007","volume":"151","author":[{"given":"Brian S.","family":"Appleby","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matteo","family":"Manca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Megan S.","family":"Piazza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Travis D.","family":"Kerr","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Cornacchia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alberto","family":"Bizzi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Allison","family":"Kraus","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark L.","family":"Cohen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ignazio","family":"Cali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,1,13]]},"reference":[{"key":"2975_CR1","doi-asserted-by":"publisher","DOI":"10.3389\/fneur.2022.1003056","volume":"13","author":"BS Appleby","year":"2022","unstructured":"Appleby BS, Shetty S, Elkasaby M (2022) Genetic aspects of human prion diseases. 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