Patients carrying the mutation p.R406W in MAPT present with non-conforming phenotypic spectrum
| العنوان: | Patients carrying the mutation p.R406W in MAPT present with non-conforming phenotypic spectrum |
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| المؤلفون: | Helena Gossye, Sara Van Mossevelde, Anne Sieben, Maria Bjerke, Elisabeth Hendrickx Van de Craen, Julie van der Zee, Peter P De Deyn, Jan De Bleecker, Jan Versijpt, Jenneke van den Ende, Olivier Deryck, Paul Bourgeois, Jean-Christophe Bier, Maarten Goethals, Rik Vandenberghe, Sebastiaan Engelborghs, Christine Van Broeckhoven |
| المساهمون: | Neurology, Clinical Biology, Clinical sciences, Neuroprotection & Neuromodulation, Pathologic Biochemistry and Physiology |
| المصدر: | Brain |
| بيانات النشر: | Oxford University Press (OUP), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | genotype-phenotype correlations, Neuroscience(all), neurology, tauopathy, MAPT, Human medicine, Genotype-phenotype correlations, Neurology (clinical), Biology, Alzheimer’s disease, frontotemporal dementia |
| الوصف: | The missense mutation p.R406W in microtubule-associated protein tau leads to frontotemporal lobar degeneration with an amnestic, Alzheimer's disease-like phenotype with an autosomal dominant pattern of inheritance. In 2003, we described the pedigree of a Belgian family, labelled ADG, with 28 p.R406W patients. Over 18 years follow-up, we extended the family with 10 p.R406W carriers and provided an in-depth clinical description of the patients. Additionally, genetic screening was used to identify p.R406W carriers in Belgian cohorts of frontotemporal dementia and Alzheimer's disease patients and to calculate p.R406W frequency. In the frontotemporal dementia cohort, we found four p.R406W carriers (n = 647, 0.62%) and three in the Alzheimer's disease cohort (n = 1134, 0.26%). Haplotype sharing analysis showed evidence of a shared haplotype suggesting that they are descendants of a common ancestor. Of the p.R406W patients, we describe characteristics of neuropsychological, imaging and fluid biomarkers as well as neuropathologic examination. Intriguingly, the phenotypic spectrum among the p.R406W patients ranged from typical behavioural variant frontotemporal dementia to clinical Alzheimer's disease, based on CSF biomarker analysis and amyloid PET scan. Heterogeneous overlap syndromes existed in between, with highly common neuropsychiatric symptoms like disinhibition and aggressiveness, which occurred in 100% of frontotemporal dementia and 58% of clinical Alzheimer's disease patients. This was also the case for memory problems, 89% in frontotemporal dementia and 100% in clinical Alzheimer's disease patients. Median age at death was significantly lower in patients with frontotemporal dementia (68 years) compared to clinical Alzheimer's disease patients (79 years), although the sizes of the sub-cohorts are limited and do not allow prognostic predictions. Post-mortem brain analysis of one p.R406W patient with behavioural variant frontotemporal dementia revealed frontotemporal lobar degeneration with tau pathology. Notably, neuropathological investigation showed only 3R tau isoforms in the absence of 4R tau reactivity, an unusual finding in microtubule-associated protein tau-related frontotemporal lobar degeneration. No traces of amyloid pathology were present. Prevalence of the p.R406W mutation was relatively high in both frontotemporal dementia and Alzheimer's disease Belgian patient cohorts. These findings grant new insights into genotype-phenotype correlations of p.R406W carriers. They may help in further unravelling of the pathophysiology of this tauopathy and in facilitating the identification of patients with p.R406W-related frontotemporal lobar degeneration, both in clinical diagnostic and research settings. ispartof: BRAIN vol:146 issue:4 pages:1624-1636 ispartof: location:England status: published |
| وصف الملف: | |
| تدمد: | 1460-2156 0006-8950 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b5e684f5db3e9008a9b44b2093b23ecTest https://doi.org/10.1093/brain/awac362Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....7b5e684f5db3e9008a9b44b2093b23ec |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14602156 00068950 |
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