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MAPT S305I mutation : implications for argyrophilic grain disease

Kovacs, G. G. and Pittman, A. and Revesz, T. and Luk, C. and Lees, A. and Kiss, E. and Tariska, P. and Laszlo, L. and Molnár, K. and Molnar, M. J. and Tolnay, M. and de Silva, R.. (2008) MAPT S305I mutation : implications for argyrophilic grain disease. Acta neuropathologica, Vol. 116, no. 1. pp. 103-118.

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Official URL: http://edoc.unibas.ch/dok/A6006102

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Abstract

Frontotemporal lobar degeneration (FTLD) with mutations in the tau gene (MAPT) causes familial frontotemporal dementia with tau pathology. Many of these mutations result in morphological phenotypes resembling sporadic tauopathies, although, to date, no such cases mimicking argyrophilic grain disease (AgD) have been documented. We now present a case with a novel S305I MAPT mutation and a morphological phenotype showing resemblance to AgD. At the age of 39, the patient developed behavioural and personality changes and lack of verbal fluency with later poor performance on naming tasks and rigidity in the extremities. After a short disease course of 1.5 years, the patient died. A unique neuropathological phenotype with neuronal diffuse cytoplasmic tau immunoreactivity, oligodendroglial-coiled bodies, argyrophilic grains, and non-argyrophilic, but tau-immunopositive and ubiquitin-immunonegative pre-grains were observed, whereas classical neurofibrillary tangles, Pick bodies, and neuritic plaques were absent. The tau-positive abnormal structures were composed only of 4R-tau isoforms and, ultrastructurally, straight filaments. Neuronal loss was greatest in the medial temporal cortex, hippocampus, and amygdala. These pathological features resemble AgD. The novel S305I substitution has a strong effect on MAPT exon 10 splicing, thereby causing a striking increase in 4R-tau isoforms. Our observation not only widens the phenotypic spectrum of FTLD with MAPT mutation but also underpins the notion that the predominance of similar neuropathological findings in sporadic AgD cases may be viewed as features of a distinct disease entity.
Faculties and Departments:03 Faculty of Medicine > Bereich Querschnittsfächer (Klinik) > Pathologie USB > Allgemeine Pathologie (Tolnay)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Querschnittsfächer (Klinik) > Pathologie USB > Allgemeine Pathologie (Tolnay)
UniBasel Contributors:Tolnay, Markus
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Springer
ISSN:0001-6322
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:08 Nov 2012 16:23
Deposited On:08 Nov 2012 16:22

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