Journal Article

Hereditary Pick's disease with the G272V tau mutation shows predominant three-repeat tau pathology

I. F. Bronner, B. C. ter Meulen, A. Azmani, L. A. Severijnen, R. Willemsen, W. Kamphorst, R. Ravid, P. Heutink and J. C. van Swieten

in Brain

Published on behalf of The Guarantors of Brain

Volume 128, issue 11, pages 2645-2653
Published in print November 2005 | ISSN: 0006-8950
Published online July 2005 | e-ISSN: 1460-2156 | DOI: http://dx.doi.org/10.1093/brain/awh591
Hereditary Pick's disease with the G272V tau mutation shows predominant three-repeat tau pathology

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Frontotemporal dementia and parkinsonism linked to chromosome 17 have been associated with mutations in the microtubule associated protein tau (MAPT or tau) gene. This disorder is characterized by a large spectrum of neuronal and glial tau lesions in different brain regions. Pick bodies were found in a family with hereditary Pick's disease with the G272V mutation and in several families with other tau mutations in exons 9 and 11–13. The biochemical composition of Pick bodies varies between these mutations. Until recently, no detailed biochemical characterization of G272V brain material was done owing to unavailability of fresh frozen brain material. We now report a detailed study using the immunohistochemistry, western blots and electron microscopy of two brains with the G272V mutation that recently became available. Both brains showed severe neuronal loss in the temporal cortex, whereas in the frontal cortex the loss was less; and abundant Pick bodies in the dentate gyrus of the hippocampus, and caudate nucleus. The Pick bodies consisted exclusively of three-repeat (3R) isoforms, as was demonstrated by isoform-specific antibodies and supported by western blot analysis of sarkosyl-insoluble tau. These observations confirm that this family diagnosed with hereditary Pick disease meets all the criteria for this condition, including the presence of Pick bodies that are unphosphorylated at Ser262 and contain twisted filaments with long periodicity consisting only of 3R tau.

Keywords: brain; focal dementias; neuronal degeneration; tau expression; NFT = neurofibrillary tangles; PSP = progressive supranuclear palsy; 3R = 3-repeat; 4R = 4-repeat

Journal Article.  5294 words.  Illustrated.

Subjects: Neurology ; Neuroscience

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