Clinical, neuropathological, and biochemical characterization of the novel tau mutation P332S.
MAPT mutations cause autosomal dominant frontotemporal lobar degeneration. These diseases are characterized by considerable heterogeneity in their clinical, neuropathological, and biochemical presentations. We describe the full characterization of a family with autosomal dominant frontotemporal lobar degeneration caused by a novel MAPT mutation. Clinical, imaging, neuropathological, and biochemical data are presented. The proband was a woman who died at 85 years old, 25 years after the onset of a slowly progressive and isolated anarthria and opercular syndrome. The pathological examination of her brain showed marked atrophy of primary motor and premotor cortices, associated with predominant neuronal tau-positive lesions mimicking Pick bodies. At the biochemical level, the six tau isoforms aggregate to display a pathological triplet at 60, 64, and 69 kDa. Two of her sons presented at 48 and 50 years old with a right temporal variant of frontotemporal degeneration characterized by severe prosopagnosia, semantic impairment, and behavioral modifications. In these three patients, the molecular analysis of MAPT showed the c.1945C>T mutation on exon 11 resulting in the P332S substitution in tau sequence. This mutation changes the PGGG motif of the third repeat domain of the protein and therefore reduces the ability of tau to bind microtubule. From a clinical point of view, this mutation is associated with considerable intrafamilial phenotypic variation.
Univ Lille Nord de France, UDSL, Lille, France.
Vincent
V
Deramecourt
Florence
F
Lebert
Claude-Alain
CA
Maurage
Francisco-Jose
FJ
Fernandez-Gomez
Simon
S
Dujardin
Morvane
M
Colin
Nicolas
N
Sergeant
Valérie
V
Buée-Scherrer
Fabienne
F
Clot
Isabelle Le
IL
Ber
Alexis
A
Brice
Florence
F
Pasquier
Luc
L
Buée
D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D057174:Frontotemporal Lobar Degeneration / Q000235:genetics* / Q000378:metabolism / Q000473:pathology*; D014644:Genetic Variation; D057809:HEK293 Cells; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype; D016875:tau Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
C054369:MAPT protein, human; D016875:tau Proteins