Two brothers with frontotemporal dementia and parkinsonism with an N279K mutation of the tau gene

Objective: To characterize the clinical diagnostic features, neuropathologi c phenotype of tau deposition, and subunit structure of tau filaments in pa tients who had an asparagine-to-lysine substitution at codon 279 (the N279K missense mutation) of the gene for microtubule-associated tau protein. Bac kground: The N279K mutation is a causative genetic defect for pallidoponton igral degeneration in an American kindred that presents with frontotemporal dementia (FTD) and parkinsonism. Methods: The authors analyzed retrospecti vely the clinical symptoms of two Japanese brothers who carry this mutation . Postmortem neuropathologic and electron microscopic studies, and Western blot analysis of insoluble tau were performed to correlate tau-mediated les ions with neurologic deficits. Results: Both patients exhibited impairment in recent memory, parkinsonism, and corticospinal disturbances in addition to FTD. Parkinsonism in one patient was responsive temporarily to L-dopa. T here was intense tau deposition in the medial temporal cortices and upper a nd lower motor neurons with accompanying corticospinal tract degeneration. Two distinct tau isoforms with four microtubule-binding repeats, in hyperph osphorylated forms, were the primary constituents of insoluble tau, which a ggregated to the filamentous component, termed "paired tubules," in neurons , oligodendrocytes, and astrocytes. The elemental filaments were hollow tub ules measuring 11 to 12 nm in diameter, two of which adhered to each other along their longitudinal axes to form "paired tubules." Conclusions: Early memory loss and pyramidal signs, which are atypical of FTD, can be presenti ng symptoms in this disorder. The authors demonstrated that the subunit str ucture of tau filaments is a pair of hollow tubules despite the prevailing twisted ribbon model.