Two families with frontotemporal dementia with parkinsonism linked to chromosome 17 (FTDP-17) resulting from the microtubule associated protein tau (MAPT) gene IVS10+16C>T splice site mutation are reported, members of which showed variable clinical phenotypes at presentation. Possible explanations for the intra- and interfamilial clinical heterogeneity associated with this MAPT mutation are discussed.
Cognitive Function Clinic, Walton Centre for Neurology and Neurosurgery, Lower Lane, Fazakerley, Liverpool L9 7LJ, United Kingdom. a.larner@thewaltoncentre.nhs.uk