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The tau gene in progressive supranuclear palsy: exclusion of mutations in coding exons and exon 10 splice sites, and identification of a new intronic variant of the disease-associated H1 haplotype in Italian cases.

Bonifati V., Joosse M., Nicholl D.J., Vanacore N., Bennett P., Rizzu P., Fabbrini G., Marconi R., Colosimo C., Locuratolo N., Stocchi F., Bonuccelli U., De Mari M., Wenning G., Vieregge P., Oostra B., Meco G., Heutink P.

Mutations in coding exons or exon 10 5'-splice-site of the gene for microtubule-associated protein tau can cause chromosome 17-linked frontotemporal dementia and parkinsonism (FTDP-17). We sequenced the 11 coding exons plus exon-intron boundaries of the tau gene in 15 cases of progressive supranuclear palsy (PSP), and found no mutations in coding exons or exon ten 5'-splice sites. These data indicate that typical PSP is not associated with tau gene mutations similar to those causing FTDP-17. We also observed a +39deltaG base change in the intron following exon 4 in three out of 69 PSP cases (all three Italians), whereas it was not found in 150 Dutch controls and once in 112 Italian controls. The +39deltaG variant arose in the context of the PSP-associated tau H1 haplotype. Although a pathogenic role cannot be entirely excluded, +39deltaG is likely to be a rare polymorphism that may be in linkage disequilibrium with a biologically relevant locus inside or near to the tau gene.

Neurosci. Lett. 274:61-65(1999) [PubMed] [Europe PMC]

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