Neurofibrillary tangles are found in many neurologic diseases. Here we review the unusual characteristics of the MAPT locus, which shows genetic association with many of these diseases and in Caucasian populations, is the largest stretch of linkage disequilibrium in the genome. We discuss the reason for this disequilibrium, its evolutionary history, and the role of genetic variability at MAPT in the etiology of tauopathies.
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