TY - JOUR T1 - De novo seven extra repeat expanded mutation in the PRNP gene in an Italian patient with early onset dementia JF - BMJ Case Reports DO - 10.1136/bcr.08.2008.0711 VL - 2009 SP - bcr0820080711 AU - M Cannella AU - Tiziana Martino AU - Maria Simonelli AU - Andrea Ciammola AU - Roberto Gradini AU - Andrea Ciarmiello AU - Fernando Gianfrancesco AU - Ferdinando Squitieri Y1 - 2009/01/01 UR - http://casereports.bmj.com/content/2009/bcr.08.2008.0711.abstract N2 - Point and octapeptide repeat (24 bp) insertional mutations in the prion protein gene (PRNP) cause a dominantly transmitted dementia, associated with spongiform degeneration of the brain, astrocytic gliosis and neuronal loss due to cell accumulation of mutated protease resistant prion protein. The octapeptide repeat region lies between codon 51 and 91, and comprises a nonapeptide followed by a tandem repeat containing four copies of an octapeptide. The normal tandem length in healthy individuals is five repeats R1-R2-R2-R3-R4, but mutations can contain up to nine additional extra repeats. Some insight into this genetic mechanism comes from the de novo meiotic insertional extra repeat mutation in PRNP we detected in a patient whose parents had a normal phenotype and a wild-type sequence in the same gene. To our knowledge, this is the first time this condition has been described. ER -