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  • 1.
    Paucar, Martin
    et al.
    Karolinska institutet.
    Xiang, Fengqing
    Moore, Richard
    Walker, Ruth
    Winnberg, Elisabeth
    Svenningsson, Per
    Genotype-phenotype analysis in inherited prion disease with eight octapeptide repeat insertional mutation.2013In: Prion, ISSN 1933-6896, E-ISSN 1933-690X, Vol. 7, no 6, p. 501-10, article id 27260Article in journal (Refereed)
    Abstract [en]

    A minority of inherited prion diseases (IPD) are caused by four to 12 extra octapeptide repeat insertions (OPRI) in the prion protein gene (PRNP). Only four families affected by IPD with 8-OPRI have been reported, one of them was a three-generation Swedish kindred in which four of seven affected subjects had chorea which was initially attributed to Huntington's disease (HD). Following the exclusion of HD, this phenotype was labeled Huntington disease-like 1 (HDL1). Here, we provide an update on the Swedish 8-OPRI family, describe the clinical features of one of its affected members with video-recordings, compare the four 8-OPRI families and study the effect of PRNP polymorphic codon 129 and gender on phenotype. Surprisingly, the Swedish kindred displayed the longest survival of all of the 8-OPRI families with a mean of 15.1 years from onset of symptoms. Subjects with PRNP polymorphic codon 129M in the mutated allele had significantly earlier age of onset, longer survival and earlier age of death than 129V subjects. Homozygous 129MM had earlier age of onset than 129VV. Females had a significantly earlier age of onset and earlier age of death than males. Up to 50% of variability in age of onset was conferred by the combined effect of PRNP polymorphic codon 129 and gender. An inverse correlation between early age of onset and long survival was found for this mutation.

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