Niemann-pick C disease gene mutations and age-related neurodegenerative disorders

Michael Zech, Georg Nübling, Florian Castrop, Angela Jochim, Eva C. Schulte, Brit Mollenhauer, Peter Lichtner, Annette Peters, Christian Gieger, Thorsten Marquardt, Marie T. Vanier, Philippe Latour, Hans Klünemann, Claudia Trenkwalder, Janine Diehl-Schmid, Robert Perneczky, Thomas Meitinger, Konrad Oexle, Bernhard Haslinger, Stefan LorenzlJuliane Winkelmann

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46 Scopus citations

Abstract

Niemann-Pick type C (NPC) disease is a rare autosomal-recessively inherited lysosomal storage disorder caused by mutations in NPC1 (95%) or NPC2. Given the highly variable phenotype, diagnosis is challenging and particularly late-onset forms with predominantly neuropsychiatric presentations are likely underdiagnosed. Pathophysiologically, genetic alterations compromising the endosomal/lysosomal system are linked with age-related neurodegenerative disorders. We sought to examine a possible association of rare sequence variants in NPC1 and NPC2 with Parkinson's disease (PD), frontotemporal lobar degeneration (FTLD) and progressive supranuclear palsy (PSP), and to genetically determine the proportion of potentially misdiagnosed NPC patients in these neurodegenerative conditions. By means of high-resolution melting, we screened the coding regions of NPC1 and NPC2 for rare genetic variation in a homogenous German sample of patients clinically diagnosed with PD (n = 563), FTLD (n = 133) and PSP (n = 94), and 846 population-based controls. The frequencies of rare sequence variants in NPC1/ 2 did not differ significantly between patients and controls. Disease-associated NPC1/2 mutations were found in six PD patients (1.1%) and seven control subjects (0.8%), but not in FTLD or PSP. All rare variation was detected in the heterozygous state and no compound heterozygotes were observed. Our data do not support the hypothesis that rare NPC1/2 variants confer susceptibility for PD, FTLD, or PSP in the German population. Misdiagnosed NPC patients were not present in our samples. However, further assessment of NPC disease genes in age-related neurodegeneration is warranted.

Original languageEnglish
Article numbere82879
JournalPLoS ONE
Volume8
Issue number12
DOIs
StatePublished - 30 Dec 2013

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