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Clin Genet. 2018 Jan;93(1):119-125. doi: 10.1111/cge.13095.

Genotype-phenotype study in patients with valosin-containing protein mutations associated with multisystem proteinopathy.

Author information

1
Division of Genetics and Genomic Medicine, Department of Pediatrics, University of California, Irvine, Orange, California.
2
Neuromuscular Program, Department of Neurology, University of California, Irvine, Orange, California.
3
Department of Neurology, Technische Universit├Ąt Dresden, and German Center for Neurodegenerative Diseases (DZNE), Research Side Dresden, 01307 Dresden, Germany.
4
Deschutes Osteoporosis Center, Bend, Oregon.
5
Department of Neurology, University of Kentucky Medical School, Lexington, Kentucky.

Abstract

Mutations in valosin-containing protein (VCP), an ATPase involved in protein degradation and autophagy, cause VCP disease, a progressive autosomal dominant adult onset multisystem proteinopathy. The goal of this study is to examine if phenotypic differences in this disorder could be explained by the specific gene mutations. We therefore studied 231 individuals (118 males and 113 females) from 36 families carrying 15 different VCP mutations. We analyzed the correlation between the different mutations and prevalence, age of onset and severity of myopathy, Paget's disease of bone (PDB), and frontotemporal dementia (FTD), and other comorbidities. Myopathy, PDB and FTD was present in 90%, 42% and 30% of the patients, respectively, beginning at an average age of 43, 41, and 56 years, respectively. Approximately 9% of patients with VCP mutations had an amyotrophic lateral sclerosis (ALS) phenotype, 4% had been diagnosed with Parkinson's disease (PD), and 2% had been diagnosed with Alzheimer's disease (AD). Large interfamilial and intrafamilial variation made establishing correlations difficult. We did not find a correlation between the mutation type and the incidence of any of the clinical features associated with VCP disease, except for the absence of PDB with the R159C mutation in our cohort and R159C having a later age of onset of myopathy compared with other molecular subtypes.

KEYWORDS:

VCP; IBMPFD; genotype-phenotype; multisystem proteinopathy (MSP); valosin-containing protein

PMID:
28692196
PMCID:
PMC5739971
[Available on 2019-01-01]
DOI:
10.1111/cge.13095
[Indexed for MEDLINE]
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