Cited by 203Genetic Neurodegenerative DiseasesAmyotrophic Lateral Sclerosis ResearchHereditary Neurological Disorders

C9orf72 expansions are the most common genetic cause of Huntington disease phenocopies

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Hensman Moss, Davina J., Poulter, Mark, Beck, Jon, Hehir, Jason, Polke, James M., Campbell, Tracy, Adamson, Garry, Mudanohwo, Ese +7 more·2014·Neurology

Abstract

OBJECTIVE: In many cases where Huntington disease (HD) is suspected, the genetic test for HD is negative: these are known as HD phenocopies. A repeat expansion in the C9orf72 gene has recently been identified as a major cause of familial and sporadic frontotemporal lobar degeneration and amyotrophic lateral sclerosis. Our objective was to determine whether this mutation causes HD phenocopies. METHODS: A cohort of 514 HD phenocopy patients were analyzed for the C9orf72 expansion using repeat primed PCR. In cases where the expansion was found, Southern hybridization was performed to determine expansion size. Clinical case notes were reviewed to determine the phenotype of expansion-positive cases. RESULTS: Ten subjects (1.95%) had the expansion, making it the most common identified genetic cause of HD phenocopy presentations. The size of expansion was not significantly different from that associated with other clinical presentations of C9orf72 expanded cases. The C9orf72 expansion-positive subjects were characterized by the presence of movement disorders, including dystonia, chorea, myoclonus, tremor, and rigidity. Furthermore, the age at onset in this cohort was lower than previously reported for subjects with the C9orf72 expansion and included one case with pediatric onset. DISCUSSION: This study extends the known phenotype of the C9orf72 expansion in both age at onset and movement disorder symptoms. We propose a revised clinico-genetic algorithm for the investigation of HD phenocopy patients based on these data.

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  • C9orf72 expansion mutations are associated with ALS/FTLD and also with symptoms reminiscent of Parkinson disease, Alzheimer disease, Huntington disease, and corticobasal syndrome.

    “For instance, C9orf72 expansion mutations are associated not only with ALS/FTLD, but also with symptoms reminiscent of Parkinson disease, Alzheimer disease, Huntington disease, and corticobasal syndrome, reinforcing the imperfect connection between clinical and molecular phenotypes and emphasizing the need for molecular diagnostics [155–164].”

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  1. Wild EJ, Mudanohwo EE, Sweeney MG, et al. Hunting- ton's disease phenocopies are clinically and genetically het- erogeneous. Mov Disord 2008;23:716-720.

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Authors
Hensman Moss, D. J., Poulter, M., Beck, J., Hehir, J., Polke, J. M., Campbell, T., Adamson, G., Mudanohwo, E., McColgan, P., Haworth, A., Wild, E. J., Sweeney, M. G., Houlden, H., Mead, S., & Tabrizi, S. J.
Affiliations
  • From the Departments of Neurodegenerative Disease (D.J.H.M., P.M., E.J.W., S.M., S.J.T.) and Molecular Neuroscience (H.H.), UCL Institute of Neurology, London; MRC Prion Unit (M.P., J.B., T.C., G.A.), London; and Neurogenetics Unit (J.H., J.M.P., E.M., A.H., M.G.S., H.H.), National Hospital for Neurology and Neurosurgery, University College London Hospitals, UK.
  • MRC Prion Unit (GB)
Venue
Neurology
Published
2014-01-28
Volume
82
Issue
4
Pages
292-299
ISSN
  • 0028-3878 (ISSN-L)
  • 1526-632X
OpenAlex
W2159280728
Cited by
203
References
37
Citations by year
2026: 5 · 2025: 8 · 2024: 12 · 2023: 9 · 2022: 13 · 2021: 13 · 2020: 19 · 2019: 10 · 2018: 27 · 2017: 16 · 2016: 29 · 2015: 23 · 2014: 17 · 2013: 1
FWCI
11.45
Type
journal article
Language
en
Open access
Locations
  • Neurology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • CHDI Foundation
  • National Institute for Health and Care Research (ACF-2009-18-016, CL-2009-18-005)
  • Academy of Medical Sciences (AMS-SGCL6-Wild)
  • University College London
  • University College London Hospitals NHS Foundation Trust
  • Medical Research Council (MR/J004758/1, MR/L02053X/1, EU FP7)
  • Biotechnology and Biological Sciences Research Council
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
Keywords
C9orf72, repeat expansion, genetic testing, movement disorders, dystonia, chorea, myoclonus, tremor, rigidity, age of onset, pediatric onset, frontotemporal lobar degeneration, amyotrophic lateral sclerosis
MeSH terms
C9orf72 Protein, Adolescent, Adult, Child, Cognition Disorders, DNA Mutational Analysis, Female, Humans, Huntington Disease, Magnetic Resonance Imaging, Male, Mental Status Schedule, Middle Aged, Phenotype, Proteins, Severity of Illness Index, Cohort Studies, Age of Onset, DNA Repeat Expansion, Young Adult

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