Cited by 262Amyotrophic Lateral Sclerosis ResearchHereditary Neurological DisordersAlzheimer's disease research and treatments

Mutations in CHMP2B in Lower Motor Neuron Predominant Amyotrophic Lateral Sclerosis (ALS)

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Cox, Laura E., Ferraiuolo, Laura, Goodall, Emily F., Heath, Paul R., Higginbottom, Adrian, Mortiboys, Heather, Hollinger, Hannah C., Hartley, Judith A. +8 more·2010·PLoS ONE

Abstract

BACKGROUND: Amyotrophic lateral sclerosis (ALS), a common late-onset neurodegenerative disease, is associated with fronto-temporal dementia (FTD) in 3-10% of patients. A mutation in CHMP2B was recently identified in a Danish pedigree with autosomal dominant FTD. Subsequently, two unrelated patients with familial ALS, one of whom also showed features of FTD, were shown to carry missense mutations in CHMP2B. The initial aim of this study was to determine whether mutations in CHMP2B contribute more broadly to ALS pathogenesis. METHODOLOGY/PRINCIPAL FINDINGS: Sequencing of CHMP2B in 433 ALS cases from the North of England identified 4 cases carrying 3 missense mutations, including one novel mutation, p.Thr104Asn, none of which were present in 500 neurologically normal controls. Analysis of clinical and neuropathological data of these 4 cases showed a phenotype consistent with the lower motor neuron predominant (progressive muscular atrophy (PMA)) variant of ALS. Only one had a recognised family history of ALS and none had clinically apparent dementia. Microarray analysis of motor neurons from CHMP2B cases, compared to controls, showed a distinct gene expression signature with significant differential expression predicting disassembly of cell structure; increased calcium concentration in the ER lumen; decrease in the availability of ATP; down-regulation of the classical and p38 MAPK signalling pathways, reduction in autophagy initiation and a global repression of translation. Transfection of mutant CHMP2B into HEK-293 and COS-7 cells resulted in the formation of large cytoplasmic vacuoles, aberrant lysosomal localisation demonstrated by CD63 staining and impairment of autophagy indicated by increased levels of LC3-II protein. These changes were absent in control cells transfected with wild-type CHMP2B. CONCLUSIONS/SIGNIFICANCE: We conclude that in a population drawn from North of England pathogenic CHMP2B mutations are found in approximately 1% of cases of ALS and 10% of those with lower motor neuron predominant ALS. We provide a body of evidence indicating the likely pathogenicity of the reported gene alterations. However, absolute confirmation of pathogenicity requires further evidence, including documentation of familial transmission in ALS pedigrees which might be most fruitfully explored in cases with a LMN predominant phenotype.

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  • Motor neurons from CHMP2B mutant ALS patients show increased calcium concentrations, reduced ATP availability, downregulation of the MAPK/p38 signaling pathway, and impaired autophagy initiation.

    “Motor neurons from CHMP2B mutant ALS patients show increased calcium concentrations, reduced ATP availability, downregulation of the MAPK/p38 signaling pathway and impaired autophagy initiation [266].”
  • Overexpression of CHMP2B mutants leads to the formation of large cytoplasmic vacuoles and increased LC3-II protein levels.

    “overexpression of CHMP2B mutants leads to the formation of large cytoplasmic vacuoles and increased LC3-II protein levels [266]”
  • CHMP2B mutations were subsequently identified in ALS patients with a lower motor neuron predominant syndrome.

    “CHMP2B mutations were subsequently identified in ALS patients with a lower motor neuron predominant syndrome [266,267].”
  • Disease-associated CHMP2B mutations disrupt autophagy.

    “suggesting that disease-associated CHMP2B mutations disrupt autophagy.”

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Authors
Cox, L. E., Ferraiuolo, L., Goodall, E. F., Heath, P. R., Higginbottom, A., Mortiboys, H., Hollinger, H. C., Hartley, J. A., Brockington, A., Burness, C. E., Morrison, K. E., Wharton, S. B., Grierson, A. J., Ince, P. G., Kirby, J., & Shaw, P. J.
Affiliations
  • University of Sheffield (GB)
  • University of Birmingham (GB)
Corresponding author
Shaw, Pamela J.
Venue
PLoS ONE
Published
2010-03-24
Volume
5
Issue
3
Pages
e9872
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2159400623
Cited by
262
References
76
Citations by year
2026: 5 · 2025: 12 · 2024: 9 · 2023: 7 · 2022: 16 · 2021: 11 · 2020: 17 · 2019: 14 · 2018: 13 · 2017: 21 · 2016: 22 · 2015: 23 · 2014: 14 · 2013: 24 · 2012: 33
FWCI
14.70
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (acceptedVersion)
  • ePrints Soton (University of Southampton) (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion, other-oa)
  • Research Portal (Queen's University Belfast) (submittedVersion)
Funders
Wellcome Trust (069388)
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
CHMP2B, amyotrophic lateral sclerosis, progressive muscular atrophy, missense mutations, autophagy dysfunction, MAPK signaling, protein synthesis inhibition, frontotemporal dementia
MeSH terms
Aged, Amyotrophic Lateral Sclerosis, Animals, Brain, Chlorocebus aethiops, DNA Mutational Analysis, England, Female, Humans, Male, Middle Aged, Motor Neurons, Mutation, Nerve Tissue Proteins, Spinal Cord, COS Cells, Neurodegenerative Diseases, Mutation, Missense, Oligonucleotide Array Sequence Analysis, Endosomal Sorting Complexes Required for Transport

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