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PLoS Genet. 2016 Feb 1;12(2):e1005829. doi: 10.1371/journal.pgen.1005829. eCollection 2016 Feb.

A Mutation in PMP2 Causes Dominant Demyelinating Charcot-Marie-Tooth Neuropathy.

Author information

1
Stem Cell and Regenerative Medicine Center, Samsung Medical Center, Seoul, Korea.
2
Department of Health Sciences and Technology, Samsung Advanced Institute for Health Science and Technology, Sungkyunkwan University, Seoul, Korea.
3
Department of Biological Science, Kongju National University, Gongju, Korea.
4
Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5
Neuroscience Center, Samsung Medical Center, Seoul, Korea.
6
Department of Radiology, Ewha Womans University, School of Medicine, Seoul, Korea.
7
Department of Pathology, Ewha Womans University, School of Medicine, Seoul, Korea.
8
Department of Physiology, College of Medicine, Dong-A University, Busan, Korea.

Abstract

Charcot-Marie-Tooth disease (CMT) is a heterogeneous group of peripheral neuropathies with diverse genetic causes. In this study, we identified p.I43N mutation in PMP2 from a family exhibiting autosomal dominant demyelinating CMT neuropathy by whole exome sequencing and characterized the clinical features. The age at onset was the first to second decades and muscle atrophy started in the distal portion of the leg. Predominant fatty replacement in the anterior and lateral compartment was similar to that in CMT1A caused by PMP22 duplication. Sural nerve biopsy showed onion bulbs and degenerating fibers with various myelin abnormalities. The relevance of PMP2 mutation as a genetic cause of dominant CMT1 was assessed using transgenic mouse models. Transgenic mice expressing wild type or mutant (p.I43N) PMP2 exhibited abnormal motor function. Electrophysiological data revealed that both mice had reduced motor nerve conduction velocities (MNCV). Electron microscopy revealed that demyelinating fibers and internodal lengths were shortened in both transgenic mice. These data imply that overexpression of wild type as well as mutant PMP2 also causes the CMT1 phenotype, which has been documented in the PMP22. This report might expand the genetic and clinical features of CMT and a further mechanism study will enhance our understanding of PMP2-associated peripheral neuropathy.

PMID:
26828946
PMCID:
PMC4735456
DOI:
10.1371/journal.pgen.1005829
[Indexed for MEDLINE]
Free PMC Article

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