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Updated: May 10, 2026
07:43
Modeling Charcot-Marie-Tooth Disease In Vitro by Transfecting Mouse Primary Motoneurons
Published on: January 7, 2019
SET binding factor 1 (SBF1) mutation causes Charcot-Marie-Tooth disease type 4B3.
Khriezhanuo Nakhro1, Jin-Mo Park, Young Bin Hong
1Department of Biological Science, Kongju National University, Gongju, Korea.
Neurology
|June 11, 2013
Summary
Genetic mutations in the SBF1 gene cause a new form of Charcot-Marie-Tooth disease type 4B (CMT4B3). This discovery aids in understanding CMT disease mechanisms and developing molecular diagnostics.
Area of Science:
- Genetics
- Neurology
- Molecular Biology
Background:
- Charcot-Marie-Tooth disease (CMT) is a group of inherited peripheral neuropathies.
- Autosomal recessive demyelinating CMT type 4B (CMT4B) is a severe subtype characterized by specific pathological features.
- Identifying the genetic basis of CMT subtypes is crucial for diagnosis and treatment.
Purpose of the Study:
- To determine the genetic cause of an autosomal recessive demyelinating Charcot-Marie-Tooth disease type 4B (CMT4B) in a Korean family.
- To characterize the clinical and pathological features of this CMT4B family.
Main Methods:
- Whole exome sequencing was performed on affected and unaffected individuals from a 14-member Korean family.
- Distal sural nerve biopsies were obtained from affected participants for pathological analysis.
- Genetic analysis focused on identifying mutations in candidate genes associated with demyelinating neuropathies.
Main Results:
- Compound heterozygous missense mutations in the SET binding factor 1 (SBF1) gene, also known as MTMR5, were identified as the cause of CMT4B in this family.
- Affected individuals presented with phenotypes similar to CMT4B1 and CMT4B2, including loss of large myelinated fibers and focally folded myelin sheaths.
- Distinct differences in the number of myelinated fibers were observed compared to CMT4B1 and CMT4B2.
Conclusions:
- Compound heterozygous mutations in SBF1 define a novel subtype of CMT4B, designated as CMT4B3.
- This finding highlights the role of SBF1 in peripheral nerve myelination and CMT pathogenesis.
- The identification of SBF1 mutations facilitates the development of molecular diagnostics and future mechanistic studies for CMT disease.
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