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A form of CMT1, with a variable clinical presentation that can range from severe impairment with onset in childhood to mild impairment appearing during adulthood. CMT1F is characterized by a progressive peripheral motor and sensory neuropathy with distal paresis in the lower limbs that varies from mild weakness to complete paralysis of the distal muscle groups, absent tendon reflexes and reduced nerve conduction. CMT1F represents the ''demyelinating'' form of CMT2E and is caused by mutations in the NEFL gene (8p21.2)..
Features include always present findings: Myelin outfoldings, Distal amyotrophy, Onion bulb formation, and Segmental peripheral demyelination/remyelination; and very common findings: Distal muscle weakness, Distal sensory impairment, Decreased nerve conduction velocity, and Skeletal muscle atrophy and others. 62 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 20 | Hyporeflexia, Difficulty swallowing (dysphagia), Global developmental delay |
NEFL encodes neurofilament light chain (543 aa). Neurofilaments usually contain three intermediate filament proteins: NEFL, NEFM, and NEFH which are involved in the maintenance of neuronal caliber. Highest expression in Brain Frontal Cortex BA9 (487.2 TPM) and Brain Cortex (328.6 TPM).
Charcot-Marie-Tooth disease type 1F is associated with mutations in the NEFL gene on chromosome 8.
The NEFL protein participates in Transcription of NOTCH2NLB gene, GRIN1:GRIN2B NMDA receptors:DLG4:DLG1,DLG2,DLG3,DLG4:NEFL, and GRIN1:GRIN2 NMDA receptors:DLG4:DLG1,DLG2,DLG3,DLG4:NEFL pathways.
NEFL is classified as a druggable target with score 0.0.
Genetic testing for NEFL is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Charcot-Marie-Tooth disease type 1F has been reported in the published literature.
Phenotype severity distribution: 4 always present features, 8 very common features, 25 common features.
Estimated prevalence: Unknown (Unknown prevalence).
1 clinical trial registered, 1 recruiting. Interventions under study include other interventions. Research is primarily sponsored by academic and government institutions.
5 publications have been identified in PubMed for Charcot-Marie-Tooth disease type 1F. Research spans Diagnostic / Biomarker (40%), Basic Science / Preclinical (40%), and Gene Therapy / Novel Therapeutics (20%).
Dulski J (2026). [PMID: 40873038](https://pubmed.ncbi.nlm.nih.gov/40873038/). *HGG advances*. [Diagnostic / Biomarker]
Abati E (2026). [PMID: 42020662](https://pubmed.ncbi.nlm.nih.gov/42020662/). *Sci Rep*. [Diagnostic / Biomarker]
Rice AD (2025). [PMID: 40833344](https://pubmed.ncbi.nlm.nih.gov/40833344/). *Journal of the peripheral nervous system : JPNS*. [Basic Science / Preclinical]
Beckner RL (2025). [PMID: 41446102](https://pubmed.ncbi.nlm.nih.gov/41446102/). *bioRxiv : the preprint server for biology*. [Basic Science / Preclinical]
Medina J (2024). [PMID: 39008620](https://pubmed.ncbi.nlm.nih.gov/39008620/). *Brain : a journal of neurology*. [Gene Therapy / Novel Therapeutics]
Data assembled from 7 of 12 sources · Last updated Sep 20, 2026, 3:06 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Charcot-Marie-Tooth disease type 1F
Muscles | 15 | Distal muscle weakness, Skeletal muscle atrophy, Foot dorsiflexor weakness |
Arms and legs | 13 | Hand abnormalities (abnormality of the hand), Limb ataxia, Hand tremor |
Bones and joints | 2 | Skeletal muscle atrophy, Sideways curvature of the spine (scoliosis) |
Digestive system | 1 | Difficulty swallowing (dysphagia) |
Kidneys and urinary system | 1 | Urinary incontinence |
Ears | 1 | Inner ear hearing loss (sensorineural hearing impairment) |
Eyes | 1 | Optic nerve hypoplasia |
Head and neck | 1 | Weakness of facial musculature |