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X-linked Charcot-Marie-Tooth disease type 6 is a rare, genetic, principally axonal, peripheral sensorimotor neuropathy characterized by an X-linked dominant inheritance pattern and the childhood-onset of slowly progressive, moderate to severe, distal muscle weakness and atrophy of the lower extremities, as well as distal, panmodal sensory abnormalities, bilateral foot deformities (pes cavus, clawed toes), absent ankle reflexes and gait abnormalities (steppage gait). Females are usually asymptomatic or only present mild manifestations (mild postural hand tremor, mild wasting of hand intrinsic muscles).
Data assembled from 7 of 12 sources · Last updated Sep 20, 2026, 8:43 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Charcot-Marie-Tooth disease X-linked dominant 6
Features include always present findings: Hand muscle weakness and Steppage gait; and common findings: Hand tremor, Intrinsic hand muscle atrophy, Absent Achilles reflex, and Distal lower limb amyotrophy. 12 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Arms and legs | 4 | Hand tremor, Hand muscle weakness, Intrinsic hand muscle atrophy |
Brain and nerves | 3 | Hand tremor, Steppage gait, Peripheral neuropathy |
Muscles | 2 | Hand muscle weakness, Intrinsic hand muscle atrophy |
Ears | 1 | Inner ear hearing loss (sensorineural hearing impairment) |
PDK3 function has not been fully characterized.
Charcot-Marie-Tooth disease X-linked dominant 6 is caused by mutations in the PDK3 gene on chromosome X.
Genetic testing for PDK3 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 2 always present features, 4 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Charcot-Marie-Tooth disease X-linked dominant 6.
5 publications have been identified in PubMed for Charcot-Marie-Tooth disease X-linked dominant 6. Research spans Case Report / Case Series (40%), Epidemiology / Natural History (40%), and Review / Meta-Analysis (20%).
Li J (2025). [PMID: 40200352](https://pubmed.ncbi.nlm.nih.gov/40200352/). *Orphanet journal of rare diseases*. [Epidemiology / Natural History]
Scherrer C (2025). [PMID: 40078221](https://pubmed.ncbi.nlm.nih.gov/40078221/). *J Tissue Eng*. [Review / Meta-Analysis]
Molaei N (2025). [PMID: 41315541](https://pubmed.ncbi.nlm.nih.gov/41315541/). *Sci Rep*. [Epidemiology / Natural History]
Nakamura H (2024). [PMID: 39232641](https://pubmed.ncbi.nlm.nih.gov/39232641/). *BMC neurology*. [Case Report / Case Series]
Wilhelm SDP (2024). [PMID: 39352000](https://pubmed.ncbi.nlm.nih.gov/39352000/). *IUBMB Life*. [Case Report / Case Series]