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Autosomal dominant intermediate Charcot-Marie-Tooth disease type A is a rare hereditary motor and sensory neuropathy characterized by intermediate motor median nerve conduction velocities (usually between 25 and 45 m/s) and signs of both demyelination and axonal degeneration in nerve biopsies. It presents with usual clinical features of Charcot-Marie-Tooth disease (progressive muscle weakness and atrophy of the distal extremities, distal sensory loss, reduced or absent deep tendon reflexes, and feet deformities) in the first to second decade of life with steady progression until the fourth decade, severe progression and stabilization afterwards.
Data assembled from 6 of 12 sources · Last updated Sep 19, 2026, 3:01 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Charcot-Marie-Tooth Disease, axonal, type 2GG
Features include always present findings: Distal amyotrophy; and very common findings: EMG: neuropathic changes and Areflexia. 19 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 5 | Hyporeflexia, EMG: neuropathic changes, Steppage gait |
Muscles | 4 | Muscle spasm, Distal muscle weakness, Thenar muscle atrophy |
Arms and legs | 1 | Foot dorsiflexor weakness |
GBF1 encodes golgi brefeldin A resistant guanine nucleotide exchange factor 1 (1,860 aa). Guanine-nucleotide exchange factor (GEF) for members of the Arf family of small GTPases involved in trafficking in the early secretory pathway; its GEF activity initiates the coating of nascent vesicles via the localized generation of activated ARFs through replacement of GDP with GTP. Highest expression in Pituitary (70.4 TPM) and Brain Cerebellum (66.7 TPM).
Charcot-Marie-Tooth Disease, axonal, type 2GG is associated with mutations in the GBF1 gene on chromosome 10.
The GBF1 protein participates in GBF1 recruits ARF:GDP to the Golgi, GBF1 recruits ARF:GDP to the ERGIC, and RAB1:GTP recruits GBF1 to the ERGIC pathways.
GBF1 is classified as a druggable target (G Protein Coupled Receptor category) with score 0.0.
Genetic testing for GBF1 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 1 always present feature, 2 very common features, 4 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Charcot-Marie-Tooth Disease, axonal, type 2GG.
11 publications have been identified in PubMed for Charcot-Marie-Tooth Disease, axonal, type 2GG. Research spans Basic Science / Preclinical (45%), Case Report / Case Series (36%), and Review / Meta-Analysis (9%).
Research Type | Count | % of Total |
|---|---|---|
Laboratory research | 5 | 45% |
Patient case studies | 4 | 36% |
Research summaries | 1 | 9% |
Disease patterns and progression | 1 | 9% |
Pérez-López DO (2025). [PMID: 40635134](https://pubmed.ncbi.nlm.nih.gov/40635134/). *Human molecular genetics*. [Basic Science / Preclinical]
Pérez-López DO (2025). [PMID: 39975190](https://pubmed.ncbi.nlm.nih.gov/39975190/). *bioRxiv : the preprint server for biology*. [Case Report / Case Series]
Cakar A (2025). [PMID: 39776111](https://pubmed.ncbi.nlm.nih.gov/39776111/). *European journal of neurology*. [Basic Science / Preclinical]
Kavoosi S (2025). [PMID: 41357705](https://pubmed.ncbi.nlm.nih.gov/41357705/). *Iranian journal of public health*. [Basic Science / Preclinical]
Buianova AA (2025). [PMID: 40189573](https://pubmed.ncbi.nlm.nih.gov/40189573/). *Neurological research and practice*. [Case Report / Case Series]
Spontarelli Fruit K (2025). [PMID: 41048924](https://pubmed.ncbi.nlm.nih.gov/41048924/). *Neurology. Genetics*. [Case Report / Case Series]
Maeda M (2025). [PMID: 40047103](https://pubmed.ncbi.nlm.nih.gov/40047103/). *Traffic (Copenhagen, Denmark)*. [Basic Science / Preclinical]
Cabello-Murgui J (2024). [PMID: 39287469](https://pubmed.ncbi.nlm.nih.gov/39287469/). *European journal of neurology*. [Epidemiology / Natural History]
Unknown (2024). [PMID: 38668692](https://pubmed.ncbi.nlm.nih.gov/38668692/). *Human molecular genetics*. [Basic Science / Preclinical]
Ciampana V (2024). [PMID: 39766823](https://pubmed.ncbi.nlm.nih.gov/39766823/). *Genes*. [Case Report / Case Series]