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Features include always present findings: Happy demeanor, Severe intellectual disability, Hypoplasia of the pons, and Motor stereotypy and others; and common findings: Strabismus, Bulbous nose, Hypoplasia of the corpus callosum, and Autistic behavior and others. 39 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 15 | Inability to walk, Seizure, Ataxia |
TBC1D23 function has not been fully characterized.
Pontocerebellar hypoplasia, type 11 is associated with mutations in the TBC1D23 gene on chromosome 3.
Genetic testing for TBC1D23 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 8 always present features, 5 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for pontocerebellar hypoplasia, type 11.
9 publications have been identified in PubMed for pontocerebellar hypoplasia, type 11. Research spans Case Report / Case Series (44%), Other (11%), and Review / Meta-Analysis (11%).
Peker A (2026). [PMID: 42115434](https://pubmed.ncbi.nlm.nih.gov/42115434/). *Cerebellum*. [Case Report / Case Series]
Altıntaş M (2026). [PMID: 41979712](https://pubmed.ncbi.nlm.nih.gov/41979712/). *Cerebellum*. [Review / Meta-Analysis]
Drobňaková S (2026). [PMID: 42195294](https://pubmed.ncbi.nlm.nih.gov/42195294/). *Life (Basel)*. [Epidemiology / Natural History]
Liu K (2025). [PMID: 40581672](https://pubmed.ncbi.nlm.nih.gov/40581672/). *Hum Genomics*. [Gene Therapy / Novel Therapeutics]
Al-Maraghi A (2025). [PMID: 40508022](https://pubmed.ncbi.nlm.nih.gov/40508022/). *Int J Mol Sci*. [Case Report / Case Series]
Akter H (2025). [PMID: 40671880](https://pubmed.ncbi.nlm.nih.gov/40671880/). *Genet Med Open*. [Other]
Data assembled from 6 of 12 sources · Last updated Sep 19, 2026, 9:41 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Muscles |
2 |
Generalized hypotonia, Skeletal muscle atrophy |
Eyes | 1 | Strabismus |
Growth and development | 1 | Short stature |
Bones and joints | 1 | Skeletal muscle atrophy |
Digestive system | 1 | Difficulty swallowing (dysphagia) |
Head and neck | 1 | Microcephaly |
Arms and legs | 1 | Limb ataxia |
Lungs and breathing | 1 | Recurrent respiratory infections |
Blood and immune system | 1 | Recurrent respiratory infections |
Mercan M (2025). [PMID: 40085521](https://pubmed.ncbi.nlm.nih.gov/40085521/). *Amyotroph Lateral Scler Frontotemporal Degener*. [Case Report / Case Series]
Alayoubi AM (2024). [PMID: 39455833](https://pubmed.ncbi.nlm.nih.gov/39455833/). *Sci Rep*. [Case Report / Case Series]
Cavestro C (2024). [PMID: 38750253](https://pubmed.ncbi.nlm.nih.gov/38750253/). *Ann Clin Transl Neurol*. [Basic Science / Preclinical]