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Any Joubert syndrome in which the cause of the disease is a mutation in the KIAA0556 gene.
Features include always present findings: Cerebellar vermis hypoplasia and Global developmental delay; and common findings: Cleft palate, Generalized hypotonia, and Cleft lip. 16 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Head and neck | 2 | Cleft palate, Cleft lip |
KATNIP encodes katanin interacting protein (1,618 aa). May influence the stability of microtubules (MT), possibly through interaction with the MT-severing katanin complex Highest expression in Thyroid (35.2 TPM) and Pituitary (22.3 TPM).
Joubert syndrome 26 is associated with mutations in the KATNIP gene on chromosome 16.
KATNIP is classified as a druggable target with score 0.0.
Genetic testing for KATNIP is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Joubert syndrome 26 has been reported in the published literature.
Phenotype severity distribution: 2 always present features, 3 common features.
No clinical trials have been registered for Joubert syndrome 26.
7 publications have been identified in PubMed for Joubert syndrome 26. Research spans Case Report / Case Series (29%), Gene Therapy / Novel Therapeutics (29%), and Diagnostic / Biomarker (14%).
Yang Q (2025). [PMID: 41317100](https://pubmed.ncbi.nlm.nih.gov/41317100/). *Molecular genetics & genomic medicine*. [Gene Therapy / Novel Therapeutics]
Yu M (2025). [PMID: 39940729](https://pubmed.ncbi.nlm.nih.gov/39940729/). *International journal of molecular sciences*. [Review / Meta-Analysis]
D'Abrusco F (2025). [PMID: 39394465](https://pubmed.ncbi.nlm.nih.gov/39394465/). *European journal of human genetics : EJHG*. [Diagnostic / Biomarker]
Wang S (2025). [PMID: 41264249](https://pubmed.ncbi.nlm.nih.gov/41264249/). *Proceedings of the National Academy of Sciences of the United States of America*. [Basic Science / Preclinical]
Kiraz A (2025). [PMID: 40448720](https://pubmed.ncbi.nlm.nih.gov/40448720/). *Neurogenetics*. [Case Report / Case Series]
Data assembled from 5 of 12 sources · Last updated Sep 20, 2026, 4:48 AM UTC
Online Mendelian Inheritance in Man
Genetic and Rare Diseases Info Center
Common questions about Joubert syndrome 26
2 |
Short stature, Decreased response to growth hormone stimulation test |
Hormones | 2 | Central hypothyroidism, Decreased response to growth hormone stimulation test |
Eyes | 2 | Nystagmus, Ptosis |
Brain and nerves | 1 | Global developmental delay |
Muscles | 1 | Generalized hypotonia |
Lungs and breathing | 1 | Recurrent upper respiratory tract infections |
Blood and immune system | 1 | Recurrent upper respiratory tract infections |
Bhate M (2025). [PMID: 40190368](https://pubmed.ncbi.nlm.nih.gov/40190368/). *Neuro-ophthalmology (Aeolus Press)*. [Case Report / Case Series]
Xiang J (2024). [PMID: 39097279](https://pubmed.ncbi.nlm.nih.gov/39097279/). *Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics*. [Gene Therapy / Novel Therapeutics]