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Features include always present findings: Absent septum pellucidum, Gaze-evoked nystagmus, Ataxia, and Myoclonic seizure and others; and very common findings: Attenuation of retinal blood vessels, High myopia, Retinal detachment, and Occipital encephalocele and others. 66 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Eyes | 15 | Lens subluxation, Gaze-evoked nystagmus, Nystagmus |
COL18A1 function has not been fully characterized.
Knobloch syndrome 1 is caused by mutations in the COL18A1 gene on chromosome 21.
Genetic testing for COL18A1 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Knobloch syndrome 1 has been reported in the published literature.
Phenotype severity distribution: 19 always present features, 7 very common features, 15 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Knobloch syndrome 1.
128 publications have been identified in PubMed for Knobloch syndrome 1. Research spans Review / Meta-Analysis (60%), Basic Science / Preclinical (17%), and Case Report / Case Series (9%).
Research Type | Count | % of Total |
|---|---|---|
Research summaries | 77 | 60% |
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 6:54 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Knobloch syndrome 1
Brain and nerves |
9 |
Seizure, Ataxia, Myoclonic seizure |
Muscles | 4 | Peripapillary atrophy, Shrinkage of the cerebellum (cerebellar atrophy), Chorioretinal atrophy |
Head and neck | 2 | Microcephaly, Narrow face |
Bones and joints | 1 | Joint hypermobility |
Kidneys and urinary system | 1 | Renal duplication |
Skin | 1 | Alopecia of scalp |
Age of onset: at birth.
22 |
17% |
Patient case studies | 12 | 9% |
Disease patterns and progression | 9 | 7% |
Testing and diagnosis research | 4 | 3% |
Other research | 2 | 2% |
Clinical study results | 2 | 2% |
Asadollahzadeh E (2026). [PMID: 41767075](https://pubmed.ncbi.nlm.nih.gov/41767075/). *Clin Case Rep*. [Case Report / Case Series]
Lee S (2026). [PMID: 41206258](https://pubmed.ncbi.nlm.nih.gov/41206258/). *Am J Geriatr Psychiatry*. [Review / Meta-Analysis]
Amado C (2026). [PMID: 40975490](https://pubmed.ncbi.nlm.nih.gov/40975490/). *Ann Allergy Asthma Immunol*. [Review / Meta-Analysis]
Ferri C (2026). [PMID: 41798958](https://pubmed.ncbi.nlm.nih.gov/41798958/). *Front Immunol*. [Review / Meta-Analysis]
Anderson EN (2026). [PMID: 41468891](https://pubmed.ncbi.nlm.nih.gov/41468891/). *Am J Hum Genet*. [Basic Science / Preclinical]
Papazachariou A (2026). [PMID: 41128447](https://pubmed.ncbi.nlm.nih.gov/41128447/). *Curr Opin Clin Nutr Metab Care*. [Review / Meta-Analysis]
Mak CCY (2025). [PMID: 40280028](https://pubmed.ncbi.nlm.nih.gov/40280028/). *EBioMedicine*. [Diagnostic / Biomarker]
Carmant LS (2025). [PMID: 40524352](https://pubmed.ncbi.nlm.nih.gov/40524352/). *Prenat Diagn*. [Case Report / Case Series]
Gao X (2025). [PMID: 41645371](https://pubmed.ncbi.nlm.nih.gov/41645371/). *Zhonghua Yi Xue Yi Chuan Xue Za Zhi*. [Case Report / Case Series]
Abdullah OO (2025). [PMID: 40013507](https://pubmed.ncbi.nlm.nih.gov/40013507/). *Turk J Ophthalmol*. [Case Report / Case Series]