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Any Zimmermann-Laband syndrome in which the cause of the disease is a mutation in the KCNH1 gene.
Features include always present findings: Seizure and Severe intellectual disability; and very common findings: Low muscle tone (hypotonia) and Gingival overgrowth. 53 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Head and neck | 4 | Coarse facial features, High palate, Macrocephaly |
KCNH1 encodes potassium voltage-gated channel subfamily H member 1 (989 aa). Pore-forming (alpha) subunit of a voltage-gated delayed rectifier potassium channel that mediates outward-rectifying potassium currents which, on depolarization, reaches a steady-state level and do not inactivate. Highest expression in Brain Cerebellar Hemisphere (6.4 TPM) and Brain Cerebellum (6.0 TPM).
Zimmermann-Laband syndrome 1 is associated with mutations in the KCNH1 gene on chromosome 1.
KCNH1 is classified as a druggable target (Druggable Genome, Ion Channel, and Transporter categories) with score 0.2.
Genetic testing for KCNH1 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 2 always present features, 2 very common features, 13 common features.
No clinical trials have been registered for Zimmermann-Laband syndrome 1.
10 publications have been identified in PubMed for Zimmermann-Laband syndrome 1. Research spans Case Report / Case Series (50%), Basic Science / Preclinical (30%), and Review / Meta-Analysis (20%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 5 | 50% |
Data assembled from 5 of 12 sources · Last updated Sep 19, 2026, 9:40 PM UTC
Online Mendelian Inheritance in Man
Genetic and Rare Diseases Info Center
Common questions about Zimmermann-Laband syndrome 1
Brain and nerves
3 |
Seizure, Intellectual disability, Severe intellectual disability |
Digestive system | 3 | Gastroesophageal reflux, Enlarged liver (hepatomegaly), Enlarged spleen (splenomegaly) |
Eyes | 3 | Cataract, Oculomotor apraxia, Horizontal nystagmus |
Heart and blood vessels | 3 | Aortic root aneurysm, Aortic arch aneurysm, Heart muscle disease (cardiomyopathy) |
Arms and legs | 3 | Hyperextensibility of the finger joints, Short distal phalanx of toe, Short distal phalanx of finger |
Bones and joints | 2 | Hyperextensibility of the finger joints, Sideways curvature of the spine (scoliosis) |
Ears | 1 | Hearing loss (hearing impairment) |
Muscles | 1 | Low muscle tone (hypotonia) |
Skin | 1 | Small nail |
Growth and development | 1 | Growth abnormality |
Blood and immune system | 1 | Enlarged spleen (splenomegaly) |
Kidneys and urinary system | 1 | Nephrolithiasis |
3 |
30% |
Research summaries | 2 | 20% |
Bernert A (2026). [PMID: 41656275](https://pubmed.ncbi.nlm.nih.gov/41656275/). *Molecular brain*. [Basic Science / Preclinical]
Sundman AK (2026). [PMID: 40986435](https://pubmed.ncbi.nlm.nih.gov/40986435/). *Brain : a journal of neurology*. [Review / Meta-Analysis]
Davenport M (2025). [PMID: 40519534](https://pubmed.ncbi.nlm.nih.gov/40519534/). *World journal of pediatric surgery*. [Review / Meta-Analysis]
Do NM (2025). [PMID: 40604848](https://pubmed.ncbi.nlm.nih.gov/40604848/). *BMC oral health*. [Case Report / Case Series]
Ismail H (2025). [PMID: 40425216](https://pubmed.ncbi.nlm.nih.gov/40425216/). *BMJ case reports*. [Case Report / Case Series]
Sechi S (2025). [PMID: 41040851](https://pubmed.ncbi.nlm.nih.gov/41040851/). *Brain communications*. [Basic Science / Preclinical]
Esener Z (2025). [PMID: 40358131](https://pubmed.ncbi.nlm.nih.gov/40358131/). *American journal of medical genetics. Part A*. [Case Report / Case Series]
Chen D (2024). [PMID: 38372889](https://pubmed.ncbi.nlm.nih.gov/38372889/). *Human cell*. [Basic Science / Preclinical]
Gu Y (2024). [PMID: 39087232](https://pubmed.ncbi.nlm.nih.gov/39087232/). *The Journal of clinical pediatric dentistry*. [Case Report / Case Series]
Carpentieri G (2024). [PMID: 39210597](https://pubmed.ncbi.nlm.nih.gov/39210597/). *HGG advances*. [Case Report / Case Series]