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SeSAME syndrome is characterized by seizures, sensorineural deafness, ataxia, intellectual deficit, and electrolyte imbalance (hypokalemia, metabolic alkalosis, and hypomagnesemia).
Features include always present findings: Renal sodium wasting, Ataxia, Hypomagnesemia, and Elevated serum bicarbonate concentration and others; and very common findings: Increased circulating renin concentration, Hypokalemia, Generalized-onset seizure, and Renal magnesium wasting and others. 39 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 13 | Seizure, Ataxia, Intention tremor |
Muscles | 8 | Shrinkage of the cerebellum (cerebellar atrophy), Renal sodium wasting, Low muscle tone (hypotonia) |
Kidneys and urinary system | 5 | Renal sodium wasting, Renal potassium wasting, Renal salt wasting |
Lab test results | 3 | Increased circulating aldosterone concentration, Elevated serum bicarbonate concentration, Increased circulating renin concentration |
Metabolism | 2 | Hypokalemic metabolic alkalosis, Metabolic alkalosis |
Growth and development | 1 | Short stature |
Ears | 1 | Inner ear hearing loss (sensorineural hearing impairment) |
Heart and blood vessels | 1 | Hypertension |
Arms and legs | 1 | Lower limb muscle weakness |
KCNJ10 encodes potassium inwardly rectifying channel subfamily J member 10 (379 aa). May be responsible for potassium buffering action of glial cells in the brain. Highest expression in Brain Spinal cord cervical c-1 (132.0 TPM) and Brain Caudate basal ganglia (61.6 TPM).
EAST syndrome is caused by mutations in the KCNJ10 gene on chromosome 1.
KCNJ10 is classified as a druggable target (Druggable Genome, Ion Channel, and Transporter categories) with score 7.5.
Genetic testing for KCNJ10 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 9 always present features, 6 very common features, 4 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
1 clinical trial registered, 1 recruiting. Interventions under study include other interventions. Research is primarily sponsored by academic and government institutions.
5 publications have been identified in PubMed for EAST syndrome. Research spans Case Report / Case Series (80%) and Basic Science / Preclinical (20%).
Shakeri S (2026). [PMID: 41724667](https://pubmed.ncbi.nlm.nih.gov/41724667/). *Mol Genet Genomic Med*. [Case Report / Case Series]
Fraiman P (2026). [PMID: 40461099](https://pubmed.ncbi.nlm.nih.gov/40461099/). *Pract Neurol*. [Case Report / Case Series]
Gao ZX (2026). [PMID: 41979005](https://pubmed.ncbi.nlm.nih.gov/41979005/). *Acta Physiol (Oxf)*. [Basic Science / Preclinical]
Yari A (2025). [PMID: 39607615](https://pubmed.ncbi.nlm.nih.gov/39607615/). *Neurol Sci*. [Case Report / Case Series]
Vats A (2024). [PMID: 39381482](https://pubmed.ncbi.nlm.nih.gov/39381482/). *Cureus*. [Case Report / Case Series]
Data assembled from 8 of 12 sources · Last updated Sep 19, 2026, 1:55 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about EAST syndrome