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An autosomal recessive multisystem disorder characterized by neurologic, gastrointestinal, and secretory dysfunction. Affected individuals present at birth with hypotonia, feeding difficulties, mild dysmorphic features, and sensorineural hearing loss. They show poor overall growth associated with gastrointestinal anomalies such as gastroesophageal reflux or midgut malrotation, as well as profound global developmental delay with inability to sit or speak. Tear, sweat, and saliva production is also impaired, causing dry mouth and recurrent bronchial mucus plugging. Some of the clinical features are reminiscent of cystic fibrosis.
Features include always present findings: Narrow forehead, Midgut malrotation, Increased CSF albumin concentration, and Gastroesophageal reflux and others.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Digestive system | 4 | Gastroesophageal reflux, Chronic constipation, Feeding difficulties |
SLC12A2 function has not been fully characterized.
Kilquist syndrome is associated with mutations in the SLC12A2 gene on chromosome 5.
Genetic testing for SLC12A2 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 25 always present features.
No clinical trials have been registered for Kilquist syndrome.
3 publications have been identified in PubMed for Kilquist syndrome. Research spans Case Report / Case Series (67%) and Basic Science / Preclinical (33%).
Mutai H (2025). [PMID: 40295800](https://pubmed.ncbi.nlm.nih.gov/40295800/). *Sci Rep*. [Basic Science / Preclinical]
Leone P (2025). [PMID: 40678848](https://pubmed.ncbi.nlm.nih.gov/40678848/). *Am J Med Genet A*. [Case Report / Case Series]
Ludin K (2025). [PMID: 40503591](https://pubmed.ncbi.nlm.nih.gov/40503591/). *Am J Med Genet A*. [Case Report / Case Series]
Data assembled from 6 of 12 sources · Last updated Sep 18, 2026, 3:18 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Common questions about Kilquist syndrome
4 |
Severe intellectual disability, Overactive reflexes (hyperreflexia), Absent speech |
Lab test results | 1 | Increased CSF albumin concentration |
Muscles | 1 | Generalized hypotonia |
Ears | 1 | Bilateral sensorineural hearing impairment |
Arms and legs | 1 | 2-3 toe syndactyly |
Head and neck | 1 | Mandibular prognathia |
Age of onset: infancy.