developmental and epileptic encephalopathy, 1
Findings
No curated finding names developmental and epileptic encephalopathy, 1 yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Any early infantile epileptic encephalopathy in which the cause of the disease is a mutation in the ARX gene.
Definition from the Mondo Disease Ontology (MONDO:0010632), read 2026-09-29. CC BY 4.0.
- Inheritance
- X-linked recessive inheritance
- Onset and course
- Congenital onset · Neonatal onset
HPO, annotations 2026-09-02
Features
22 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Delayed CNS myelinationHPOHP:0002188
- 1 of 1 reported patient
- EEG with burst suppressionHPOHP:0010851
- 4 of 4 reported patients
- Epileptic encephalopathyHPOHP:0200134
- 2 of 2 reported patients
- 2 of 2 reported patients · Neonatal onset
- Focal-onset seizureHPOHP:0007359
- 2 of 2 reported patients
- Global brain atrophyHPOHP:0002283
- 2 of 2 reported patients
- Global developmental delayHPOHP:0001263
- 3 of 3 reported patients
- Hypertonia
Show the remaining 10
- Poor head controlHPOHP:0002421
- 1 of 1 reported patient
- Reduced eye contactHPOHP:0000817
- 1 of 1 reported patient
- Severe global developmental delayHPOHP:0011344
- 2 of 2 reported patients
- Tonic seizureHPOHP:0032792
- 2 of 2 reported patients · Neonatal onset
- Abnormal pyramidal signHPOHP:0007256
- 1 of 2 reported patients
- Erratic myoclonusHPOHP:0025357
- 1 of 2 reported patients
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- ARXHGNC:18060
- Strong · PanelApp Australia · X-linked · 2025
Where it sits
Other names
7 names
Resolves to: developmental and epileptic encephalopathy, 1
- Also called
- ARX early infantile epileptic encephalopathyDEE1developmental and epileptic encephalopathy 1, X-linked recessiveearly infantile epileptic encephalopathy caused by mutation in ARXEIEE1epileptic encephalopathy, early infantile, 1epileptic encephalopathy, early infantile, type 1