developmental and epileptic encephalopathy, 27
Findings
No curated finding names developmental and epileptic encephalopathy, 27 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 GRIN2B gene.
Definition from the Mondo Disease Ontology (MONDO:0014505), read 2026-09-29. CC BY 4.0.
- Inheritance
- Autosomal dominant inheritance
- Onset and course
- Infantile onset
HPO, annotations 2026-09-02
Features
16 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.
- Absent speechHPOHP:0001344
- 2 of 2 reported patients
- Delayed ability to sitHPOHP:0025336
- 2 of 2 reported patients
- Global developmental delayHPOHP:0001263
- 2 of 2 reported patients
- HypsarrhythmiaHPOHP:0002521
- 2 of 2 reported patients
- Infantile spasmsHPOHP:0012469
- 2 of 2 reported patients
- Axial hypotoniaHPOHP:0008936
- 1 of 2 reported patients
- Bilateral tonic-clonic seizureHPOHP:0002069
Show the remaining 4
- Myoclonic seizureHPOHP:0032794
- 1 of 2 reported patients
- MyoclonusHPOHP:0001336
- 1 of 2 reported patients
- Reduced eye contactHPOHP:0000817
- 1 of 2 reported patients
- Epileptic encephalopathyHPOHP:0200134
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.
- GRIN2BHGNC:4586
- Definitive · G2P · Autosomal dominant · 2025
- Strong · Labcorp Genetics (formerly Invitae) · Autosomal dominant · 2021
Where it sits
Other names
7 names
Resolves to: developmental and epileptic encephalopathy, 27
- Also called
- DEE27developmental and epileptic encephalopathy 27early infantile epileptic encephalopathy caused by mutation in GRIN2BEIEE27epileptic encephalopathy, early infantile, 27epileptic encephalopathy, early infantile, type 27GRIN2B early infantile epileptic encephalopathy