Non-specific early-onset epileptic…

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Non-specific early-onset epileptic encephalopathy

ORPHA:442835Disease

Also called Non-specific EOEE · Undetermined EOEE · Undetermined early-onset epileptic encephalopathy

What it is

A rare infantile epilepsy syndrome characterized by early onset of seizures of variable type and severity, potentially associated with a spectrum of clinical signs and symptoms including delay or lack of psychomotor development, intellectual disability, poor or absent speech development, behavioral abnormalities, hypotonia, movement disorders, spasticity, microcephaly, and dysmorphic facial features, among others. Brain imaging findings are also variable and may include cerebral atrophy or white matter abnormalities.

Key facts

Age of onset
Infancy, Neonatal
Inheritance
Autosomal dominant, Autosomal recessive, Not applicable, X-linked recessive
Classified as
Disease

Signs and symptoms

These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.

Genes

AARS1Disease-causing germline mutation(s) (loss of function)
ACTL6BDisease-causing germline mutation(s)
AP3B2Disease-causing germline mutation(s)
ATP1A2Disease-causing germline mutation(s)
ATP1A3Disease-causing germline mutation(s)
ATP6V1ADisease-causing germline mutation(s)
CACNA1ADisease-causing germline mutation(s)
CACNA1BDisease-causing germline mutation(s) (loss of function)
CACNA2D1Disease-causing germline mutation(s)
CDK19Disease-causing germline mutation(s)
CELF2Disease-causing germline mutation(s)
CLTCDisease-causing germline mutation(s)
CNKSR2Disease-causing germline mutation(s)
CYFIP2Disease-causing germline mutation(s)
DALRD3Disease-causing germline mutation(s) (loss of function)
DEPDC5Disease-causing germline mutation(s)
DHDDSDisease-causing germline mutation(s)
DNM1Disease-causing germline mutation(s)
EEF1A2Disease-causing germline mutation(s)
FBXO28Disease-causing germline mutation(s)
FGF12Disease-causing germline mutation(s) (gain of function)
FOXG1Disease-causing germline mutation(s)
FZR1Disease-causing germline mutation(s)
GABBR2Disease-causing germline mutation(s)
GABRA2Disease-causing germline mutation(s)
GABRA5Disease-causing germline mutation(s)
GABRB2Disease-causing germline mutation(s)
GABRG2Disease-causing germline mutation(s)
GRIN2DDisease-causing germline mutation(s) (gain of function)
HCN1Disease-causing germline mutation(s) (gain of function)
KCNA2Disease-causing germline mutation(s) (loss of function)
KCNB1Disease-causing germline mutation(s)
KCNC2Disease-causing germline mutation(s) (loss of function)
KCNH5Disease-causing germline mutation(s)
MDGA2Disease-causing germline mutation(s)
NECAP1Disease-causing germline mutation(s) (loss of function)
NTRK2Disease-causing germline mutation(s)
NUS1Disease-causing germline mutation(s)
PACS2Disease-causing germline mutation(s)
PARS2Disease-causing germline mutation(s)
PPP3CADisease-causing germline mutation(s)
SCN1ADisease-causing germline mutation(s)
SCN3ADisease-causing germline mutation(s)
SCN8ADisease-causing germline mutation(s) (gain of function)
SLC13A5Disease-causing germline mutation(s)
SLC1A2Disease-causing germline mutation(s)
SLC38A3Disease-causing germline mutation(s)
SYNJ1Disease-causing germline mutation(s)
SZT2Disease-causing germline mutation(s)
TRAK1Disease-causing germline mutation(s) (loss of function)
UBA5Disease-causing germline mutation(s) (loss of function)
UFSP2Disease-causing germline mutation(s) (loss of function)
YWHAGDisease-causing germline mutation(s)
SYNGAP1Candidate gene tested

ICD-10 codes

G40.4filed under a broader ICD-10 category — shared with 28 other rare diseases

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Benefit programs to look at

Programs whose eligibility touches the same ICD-10 categories. Eligibility is decided by the administering agency, never by this page.

Cross-references

MONDO 0018614OMIM 301058OMIM 614558OMIM 615476OMIM 615833OMIM 615871OMIM 615905OMIM 616056OMIM 616339OMIM 616346OMIM 616366OMIM 616409OMIM 617020OMIM 617105OMIM 617106OMIM 617132OMIM 617153OMIM 617162OMIM 617166OMIM 617665OMIM 617711OMIM 617771OMIM 617829OMIM 617830OMIM 617831OMIM 617836OMIM 617854OMIM 617938OMIM 618008OMIM 618012OMIM 618067OMIM 618201OMIM 618396OMIM 618437OMIM 618468OMIM 618497OMIM 618557OMIM 618559OMIM 618910OMIM 618916OMIM 618959OMIM 619124OMIM 619317OMIM 619561OMIM 619605OMIM 619606OMIM 619777OMIM 619814OMIM 619881OMIM 619913OMIM 619922OMIM 619970OMIM 620028OMIM 620033OMIM 620115OMIM 620145OMIM 620149OMIM 620352OMIM 620504OMIM 620537OMIM 621608UMLS C5680057

Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.

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