raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:697160

Infantile epileptic spasms syndrome

Synonyms: IESS

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant, Autosomal recessive, X-linked dominant
Age of onset
Childhood, Infancy, Neonatal
Status
active

Orphadata ships no English definition for this code.

1

Names in Orphadata languages

9 of 12 languages
LangNameSynonyms
enInfantile epileptic spasms syndromeIESS
frSyndrome des spasmes infantilesSSI
deInfantile SpasmenBNS-Epilepsie · Blitz-Nick-Salaam Epilepsie · Blitz-Nick-Salaam-Krämpfe · IESS
esSíndrome de crisis epilépticas infantiles= en
itSindrome da spasmi epilettici infantili= en
nlInfantiele epileptische spasmen-syndroom= en
ptInfantile epileptic spasms syndrome
plInfantile epileptic spasms syndrome= en
csInfantile epileptic spasms syndrome= en
2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM300672BTNTvalidated
OMIM308350BTNTvalidated
OMIM613477BTNTvalidated
OMIM613722BTNTvalidated
OMIM616139BTNTvalidated
OMIM616341BTNTvalidated
OMIM617065BTNTvalidated
OMIM617929BTNTvalidated
OMIM618298BTNTvalidated
ICD-10G40.4NTBTinclusionvalidated
ICD-118A62.0Especificvalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

Codes that Orphanet moved or referred to this one:

4

Genes

13 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
GRIN2BDisease-causing germline mutation(s) (gain of function) inAssessedHGNC:4586ENSG0000027307913825212p13.1glutamate ionotropic receptor NMDA type subunit 2B24272827[PMID]
ARXDisease-causing germline mutation(s) inAssessedHGNC:18060ENSG00000004848300382Xp21.3aristaless related homeobox20506206[PMID]_22787626[PMID]
CDKL5Disease-causing germline mutation(s) inAssessedHGNC:11411ENSG00000008086300203Xp22.13cyclin dependent kinase like 518564362[PMID]_22196487[PMID]_22787626[PMID]
CNPY3Disease-causing germline mutation(s) inAssessedHGNC:11968ENSG000001371616107746p21.1canopy FGF signaling regulator 329394991[PMID]
GUF1Disease-causing germline mutation(s) inAssessedHGNC:25799ENSG000001518066170644p12GTP binding elongation factor GUF126486472[PMID]
NTRK2Disease-causing germline mutation(s) inAssessedHGNC:8032ENSG000001480536004569q21.33neurotrophic receptor tyrosine kinase 229100083[PMID]
PHACTR1Disease-causing germline mutation(s) inAssessedHGNC:20990ENSG000001121376087236p24.1phosphatase and actin regulator 130256902[PMID]
PIGADisease-causing germline mutation(s) inAssessedHGNC:8957ENSG00000165195311770Xp22.2phosphatidylinositol glycan anchor biosynthesis class A24357517[PMID]
PLCB1Disease-causing germline mutation(s) inAssessedHGNC:15917ENSG0000018262160712020p12.3phospholipase C beta 120833646[PMID]_22196487[PMID]
SCN2ADisease-causing germline mutation(s) inAssessedHGNC:10588ENSG000001365311823902q24.3sodium voltage-gated channel alpha subunit 223935176[PMID]
SIK1Disease-causing germline mutation(s) inAssessedHGNC:11142ENSG0000014217860570521q22.3salt inducible kinase 125839329[PMID]
SPTAN1Disease-causing germline mutation(s) inAssessedHGNC:11273ENSG000001976941828109q34.11spectrin alpha, non-erythrocytic 122196487[PMID]_18065176[PMID]
WDR45Disease-causing germline mutation(s) inAssessedHGNC:28912ENSG00000196998300526Xp11.23WD repeat domain 4527030146[PMID]
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalence1-9 / 100 000—WorldwideClass onlyValidatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

6 annotations · validated 2017-09-04
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0002376Developmental regression
HP:0002521Hypsarrhythmia
HP:0012469Infantile spasms
HP:0001336Myoclonus
Frequent (79-30%)
HP:0011121Abnormal skin morphology
HP:0000707Abnormality of the nervous system

Run the differential on the 4 obligate / very frequent terms

Annotation source: 28846304[PMID]

7

Sources for this card