raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:589547

GRIN2B-related developmental delay, intellectual disability and autism spectrum disorder

Synonyms: GRIN2B-Related Neurodevelopmental Disorder

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

A rare genetic syndromic intellectual disability characterized by infantile or childhood onset of mild to profound developmental delay and intellectual disability in all affected individuals, as well as variable occurrence of epilepsy, autism spectrum disorder / behavioral issues, microcephaly, muscle tone abnormalities such as hypotonia and spasticity, dystonic, dyskinetic, or choreiform movement disorder, and cortical visual impairment. Brain MRI may reveal abnormal cortical development, hypoplastic corpus callosum, enlarged/dysplastic basal ganglia, and hippocampal dysplasia.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enGRIN2B-related developmental delay, intellectual disability and autism spectrum disorderGRIN2B-Related Neurodevelopmental Disorder
frRetard de développement, déficience intellectuelle et trouble du spectre de l'autisme associés à GRIN2BTrouble neurologique du développement associé à GRIN2B
deGRIN2B-assoziierte Entwicklungsverzögerung mit Intelligenzminderung und Autismus-Spektrum-StörungNeurologische Entwicklungsstörung, GRIN2B-assoziierte
esRetraso del desarrollo, discapacidad intelectual y trastorno del espectro autista asociados al gen GRIN2BTrastorno del neurodesarrollo asociado a GRIN2B · Trastorno del neurodesarrollo asociado al gen GRIN2B
itRitardo dello sviluppo, disabilit intellettiva, disturbo dello spettro autistico correlati a GRIN2B
nlGRIN2B-gerelateerde ontwikkelingsachterstand, intellectuele achterstand en autismespectrumstoornisGRIN2B-gerelateerde neurologische ontwikkelingsstoornis
ptPerturbação do desenvolvimento, perturbação do desenvolvimento intelectual e espectro clínico de autismo GRIN2B-relacionadaDoença do neurodesenvolvimento GRIN2B-relacionada
plNiepełnosprawność intelektualna, zaburzenie ze spektrum autyzmu oraz opóżnienie rozwoju związane z GRIN2BZwiązane z GRIN2B opóźnienie rozwoju, niepełnosprawność intelektualna i zaburzenia ze spektrum autyzmu
csVývojové opoždění, mentální retardace a porucha autistického spektra související s GRIN2B= en
ukЗатримка розвитку, інтелектуальна недостатність та розлади аутистичного спектру, повязані з GRIN2BРозлад нейророзвитку, повязаний з GRIN2B
zhGRIN2B-related developmental delay, intellectual disability and autism spectrum disorder
trGRIN2B-related developmental delay, intellectual disability and autism spectrum disorder

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM613970Evalidated
ICD-10G93.4NTBTattributedvalidated
MONDO0035122Evalidated
MONDO13509Evalidated
MONDO35122Evalidated
UMLSC5681638Evalidated

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 (2):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
GRIN2BDisease-causing germline mutation(s) inAssessedHGNC:4586ENSG0000027307913825212p13.1glutamate ionotropic receptor NMDA type subunit 2B29851452[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families98 casesWorldwideCase(s)Validated28377535[PMID]_31085877[PMID]_34568804[PMID]_34615535[PMID]
Point prevalence<1 / 1 000 000—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

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card