raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:561854

FOXG1 syndrome

Synonyms: FOXG1-related epileptic-dyskinetic encephalopathy

Type
Disease
Group
Disorder
Age of onset
Neonatal
Status
active

A rare genetic neurological disorder characterized by early onset of microcephaly, severe global developmental delay and cognitive impairment, dyskinesia and hyperkinetic movements, visual impairment, autistic behavior, stereotypies, sleep disturbance, epilepsy, and cerebral malformations (such as corpus callosum hypogenesis, forebrain anomaly, and delayed myelination). Speech is minimal or absent, and ambulation is not attained. Patients with a larger 14q12 microdeletion show a more severe phenotype than those with intragenic alterations, with the addition of facial dysmorphism and agenesis of the corpus callosum.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enFOXG1 syndromeFOXG1-related epileptic-dyskinetic encephalopathy
frSyndrome FOXG1Encéphalopathie épileptique-dyskinétique liée à FOXG1
deFOXG1-SyndromEnzephalopathie, epileptisch-dyskinetische, FOXG1-assoziierte
esSíndrome FOXG1Encefalopatía epiléptica-discinética asociada a FOXG1 · Encefalopatía epiléptica-discinética asociada al gen FOXG1
itSindrome FOXG1Encefalopatia epilettica correlata a FOXG1 · Encefalopatia epilettica discinetica correlata a FOXG1
nlFOXG1-syndroomFOXG1-gerelateerde epileptische-dyskinetische encefalopathie
ptSíndrome FOXG1Encefalopatia epilética-discinésia FOXG1-relacionada
plZespół FOXG1Encefalopatia padaczkowa związana z FOXG1
csSyndrom FOXG1= en
ukСиндром FOXG1Епілептично-дискінетична енцефалопатія, повязана з FOXG1
zhFOXG1基因综合征FOXG1基因相关癫痫性脑病
trFOXG1 sendromuFOXG1-ilişkili epileptik ensefalopati

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM613454Evalidated
ICD-10Q04.8NTBTattributedvalidated
MONDO0035383Evalidated
MONDO100040Evalidated
MONDO35383Evalidated
UMLSC3150705Evalidated
GARD12825Evalidated

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

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Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (4):

Children (2):

4

Genes

0 direct · 2 via subtypes

Orphanet records no gene directly on this code.

Recorded by Orphanet on subtypes of this disorder:

GeneSubtypeAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
FOXG1ORPHA:598164FOXG1 syndrome due to intragenic alterationDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:3811ENSG0000017616516487414q12forkhead box G131454984[PMID]
FOXG1ORPHA:261144FOXG1 syndrome due to 14q12 microdeletionRole in the phenotype ofAssessedHGNC:3811ENSG0000017616516487414q12forkhead box G123895774[PMID]
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Prevalence and incidence

0 records

No prevalence record in this release.

6

HPO phenotypes

49 annotations · validated 2020-08-26
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000733Abnormal repetitive mannerisms
HP:0100660Dyskinesia
HP:0011968Feeding difficulties
HP:0001288Gait disturbance
HP:0001252Hypotonia
HP:0001270Motor delay
HP:0000253Progressive microcephaly
HP:0000486Strabismus
Frequent (79-30%)
HP:0001273Abnormal corpus callosum morphology
HP:0100022Abnormality of movement
HP:0001344Absent speech
HP:0000729Autistic behavior
HP:0002069Bilateral tonic-clonic seizure
HP:0003763Bruxism
HP:0001266Choreoathetosis
HP:0100543Cognitive impairment
HP:0002019Constipation
HP:0004325Decreased body weight
HP:0012448Delayed myelination
HP:0001332Dystonia
HP:0003781Excessive salivation
HP:0007359Focal-onset seizure
HP:0002020Gastroesophageal reflux
HP:0002487Hyperkinetic movements
HP:0030215Inappropriate crying
HP:0012469Infantile spasms
HP:0001336Myoclonus
HP:0002310Orofacial dyskinesia
HP:0000749Paroxysmal bursts of laughter
HP:0000817Reduced eye contact
HP:0011344Severe global developmental delay
HP:0008850Severe postnatal growth retardation
HP:0004322Short stature
HP:0002360Sleep abnormality
HP:0001257Spasticity
HP:0000505Visual impairment
Occasional (29-5%)
HP:0002795Abnormal respiratory system physiology
HP:0001274Agenesis of corpus callosum
HP:0002376Developmental regression
HP:0002079Hypoplasia of the corpus callosum
HP:0002540Inability to walk
HP:0002751Kyphoscoliosis
HP:0007766Optic disc hypoplasia
HP:0001302Pachygyria
HP:0002465Poor speech
HP:0012760Reduced social responsiveness
HP:0002650Scoliosis
Very rare (<4-1%)
HP:0002133Status epilepticus
HP:0012171Stereotypical hand wringing

Run the differential on the 8 obligate / very frequent terms

Annotation source: 31454984[PMID]_28661489[PMID]

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Sources for this card