raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:3006

Pyridoxine-dependent-developmental and epileptic encephalopathy

Synonyms: Antiquitin deficiency · PD-DEE · Vitamin B6-dependent seizures

Type
Disease
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Antenatal, Infancy, Neonatal
Status
active

A rare neurometabolic disease characterized by recurrent intractable seizures in the prenatal, neonatal and postnatal period that are resistant to anti-epileptic drugs (AEDs) but that are responsive to pharmacological dosages of pyridoxine (vitamin B6).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPyridoxine-dependent-developmental and epileptic encephalopathyAntiquitin deficiency · PD-DEE · Vitamin B6-dependent seizures
frEncéphalopathie développementale et épileptique pyridoxino-dépendanteDéficit en antiquitine · Epilepsie vitamine B6-dépendante · PD-DEE
dePyridoxin-abhängige entwicklungsbedingte und epileptische EnzephalopathieAntiquitin-Defizienz · Antiquitin-Mangel · PD-DEE · Pyridoxinabhängige Krämpfe (PDS) · Vitamin B6-abhängige Anfälle
esEncefalopatía epiléptica y del desarrollo dependiente de piridoxinaCrisis dependientes de vitamina B6 · Deficiencia de antiquitina · EED dependiente de piridoxina
itEpilessia dipendente dalla piridossinaConvulsioni dipendenti dalla vitamina B6 · Deficit di antiquitina
nlPyridoxineafhankelijke epileptische encefalopathie met ontwikkelingsstoornisAntiquitinedeficiëntie · PD-DEE · Vitamine B6-afhankelijke insulten
ptEncefalopatia epiléptica e do desenvolvimento piridoxina-dependenteDeficiência de antiquitina · Epilepsia sensível à vitamina B6 · PD-DEE
plPadaczka zależna od pirydoksynyNapady padaczkowe zależne od witaminy B6 · Niedobór antykwityny
csPyridoxin-dependentní epilepsieDeficit antiquitinu · Pyridoxin-responzivní křeče
ukПіридоксинзалежна епілепсіяДефіцит антиквітину · Вітамін В6-залежні судоми
zh维生素B6依赖性癫痫维生素B6依赖性癫痫
trPiridoksine bağımlı epilepsiAntikitin eksikliği · B6 vitaminine bağımlı nöbetler

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM266100BTNTvalidated
OMIM617290BTNTvalidated
ICD-10G40.8Especificvalidated
ICD-118A61.0YNTBTindexvalidated
MONDO0009945Evalidated
MeSHC536254Evalidated
UMLSC1849508Evalidated
GARD9298Evalidated

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 (5):

No children.

4

Genes

2 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ALDH7A1Disease-causing germline mutation(s) inAssessedHGNC:877ENSG000001649041073235q23.2aldehyde dehydrogenase 7 family member A120301659[PMID]
PLPBPDisease-causing germline mutation(s) inAssessedHGNC:9457ENSG000001474716044368p11.23pyridoxal phosphate binding protein27912044[PMID]
5

Prevalence and incidence

5 records
TypeClassValueAreaQualificationValidationSource
Prevalence at birth1-9 / 1 000 0000.2 / 100 000EuropeValue and classValidated[EXPERT]
Prevalence at birth1-9 / 1 000 0000.13 / 100 000United KingdomValue and classValidated10519720[PMID]
Prevalence at birth1-9 / 1 000 0000.25 / 100 000NetherlandsValue and classValidated16159904[PMID]
Prevalence at birth1-9 / 100 0005 / 100 000GermanyValue and classNot yet validated10356240[PMID]_ORPHANET
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET

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

35 annotations · validated 2021-04-08
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0001250Seizure
Frequent (79-30%)
HP:0010851EEG with burst suppression
HP:0010845EEG with generalized slow activity
HP:0011152Early onset absence seizures
HP:0011968Feeding difficulties
HP:0025116Fetal distress
HP:0020217Focal aware motor seizure
HP:0007359Focal-onset seizure
HP:0002079Hypoplasia of the corpus callosum
HP:0000737Irritability
HP:0030917Low APGAR score
HP:0002643Neonatal respiratory distress
HP:0012758Neurodevelopmental delay
HP:0001557Prenatal movement abnormality
HP:0002133Status epilepticus
Occasional (29-5%)
HP:0000496Abnormality of eye movement
HP:0010819Atonic seizure
HP:0012444Brain atrophy
HP:0002188Delayed CNS myelination
HP:0011198EEG with generalized epileptiform discharges
HP:0011199EEG with generalized sharp slow waves
HP:0002280Enlarged cisterna magna
HP:0011097Epileptic spasm
HP:0000273Facial grimacing
HP:0011166Focal myoclonic seizure
HP:0002521Hypsarrhythmia
HP:0001249Intellectual disability
HP:0012420Meconium stained amniotic fluid
HP:0010841Multifocal epileptiform discharges
HP:0012768Neonatal asphyxia
HP:0000711Restlessness
HP:0002119Ventriculomegaly
HP:0012704Widened subarachnoid space
Very rare (<4-1%)
HP:0001943Hypoglycemia
HP:0003128Lactic acidosis

Run the differential on the 1 obligate / very frequent terms

Annotation source: 31737911[PMID]_33200442[PMID]_20301659[PMID]

7

Sources for this card