raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:79096

Pyridoxamine-5-phosphate deficiency-developmental and epileptic encephalopathy

Synonyms: P5PD-DEE · PNPO-related neonatal epileptic encephalopathy · Pyridoxal phosphate-dependent seizures · Pyridoxal phosphate-responsive seizures · Pyridoxamine 5'-phosphate oxidase deficiency

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

A very rare neonatal epileptic encephalopathy disorder characterized clinically by onset of severe seizures within hours of birth that are not responsive to anticonvulsants, but are responsive to treatment with pyridoxal phosphate.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPyridoxamine-5-phosphate deficiency-developmental and epileptic encephalopathyP5PD-DEE · PNPO-related neonatal epileptic encephalopathy · Pyridoxal phosphate-dependent seizures · Pyridoxal phosphate-responsive seizures · Pyridoxamine 5'-phosphate oxidase deficiency
frEncéphalopathie développementale et épileptique pyridoxal-phosphate dépendanteConvulsions sensibles au phosphate de pyridoxal · Encéphalopathie épileptique néonatale associée à PNPO · P5PD-DEE
dePyridoxalphosphat-abhängige entwicklungsbedingte und epileptische EnzephalopathieP5PD-DEE · PNPO-Mangel · PNPO-assoziierte neonatale epileptische Enzephalopathie · Pyridoxal-Phosphat-abhängige Krämpfe · Pyridoxalphosphat-abhängige Krämpfe · Pyridoxamin-5'-phosphat-Oxidase-Mangel
esEncefalopatía epiléptica y del desarrollo por deficiencia de piridoxamina-5-fosfatoCrisis dependientes de piridoxal fosfato · Crisis sensibles al piridoxal fosfato · Deficiencia de piridoxamina 5'-fosfato oxidasa · EED-P5PD · Encefalopatía epiléptica neonatal asociada a PNPO
itConvulsioni sensibili al piridossal fosfatoConvulsioni dipendenti dal piridossal fosfato · Deficit di piridossamina 5'-fosfato ossidasi · Encefalopatia epilettica neonatale associata a PNPO
nlDeficiëntie van pyridoxamine-5-fosfaat - epileptische encefalopathie met ontwikkelingsstoornisDeficiëntie van pyridoxamine 5´-fosfaatoxidase · P5PD-DEE · PNPO-gerelateerde neonatale epileptische encefalopathie · Pyridoxaalfosfaatafhankelijke insulten · Pyridoxaalfosfaatresponsieve insulten
ptEncefalopatia epiléptica e do desenvolvimento devido a deficiência de piridoxamina-5-fosfatoConvulsões piridoxal-fosfato dependentes · Convulsões sensíveis ao piridoxal-fosfato · Deficiência de piridoxamina-5-fosfato oxidase · Encefalopatia epilética neonatal PNPO-relacionada · P5PD-DEE
plNapady reagujące na fosforan pirydoksaluNapady zależne od fosforanu pirydoksalu · Niedobór 5'-oksydazy pirydoksaminy · Niedobór oksydazy 5'-fosforanu pirydoksyaminy · Niedobór PNPO · Noworodkowa encefalopatia epileptyczna związana z PNPO
csKřeče reagující na pyridoxal-fosfátDeficit PNPO · Pyridoxal-fosfát dependentní epilepsie · Deficit pyridoxamin 5´ oxidázy · Deficit pyridox(am)in 5´-fosfát oxidázy · Neonatální epileptická encefalopatie podmíněná mutacemi v PNPO genu
ukСудоми, чутливі до піридоксальфосфатуДефіцит PNPO · Неонатальна епілептична енцефалопатія, повязана з PNPO · Піридоксальфосфат-залежні судоми · Дефіцит піридоксамін 5-оксидази · Дефіцит піридоксамін 5-фосфат-оксидази
zh磷酸吡哆醛反应性癫痫PNPO相关性新生儿癫痫性脑病
trPiridoksal fosfata duyarlı nöbetlerPNPO eksikliği · Piridoksamin 5'-oksidaz eksikliği · Piridoksal fosfata bağımlı nöbetler · Piridoksamin 5'-fosfat oksidaz eksikliği · PNPO-ilişkili yenidoğan epileptik ensefalopati

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM610090Evalidated
ICD-10G40.8NTBTattributedvalidated
ICD-115C63.YNTBTindexvalidated
MONDO0012407Evalidated
MeSHC566449Evalidated
UMLSC1864723Evalidated
GARD10730Evalidated

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 (6):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
PNPODisease-causing germline mutation(s) (loss of function) inAssessedHGNC:30260ENSG0000010843960328717q21.32pyridoxamine 5'-phosphate oxidase15772097[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyNot yet validatedORPHANET
Point prevalence1-9 / 1 000 000—EuropeClass onlyValidatedEuropean Medicines Agency 2018[OTHER]

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

29 annotations · validated 2018-09-10
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0200134Epileptic encephalopathy
HP:0002133Status epilepticus
Frequent (79-30%)
HP:0000496Abnormality of eye movement
HP:0001560Abnormality of the amniotic fluid
HP:0008936Axial hypotonia
HP:0003785Decreased CSF homovanillic acid concentration
HP:0010851EEG with burst suppression
HP:0001508Failure to thrive
HP:0011968Feeding difficulties
HP:0002283Global brain atrophy
HP:0001263Global developmental delay
HP:0025430High-pitched cry
HP:0001276Hypertonia
HP:0005961Hypoargininemia
HP:0001943Hypoglycemia
HP:0002151Increased circulating lactate concentration
HP:0030917Low APGAR score
HP:0001942Metabolic acidosis
HP:0001336Myoclonus
HP:0001622Premature birth
HP:0001250Seizure
HP:0002317Unsteady gait
Occasional (29-5%)
HP:0010904Abnormal circulating histidine concentration
HP:0010909Abnormality of arginine metabolism
HP:0010895Abnormality of glycine metabolism
HP:0010900Abnormality of threonine metabolism
HP:0010917Abnormality of tyrosine metabolism
HP:0000252Microcephaly
HP:0005522Pyridoxine-responsive sideroblastic anemia

Run the differential on the 2 obligate / very frequent terms

Annotation source: 12747882[PMID]_24645144[PMID]_24658933[PMID]_12200739[PMID]

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Sources for this card