raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:2209

Maternal phenylketonuria syndrome

Synonyms: Hyperphenylalaninemic embryopathy · Maternal PKU syndrome · Maternal hyperphenylalaninemia · Phenylketonuric embryopathy

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal recessive
Age of onset
Antenatal, Neonatal
Status
active

A rare disorder of phenylalanine (Phe) metabolism, an inborn error of amino acid metabolism, characterized by the development of microcephaly, growth retardation, congenital heart disease, facial dysmorphism and intellectual disability in non-phenylketonuric offspring of mothers with excess blood Phe concentrations.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enMaternal phenylketonuria syndromeHyperphenylalaninemic embryopathy · Maternal PKU syndrome · Maternal hyperphenylalaninemia · Phenylketonuric embryopathy
frSyndrome de phénylcétonurie maternelleEmbryopathie hyperphénylalaninémique · Embryopathie phénylcétonurique · Hyperphénylalaninémie maternelle · Syndrome de PCU maternelle
dePhenylketonurie, maternaleEmbryopathie, phenylketonurische · Hyperphenylalanin-Embryopathie · Hyperphenylalaninämie, maternale · PKU, maternale · Phenylalanin-Embryopathie
esSíndrome de fenilcetonuria maternaEmbriopatía fenilcetonúrica · Embriopatía hiperfenilalaninémica · Hiperfenilalaninemia materna
itSindrome fenilchetonuria maternaSindrome PKU materna · Embriopatia da iperfenilalaninemia · Embriopatia fenilchetonurica · Iperfenilalaninemia materna · PKU materna
nlMaternale fenylketonurie-syndroomFenylketonurische embryopathie · Hyperfenylalaninemische embryopathie · Maternale PKU-syndroom · Maternale hyperfenylalaninemie
ptFenilcetonúria maternaEmbriopatia fenilcetonúrica · Embriopatia hiperfenilalaninémica · Hiperfenilalaninemia materna
plFenyloketonuria matczynaEmbriopatia fenyloketonowa · Embriopatia hiperfenyloalaninowa · Hiperfenyloalaninemia matczyna · PKU matczyna
csMaternální fenylketonurieHyperfenylalaninemická embryopatie · Maternální PKU · Maternální hyperfenylalaninemie · Fenylketonurická embryopatie
ukМатеринська фенілкетонуріяГіперфенілаланінемічна ембріопатія · Материнська гіперфенілаланінемія · Материнська ПКУ · Фенілкетонурична ембріопатія
zh母体苯丙酮尿症高苯丙酮尿酸血症型胚胎病
trMaternal fenilketonüriMaternal PKU · Fenilketonürik embriyopati · Maternal hiperfenilalaninemi · Hiperfenilalaninemik embriyopati

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM261600NTBTvalidated
ICD-10E70.1NTBTattributedvalidated
ICD-115C50.02Especificvalidated
MONDO0016366Evalidated
MeSHD017042Evalidated
UMLSC0085547Evalidated
GARD3413Evalidated

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

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
PAHDisease-causing germline mutation(s) inAssessedHGNC:8582ENSG0000017175961234912q23.2phenylalanine hydroxylase1915502[PMID]
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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—EuropeClass onlyValidatedORPHANET
Annual incidence1-5 / 10 00010 / 100 000EuropeValue and classValidated[EXPERT]

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

32 annotations · validated 2019-01-29
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001627Abnormal heart morphology
Frequent (79-30%)
HP:0001999Abnormal facial shape
HP:0001680Coarctation of aorta
HP:0001263Global developmental delay
HP:0004383Hypoplastic left heart
HP:0001249Intellectual disability
HP:0001511Intrauterine growth retardation
HP:0000252Microcephaly
Occasional (29-5%)
HP:0000463Anteverted nares
HP:0001719Double outlet right ventricle
HP:0000218High palate
HP:0000752Hyperactivity
HP:0002079Hypoplasia of the corpus callosum
HP:0000343Long philtrum
HP:0000347Micrognathia
HP:0001250Seizure
HP:0001636Tetralogy of Fallot
HP:0001629Ventricular septal defect
HP:0000431Wide nasal bridge
Very rare (<4-1%)
HP:0012210Abnormal renal morphology
HP:0009611Bifid distal phalanx of the thumb
HP:0001488Bilateral ptosis
HP:0002836Bladder exstrophy
HP:0001156Brachydactyly
HP:0030084Clinodactyly
HP:0004411Deviated nasal septum
HP:0000286Epicanthus
HP:0002032Esophageal atresia
HP:0008589Hypoplastic helices
HP:0000601Hypotelorism
HP:0000340Sloping forehead
HP:0000486Strabismus

Run the differential on the 1 obligate / very frequent terms

Annotation source: 22205310[PMID]_14654657[PMID]_30244725[PMID]_11328945[PMID]_10636975[PMID]_9066890[PMID]_8648535[PMID]_1481837[PMID]_1915502[PMID]_5391176[PMID]_4968669[PMID]_23784316[PMID]

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Sources for this card