raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:13

6-pyruvoyl-tetrahydropterin synthase deficiency

Synonyms: Hyperphenylalaninemia due to 6-pyruvoyltetrahydropterin synthase deficiency

Type
Clinical subtype
Group
Subtype of disorder
Inheritance
Autosomal recessive
Age of onset
Infancy, Neonatal
Status
active

A rare form of hyperphenylalaninemia due to tetrahydropterin (BH4) biosynthesis deficiency, leading to central dopamine and serotonin deficiency, and characterized by infantile-onset neurological disease of variable severity ranging from mild forms with normal neurological development to severe forms with hypotonia, developmental delay, complex movement disorder dominated by dystonia or dystonia parkinsonism.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
en6-pyruvoyl-tetrahydropterin synthase deficiencyHyperphenylalaninemia due to 6-pyruvoyltetrahydropterin synthase deficiency
frDéficit en 6-pyruvoyl-tétrahydroptérine synthaseHyperphénylalaninémie par déficit en 6-pyruvoyl-tétrahydroptérine synthase
de6-Pyruvoyl-Tetrahydropterin-Synthase-MangelHyperphenylalalinanämie durch 6-Pyruvoyl-Tetrahydropterin-Synthase-Mangel · Hyperphenylalaninämie mit Tetrahydrobiopterin-Mangel, A · PTS-Mangel
esDeficiencia de 6-piruvil-tetrahidropterina sintasa
itDeficit di 6-piruvoil-tetraidropterina-sintasiIperfenilalaninemia da deficit di 6-piruvoil-tetraidropterina-sintasi
nlDeficiëntie van 6-pyruvoyl-tetrahydropterinesynthaseHyperfenylalaninemie door deficiëntie van 6-pyruvoyl-tetrahydropterinesynthase
ptDeficiência de 6-piruvoil-tetrahidropterina sintaseHiperfenilalaninemia por deficiência de 6-piruvoil-tetrahidropterina sintase
plNiedobór syntzay 6-pirogronylo-tetrahydropteryny= en
csDeficit 6-pyruvoyl-tetrahydropterin syntázyHyperfenylalaninémie způsobená deficitem 6-pyruvoyltetrahydropterin syntázy
ukДефіцит 6-пірувоїл-тетрагідроптеринсинтазиГіперфенілаланінемія внаслідок дефіциту 6-пірувоилтетрагідроптеринсинтази
zh6-丙酮酰-四氢蝶呤合成酶缺乏症6-丙酮酰四氢蝶呤合成酶缺乏致高苯丙氨酸血症
tr6-piruvoil-tetrahidropterin sentaz eksikliği6-piruvoiltetrahidropterin sentaz eksikliğine bağlı hiperfenilalaninemi

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM261640Evalidated
ICD-10E70.1NTBTattributedvalidated
ICD-115C59.01NTBTindexvalidated
MONDO0009863Evalidated
MeSHC535325Evalidated
UMLSC0878676Evalidated
GARD5682Evalidated

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 (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
PTSDisease-causing germline mutation(s) inAssessedHGNC:9689ENSG0000015078761271911q23.16-pyruvoyltetrahydropterin synthase
5

Prevalence and incidence

5 records
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyValidated30853107[PMID]_32456656[PMID]_ORPHANET
Prevalence at birth<1 / 1 000 000—EuropeClass onlyValidated30853107[PMID]_32456656[PMID]
Prevalence at birth<1 / 1 000 0000.0854 / 100 000BrazilValue and classValidated28801146[PMID]
Prevalence at birth1-9 / 1 000 0000.3094 / 100 000ChinaValue and classValidated33980295[PMID]
Prevalence at birth1-9 / 100 0002.5258 / 100 000Hong KongValue and classValidated24803483[PMID]_24992243[PMID]

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

31 annotations · validated 2017-04-05
HPOTerm (as annotated by Orphanet)Diagnostic
Frequent (79-30%)
HP:0001252Hypotonia
HP:0002179Opisthotonus
Occasional (29-5%)
HP:0002071Abnormality of extrapyramidal motor function
HP:0000713Agitation
HP:0001251Ataxia
HP:0002067Bradykinesia
HP:0002072Chorea
HP:0001266Choreoathetosis
HP:0002169Clonus
HP:0000750Delayed speech and language development
HP:0000716Depression
HP:0002329Drowsiness
HP:0002015Dysphagia
HP:0001332Dystonia
HP:0003781Excessive salivation
HP:0002527Falls
HP:0001263Global developmental delay
HP:0002487Hyperkinetic movements
HP:0001347Hyperreflexia
HP:0001276Hypertonia
HP:0002521Hypsarrhythmia
HP:0001249Intellectual disability
HP:0001270Motor delay
HP:0001336Myoclonus
HP:0010553Oculogyric crisis
HP:0000980Pallor
HP:0002421Poor head control
HP:0000508Ptosis
HP:0000711Restlessness
HP:0002063Rigidity
HP:0001250Seizure

Annotation source: 11388593[PMID]

7

Sources for this card