raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:476119

Autosomal dominant preaxial polydactyly-upperback hypertrichosis syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Neonatal
Status
active

A rare genetic syndrome with limb malformations as a major feature characterized by preaxial polydactyly of the hands and feet with variable phenotypic expressivity in combination with hypertrichosis extending from the posterior hairline to the middle of the back. Reported limb malformations include triphalangeal thumbs, duplicated thumbs, preaxial extra ray, and syndactyly between digits I and II in the hands, and large or duplicated hallux and syndactyly between toes I and II in the feet.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enAutosomal dominant preaxial polydactyly-upperback hypertrichosis syndrome
frSyndrome autosomique dominant de polydactylie préaxiale-hypertrichose du haut du dos
deAutosomal-dominante präaxiale Polydaktylie mit Hypertrichose des oberen Rückens
esSíndrome de polidactilia preaxial-hipertricosis de la parte superior de la espalda autosómico dominante
itSindrome autosomica dominante polidattilia preassiale-ipertricosi della parte superiore della schiena
nlAutosomaal dominant preaxiale polydactylie - hypertrichose van bovenrug-syndroom
ptSíndrome de polidactilia preaxial-hipertricose da parte superior das costas autossómica dominante
plAutosomalny dominujący zespół polidaktylii przedosiowej i hipertrichozy w górnej części pleców
csAutozomálně dominantní syndrom zahrnující preaxiální polydaktylii a hypertrichózu v horní části zad
ukАутосомно-домінантний синдром преаксіальної полідактилії-гіпертрихозу верхньої частини спини
zh常染色体显性遗传性前轴多指-上背部肥大综合征
trOtozomal dominant preaksiyal polidaktili-üst sırt hipertrikoz sendromu

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q87.2NTBTattributedvalidated
MONDO0018777Evalidated
UMLSC5568802Evalidated

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 (2):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
SHHDisease-causing germline mutation(s) inAssessedHGNC:10848ENSG000001646906007257q36.3sonic hedgehog signaling molecule25782671[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families1 familiesWorldwideFamily(ies)Validated25782671[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET_25782671[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

Orphanet has no HPO annotation for this code in this release.

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Sources for this card