raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:79443

Pseudohypoparathyroidism type 1A

Synonyms: AHO-PHP syndrome Ia · Albright hereditary osteodystrophy-PHP syndrome Ia

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

Pseudohypoparathyroidism type 1A (PHP1a) is a type of pseudohypoparathyroidism (PHP) characterized by renal resistance to parathyroid hormone (PTH), resulting in hypocalcemia, hyperphosphatemia, and elevated PTH; resistance to other hormones including thydroid stimulating hormone (TSH), gonadotropins and growth-hormone-releasing hormone (GHRH); and a constellation of clinical features known as Albright hereditary osteodystrophy (AHO).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPseudohypoparathyroidism type 1AAHO-PHP syndrome Ia · Albright hereditary osteodystrophy-PHP syndrome Ia
frPseudohypoparathyroïdie type 1AOHA associée à PHP Ia · Ostéodystrophie héréditaire d'Albright associée à PHP Ia
dePseudohypoparathyreoidismus Typ 1AAHO-PHP-Syndrom Ia · Albright'sche hereditäre Osteodystrophie-PHP-Syndrom Ia
esPseudohipoparatiroidismo tipo 1ASíndrome AHO-PHP Ia · Síndrome de osteodistrofia hereditaria de Albright-PPHP Ia
itPseudoipoparatiroidismo tipo 1ASindrome AHO-PHP · Sindrome da osteodistrofia ereditaria di Albright - PHP
nlPseudohypoparathyreoïdie type 1AAHO-PHP-syndroom Ia · Erfelijke osteodystrofie van Albright - PHP-syndroom Ia
ptPseudo-hipoparatiroidismo tipo 1ASíndrome AHO-PHP Ia · Síndrome de osteodistrofia hereditária Albright-PHP Ia
plRzekoma niedoczynność przytarczyc typu 1AAHO - PHP Ia · Dzidziczna osteodystrofia Albrighta - PHP Ia
csPseudohypoparatyreoidismus, typ 1AAHO-PHP syndrom Ia · Albrightova dědičná osteodystrofie - PHP syndrom Ia
ukПсевдогіпопаратиреоз, тип 1АAHO-PHP синдром Ia · Спадкова остеодистрофія Олбрайта - PHP синдром Ia
zh假性甲状旁腺功能减退症1A型Albright遗传性骨营养不良- PPHP综合征Ia型
trPsödohipoparatiroidi tip 1AAHO-PHP sendromu Ia · Albright kalıtsal osteodistrofi-PHP sendromu Ia

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM103580Evalidated
ICD-10E20.1NTBTattributedvalidated
ICD-115A50.1NTBTindexvalidated
MONDO0007078Evalidated
UMLSC3494506Evalidated
GARD7486Evalidated

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 (5):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
GNASDisease-causing germline mutation(s) (loss of function) inAssessedHGNC:4392ENSG0000008746013932020q13.32GNAS complex locus
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Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—WorldwideClass onlyValidatedORPHANET

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

68 annotations · validated 2017-03-06
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0000852Pseudohypoparathyroidism
Very frequent (99-80%)
HP:0003165Elevated circulating parathyroid hormone level
HP:0002905Hyperphosphatemia
HP:0002901Hypocalcemia
HP:0003456Low urinary cyclic AMP response to PTH administration
HP:0008227Pituitary resistance to thyroid hormone
HP:0000311Round face
HP:0004322Short stature
Frequent (79-30%)
HP:0002135Basal ganglia calcification
HP:0001156Brachydactyly
HP:0010027Broad 1st metacarpal
HP:0000518Cataract
HP:0006960Choroid plexus calcification
HP:0012185Constrictive median neuropathy
HP:0000824Decreased response to growth hormone stimulation test
HP:0000684Delayed eruption of teeth
HP:0005280Depressed nasal bridge
HP:0011986Ectopic ossification
HP:0006297Enamel hypoplasia
HP:0000293Full cheeks
HP:0011001Increased bone mineral density
HP:0001249Intellectual disability
HP:0000639Nystagmus
HP:0001513Obesity
HP:0002591Polyphagia
HP:0010044Short 4th metacarpal
HP:0010047Short 5th metacarpal
HP:0004704Short fifth metatarsal
HP:0010049Short metacarpal
HP:0010743Short metatarsal
HP:0000470Short neck
HP:0002684Thickened calvaria
Occasional (29-5%)
HP:0011458Abdominal symptom
HP:0011869Abnormal platelet function
HP:0000739Anxiety
HP:0000585Band keratopathy
HP:0009642Broad distal phalanx of the thumb
HP:0003761Calcinosis
HP:0002514Cerebral calcification
HP:0100749Chest pain
HP:0001266Choreoathetosis
HP:0001289Confusion
HP:0000509Conjunctivitis
HP:0000716Depression
HP:0002094Dyspnea
HP:0000815Hypergonadotropic hypogonadism
HP:0004438Hyperostosis frontalis interna
HP:0000822Hypertension
HP:0003472Hypocalcemic tetany
HP:0001265Hyporeflexia
HP:0004305Involuntary movements
HP:0000737Irritability
HP:0012049Laryngeal dystonia
HP:0003394Muscle spasm
HP:0003739Myoclonic spasms
HP:0000876Oligomenorrhea
HP:0025027Osteoma cutis
HP:0003401Paresthesia
HP:0001657Prolonged QT interval
HP:0004349Reduced bone mineral density
HP:0000407Sensorineural hearing impairment
HP:0010041Short 3rd metacarpal
HP:0002176Spinal cord compression
HP:0000486Strabismus
Very rare (<4-1%)
HP:0003528Elevated calcitonin
HP:0002199Hypocalcemic seizures
HP:0008202Reduced circulating prolactin concentration
Excluded (0%)
HP:0030057Autoimmune antibody positivity

Run the differential on the 8 obligate / very frequent terms

Annotation source: 21816789[PMID]_2109828[PMID]_9506735[PMID]_10700702[PMID]_2848415[PMID]_20610593[PMID]_20719837[PMID]_21525160[PMID]_24684469[PMID]_11834431[PMID]_24030943[PMID]_26160136[PMID]_18650515[PMID]_18535072[PMID]_4309802[PMID]

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Sources for this card