hyperphosphatasia with intellectual disability syndrome 4
Findings
No curated finding names hyperphosphatasia with intellectual disability syndrome 4 yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Any hyperphosphatasia-intellectual disability syndrome in which the cause of the disease is a mutation in the PGAP3 gene.
Definition from the Mondo Disease Ontology (MONDO:0014318), read 2026-09-29. CC BY 4.0.
- Inheritance
- Autosomal recessive inheritance
- Onset and course
- Infantile onset
HPO, annotations 2026-09-02
Features
26 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Absent speechHPOHP:0001344
- 5 of 5 reported patients
- Broad nasal tipHPOHP:0000455
- 5 of 5 reported patients
- Delayed gross motor developmentHPOHP:0002194
- 5 of 5 reported patients
- Elevated circulating alkaline phosphatase concentrationHPOHP:0003155
- 5 of 5 reported patients
- Global developmental delayHPOHP:0001263
- 5 of 5 reported patients
- HypertelorismHPOHP:0000316
- 5 of 5 reported patients
- HypotoniaHPO
Show the remaining 14
- SeizureHPOHP:0001250
- 4 of 5 reported patients
- Bilateral tonic-clonic seizureHPOHP:0002069
- 3 of 4 reported patients
- BruxismHPOHP:0003763
- 3 of 5 reported patients
- Involuntary movementsHPOHP:0004305
- 3 of 5 reported patients
- MicrocephalyHPOHP:0000252
- 3 of 5 reported patients
- Upslanted palpebral fissureHPOHP:0000582
- 3 of 5 reported patients
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- PGAP3HGNC:23719
- Definitive · ClinGen · Autosomal recessive · 2023
- Definitive · G2P · Autosomal recessive · 2015
- Strong · Labcorp Genetics (formerly Invitae) · Autosomal recessive · 2023
- Strong · PanelApp Australia · Autosomal recessive · 2025
Where it sits
Other names
5 names
Resolves to: hyperphosphatasia with intellectual disability syndrome 4
- Also called
- hyperphosphatasia with intellectual disability syndrome type 4hyperphosphatasia with mental retardation syndrome 4hyperphosphatasia with mental retardation syndrome type 4hyperphosphatasia-intellectual disability syndrome caused by mutation in PGAP3PGAP3 hyperphosphatasia-intellectual disability syndrome