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Any hyperphosphatasia-intellectual disability syndrome in which the cause of the disease is a mutation in the PIGV gene.
Features include always present findings: Elevated circulating alkaline phosphatase concentration, Low muscle tone (hypotonia), Short distal phalanx of finger, and Intellectual disability and others; and very common findings: Hypertelorism, Downturned corners of mouth, Broad nasal tip, and Wide nasal bridge. 47 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 8 | Cerebral cortical atrophy, Seizure, Severe intellectual disability |
Head and neck | 5 | Tented upper lip vermilion, Thin upper lip vermilion, Cleft palate |
Muscles | 3 | Cerebral cortical atrophy, Low muscle tone (hypotonia), Generalized hypotonia |
Arms and legs | 3 | Short distal phalanx of finger, Tapered finger, Short toe |
Skin | 2 | Small nail, Hyperconvex nail |
Ears | 2 | Hearing loss (hearing impairment), Inner ear hearing loss (sensorineural hearing impairment) |
Digestive system | 2 | Constipation, Feeding difficulties |
Lab test results | 1 | Elevated circulating alkaline phosphatase concentration |
Kidneys and urinary system | 1 | Abnormal renal morphology |
Heart and blood vessels | 1 | Abnormal heart morphology |
Bones and joints | 1 | Delayed ossification of carpal bones |
Age of onset: infancy.
PIGV function has not been fully characterized.
Hyperphosphatasia with intellectual disability syndrome 1 has been associated with mutations in the PIGV gene on chromosome 1.
Genetic testing for PIGV is available. Testing is considered supportive for diagnosis.
Phenotype severity distribution: 6 always present features, 4 very common features, 13 common features.
No clinical trials have been registered for hyperphosphatasia with intellectual disability syndrome 1.
7 publications have been identified in PubMed for hyperphosphatasia with intellectual disability syndrome 1. Research spans Case Report / Case Series (71%), Review / Meta-Analysis (14%), and Basic Science / Preclinical (14%).
Wilke MVMB (2026). [PMID: 40799153](https://pubmed.ncbi.nlm.nih.gov/40799153/). *American journal of medical genetics. Part A*. [Case Report / Case Series]
Beşen Ş (2026). [PMID: 41622609](https://pubmed.ncbi.nlm.nih.gov/41622609/). *Annals of Indian Academy of Neurology*. [Review / Meta-Analysis]
Burgac E (2025). [PMID: 41064048](https://pubmed.ncbi.nlm.nih.gov/41064048/). *Molecular syndromology*. [Case Report / Case Series]
Zambiasi A (2025). [PMID: 40514788](https://pubmed.ncbi.nlm.nih.gov/40514788/). *Prenatal diagnosis*. [Case Report / Case Series]
Wang X (2025). [PMID: 41169893](https://pubmed.ncbi.nlm.nih.gov/41169893/). *Frontiers in pediatrics*. [Case Report / Case Series]
Rabouhi N (2025). [PMID: 40239339](https://pubmed.ncbi.nlm.nih.gov/40239339/). *Pediatric neurology*. [Basic Science / Preclinical]
Thompson MD (2024). [PMID: 38790248](https://pubmed.ncbi.nlm.nih.gov/38790248/). *Genes*. [Case Report / Case Series]
Data assembled from 6 of 12 sources · Last updated Sep 19, 2026, 2:55 PM UTC
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