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Rickets caused by a defect in the VDR gene, encoding the vitamin D receptor. This form of rickets is characterized by hypocalcemia, elevated 1,25-dihydroxyvitamin D (calcitriol) concentrations and may also manifest with alopecia.
Features include always present findings: Alopecia universalis, Epicanthus, Hearing loss (hearing impairment), and Wide nasal bridge and others. 44 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Bones and joints | 6 | Femoral bowing, Recurrent fractures, Subperiosteal bone resorption |
Muscles | 3 | Low muscle tone (hypotonia), Generalized hypotonia, Abdominal wall muscle weakness |
Brain and nerves | 3 | Irritability, Hypocalcemic seizures, Difficulty walking (gait disturbance) |
Skin | 2 | Alopecia universalis, Abnormality of the skin |
Lab test results | 2 | Elevated circulating alkaline phosphatase concentration, Elevated circulating parathyroid hormone level |
Growth and development | 2 | Failure to thrive, Growth delay |
Ears | 1 | Hearing loss (hearing impairment) |
Digestive system | 1 | Abdominal wall muscle weakness |
VDR function has not been fully characterized.
Vitamin D-dependent rickets, type 2A is associated with mutations in the VDR gene on chromosome 12.
Genetic testing for VDR is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 6 always present features.
No clinical trials have been registered for vitamin D-dependent rickets, type 2A.
13 publications have been identified in PubMed for vitamin D-dependent rickets, type 2A. Research spans Case Report / Case Series (62%), Epidemiology / Natural History (23%), and Basic Science / Preclinical (15%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 8 | 62% |
Disease patterns and progression | 3 | 23% |
Laboratory research | 2 | 15% |
Lodefalk M (2025). [PMID: 40383122](https://pubmed.ncbi.nlm.nih.gov/40383122/). *Hormone research in paediatrics*. [Case Report / Case Series]
Mehak NU (2025). [PMID: 40219799](https://pubmed.ncbi.nlm.nih.gov/40219799/). *Journal of pediatric endocrinology & metabolism : JPEM*. [Case Report / Case Series]
Improda N (2025). [PMID: 40225330](https://pubmed.ncbi.nlm.nih.gov/40225330/). *Frontiers in endocrinology*. [Case Report / Case Series]
Hasegawa K (2025). [PMID: 40201379](https://pubmed.ncbi.nlm.nih.gov/40201379/). *Clinical pediatric endocrinology : case reports and clinical investigations : official journal of the Japanese Society for Pediatric Endocrinology*. [Case Report / Case Series]
Muto M (2025). [PMID: 40763778](https://pubmed.ncbi.nlm.nih.gov/40763778/). *Nephrology (Carlton, Vic.)*. [Case Report / Case Series]
Mura-Escorche G (2025). [PMID: 40943461](https://pubmed.ncbi.nlm.nih.gov/40943461/). *International journal of molecular sciences*. [Case Report / Case Series]
Suzuki S (2025). [PMID: 41083377](https://pubmed.ncbi.nlm.nih.gov/41083377/). *The Journal of veterinary medical science*. [Epidemiology / Natural History]
Mathew V (2025). [PMID: 39862309](https://pubmed.ncbi.nlm.nih.gov/39862309/). *Pediatric nephrology (Berlin, Germany)*. [Epidemiology / Natural History]
Chiramel MJ (2025). [PMID: 39716449](https://pubmed.ncbi.nlm.nih.gov/39716449/). *Pediatric dermatology*. [Case Report / Case Series]
Han S (2025). [PMID: 40768184](https://pubmed.ncbi.nlm.nih.gov/40768184/). *Journal of endocrinological investigation*. [Case Report / Case Series]
Data assembled from 5 of 12 sources · Last updated Sep 19, 2026, 12:49 AM UTC
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