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Tyrosinemia type 3 is an inborn error of tyrosine metabolism characterized by mild hypertyrosinemia and increased urinary excretion of 4-hydroxyphenylpyruvate, 4-hydroxyphenyllactate and 4-hydroxyphenylacetate.
Data assembled from 8 of 12 sources · Last updated Sep 17, 2026, 11:19 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Features include always present findings: Hypertyrosinemia, 4-Hydroxyphenylpyruvic aciduria, and 4-hydroxyphenylacetic aciduria; and common findings: Global developmental delay. 8 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 4 | Mild intellectual disability, Seizure, Global developmental delay |
Digestive system | 1 | Elevated circulating hepatic transaminase concentration |
Lab test results | 1 | Elevated circulating hepatic transaminase concentration |
HPD encodes 4-hydroxyphenylpyruvate dioxygenase (393 aa). Catalyzes the conversion of 4-hydroxyphenylpyruvic acid to homogentisic acid, one of the steps in tyrosine catabolism Highest expression in Liver (1,002 TPM) and Kidney Cortex (168.7 TPM).
Tyrosinemia type III is caused by mutations in the HPD gene on chromosome 12.
The HPD protein participates in HPD dioxygenates HPP, HPDL dioxygenates HPPA, and Unknown enzyme hydrogenates HPP pathways.
HPD is classified as a druggable target (Druggable Genome and Enzyme categories) with score 52.2.
Genetic testing for HPD is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for tyrosinemia type III has been reported in the published literature.
Phenotype severity distribution: 3 always present features, 1 common feature.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
3 clinical trials registered, 1 recruiting. Interventions under study include other interventions. Pipeline includes 1 NA. Research is sponsored by a mix of industry and academic institutions.
39 publications have been identified in PubMed for tyrosinemia type III. Research spans Case Report / Case Series (23%), Gene Therapy / Novel Therapeutics (23%), and Review / Meta-Analysis (18%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 9 | 23% |
New treatment approaches | 9 | 23% |
Research summaries | 7 | 18% |
Laboratory research | 7 | 18% |
Disease patterns and progression | 3 | 8% |
Clinical study results | 2 | 5% |
Other research | 1 | 3% |
Testing and diagnosis research | 1 | 3% |
Scarin R (2026). [PMID: 42117404](https://pubmed.ncbi.nlm.nih.gov/42117404/). *J Med Chem*. [Gene Therapy / Novel Therapeutics]
Wang J (2026). [PMID: 41317403](https://pubmed.ncbi.nlm.nih.gov/41317403/). *Adv Sci (Weinh)*. [Basic Science / Preclinical]
Gibson JR (2026). [PMID: 41928587](https://pubmed.ncbi.nlm.nih.gov/41928587/). *CRISPR J*. [Gene Therapy / Novel Therapeutics]
Basan H (2026). [PMID: 41711566](https://pubmed.ncbi.nlm.nih.gov/41711566/). *J Pediatr Endocrinol Metab*. [Case Report / Case Series]
Yılmaz-Gümüş E (2026). [PMID: 41956115](https://pubmed.ncbi.nlm.nih.gov/41956115/). *J Pediatr Endocrinol Metab*. [Case Report / Case Series]
Motazedian N (2026). [PMID: 41736130](https://pubmed.ncbi.nlm.nih.gov/41736130/). *Orphanet J Rare Dis*. [Diagnostic / Biomarker]
Yazdani AH (2026). [PMID: 40237876](https://pubmed.ncbi.nlm.nih.gov/40237876/). *Biochem Genet*. [Epidemiology / Natural History]
Adnan M (2026). [PMID: 35201733](https://pubmed.ncbi.nlm.nih.gov/35201733/). *Unknown Journal*. [Review / Meta-Analysis]
Sun Y (2026). [PMID: 41645451](https://pubmed.ncbi.nlm.nih.gov/41645451/). *Protein Cell*. [Gene Therapy / Novel Therapeutics]
Saraceno E (2026). [PMID: 41596311](https://pubmed.ncbi.nlm.nih.gov/41596311/). *Int J Mol Sci*. [Case Report / Case Series]
AI-curated news mentioning tyrosinemia type III
Updated Jun 5, 2024
A study identifies and characterizes novel variants of the FAH gene in patients suspected of having Tyrosinemia Type 1. This research enhances understanding of genetic variations associated with the disease, potentially guiding future diagnostics and treatments.