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Thyroid peroxidase system defect due to presumed mutation(s) in the TPO gene, resulting in decreased activity of thyroid peroxidase.
Features include always present findings: Decreased circulating T4 concentration, Thyroid defect in oxidation and organification of iodide, Hypothyroidism, and Goiter.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Hormones | 2 | Thyroid defect in oxidation and organification of iodide, Hypothyroidism |
TPO function has not been fully characterized.
Thyroid dyshormonogenesis 2A is associated with mutations in the TPO gene on chromosome 2.
Genetic testing for TPO is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for thyroid dyshormonogenesis 2A has been reported in the published literature.
Phenotype severity distribution: 4 always present features.
1 clinical trial registered. Interventions under study include other interventions. Research is primarily sponsored by academic and government institutions.
8 publications have been identified in PubMed for thyroid dyshormonogenesis 2A. Research spans Basic Science / Preclinical (38%), Case Report / Case Series (25%), and Epidemiology / Natural History (25%).
Gawandi S (2026). [PMID: 41675115](https://pubmed.ncbi.nlm.nih.gov/41675115/). *Indian journal of clinical biochemistry : IJCB*. [Case Report / Case Series]
Kurnaz E (2026). [PMID: 39378853](https://pubmed.ncbi.nlm.nih.gov/39378853/). *Horm Res Paediatr*. [Epidemiology / Natural History]
Jiang R (2026). [PMID: 41727961](https://pubmed.ncbi.nlm.nih.gov/41727961/). *J Transl Int Med*. [Basic Science / Preclinical]
Islam MS (2026). [PMID: 41004687](https://pubmed.ncbi.nlm.nih.gov/41004687/). *J Clin Endocrinol Metab*. [Basic Science / Preclinical]
Su Y (2025). [PMID: 41133710](https://pubmed.ncbi.nlm.nih.gov/41133710/). *Int J Neonatal Screen*. [Diagnostic / Biomarker]
Data assembled from 6 of 12 sources · Last updated Sep 19, 2026, 12:59 PM UTC
Online Mendelian Inheritance in Man
Genetic and Rare Diseases Info Center
Dalal A (2025). [PMID: 38986456](https://pubmed.ncbi.nlm.nih.gov/38986456/). *Horm Res Paediatr*. [Basic Science / Preclinical]
van Gisbergen M (2025). [PMID: 39890415](https://pubmed.ncbi.nlm.nih.gov/39890415/). *BMJ Case Rep*. [Case Report / Case Series]
Arteaga-Jacobo MC (2024). [PMID: 39064575](https://pubmed.ncbi.nlm.nih.gov/39064575/). *Medicina (Kaunas)*. [Epidemiology / Natural History]