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Features include always present findings: Aplasia of the thymus, Abnormally low T cell receptor excision circle level, and Recurrent viral infections; and very common findings: Decreased total T cell count, Recurrent infections, Severe T-cell immunodeficiency, and Cellular immunodeficiency and others. 47 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Blood and immune system | 14 | Recurrent bronchopulmonary infections, Recurrent viral infections, Recurrent infections |
FOXN1 encodes forkhead box N1 (648 aa). Transcriptional regulator which regulates the development, differentiation, and function of thymic epithelial cells (TECs) both in the prenatal and postnatal thymus. Highest expression in Skin Sun Exposed Lower leg (64.3 TPM) and Skin Not Sun Exposed Suprapubic (58.3 TPM).
Nezelof syndrome is associated with mutations in the FOXN1 gene on chromosome 17.
FOXN1 is classified as a druggable target (Kinase and Transcription Factor categories) with score 0.0.
Genetic testing for FOXN1 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 3 always present features, 6 very common features, 8 common features.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for Nezelof syndrome.
10 publications have been identified in PubMed for Nezelof syndrome. Research spans Case Report / Case Series (30%), Basic Science / Preclinical (30%), and Review / Meta-Analysis (20%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 3 | 30% |
Data assembled from 6 of 12 sources · Last updated Sep 19, 2026, 5:38 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Nezelof syndrome
Lungs and breathing | 6 | Recurrent bronchopulmonary infections, Bronchiectasis, Emphysema |
Digestive system | 6 | Hepatosplenomegaly, Chronic diarrhea, Recurrent infection of the gastrointestinal tract |
Hormones | 2 | Hypothyroidism, Thyroiditis |
Growth and development | 1 | Failure to thrive |
Skin | 1 | Eczematoid dermatitis |
Kidneys and urinary system | 1 | Recurrent urinary tract infections |
Ears | 1 | Chronic otitis media |
Brain and nerves | 1 | Meningitis |
3 |
30% |
Research summaries | 2 | 20% |
Disease patterns and progression | 2 | 20% |
Rips J (2026). [PMID: 41014130](https://pubmed.ncbi.nlm.nih.gov/41014130/). *American journal of medical genetics. Part A*. [Basic Science / Preclinical]
Justiz Vaillant AA (2026). [PMID: 29763203](https://pubmed.ncbi.nlm.nih.gov/29763203/). *Unknown Journal*. [Review / Meta-Analysis]
Gutiérrez-Guerrero A (2026). [PMID: 41826805](https://pubmed.ncbi.nlm.nih.gov/41826805/). *Pediatric allergy and immunology : official publication of the European Society of Pediatric Allergy and Immunology*. [Case Report / Case Series]
Navalpakam A (2026). [PMID: 41905469](https://pubmed.ncbi.nlm.nih.gov/41905469/). *Ann Allergy Asthma Immunol*. [Epidemiology / Natural History]
Xu S (2025). [PMID: 40084689](https://pubmed.ncbi.nlm.nih.gov/40084689/). *Oncology reports*. [Basic Science / Preclinical]
Nzengui-Nzengui GF (2025). [PMID: 40864119](https://pubmed.ncbi.nlm.nih.gov/40864119/). *Tropical medicine and infectious disease*. [Epidemiology / Natural History]
Wysocki CA (2025). [PMID: 40484290](https://pubmed.ncbi.nlm.nih.gov/40484290/). *The Journal of allergy and clinical immunology*. [Case Report / Case Series]
Kumar A (2025). [PMID: 39959339](https://pubmed.ncbi.nlm.nih.gov/39959339/). *Journal of immunology (Baltimore, Md. : 1950)*. [Basic Science / Preclinical]
Kreins AY (2024). [PMID: 39303894](https://pubmed.ncbi.nlm.nih.gov/39303894/). *The Journal of allergy and clinical immunology*. [Review / Meta-Analysis]
Davies N (2024). [PMID: 38841800](https://pubmed.ncbi.nlm.nih.gov/38841800/). *Haematologica*. [Case Report / Case Series]