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X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia is a rare combined T and B cell immunodeficiency characterized by recurrent sinopulmonary and viral infections, persistent elevated Epstein-Barr virus (EBV) viremia and increased susceptibility to EBV-associated B-cell lymphoproliferative disorders. Immunological analyzes show normal lymphocyte count or mild to moderate lymphopenia, inverted CD4:CD8 T-cell ratio and hypogammaglobulinemias.
Features include always present findings: Persistent EBV viremia, Decreased CD69 upregulation upon TCR activation, Decreased CD4+ T cell proportion, and Mediastinal lymphadenopathy and others; and common findings: Bronchiectasis and Recurrent respiratory infections. 24 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Blood and immune system | 9 | B-cell lymphoma, Enlarged spleen (splenomegaly), Lymphoproliferative disorder |
Lungs and breathing | 3 | Recurrent bronchitis, Bronchiectasis, Recurrent respiratory infections |
Digestive system | 1 | Enlarged spleen (splenomegaly) |
Ears | 1 | Recurrent otitis media |
Lab test results | 1 | Decreased specific anti-polysaccharide antibody level |
Age of onset: adulthood.
MAGT1 encodes magnesium transporter 1 (335 aa). Accessory component of the STT3B-containing form of the N-oligosaccharyl transferase (OST) complex which catalyzes the transfer of a high mannose oligosaccharide from a lipid-linked oligosaccharide donor to an asparagine residue within an Asn-X-Ser/Thr consensus motif in nascent polypeptide chains. Highest expression in Cells EBV-transformed lymphocytes (52.9 TPM) and Thyroid (52.7 TPM).
X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia is caused by mutations in the MAGT1 gene on chromosome X.
The MAGT1 protein participates in MAGT1 transports Mg2+ from extracellular region to cytosol, TUSC3 transports Mg2+ from extracellular region to cytosol, and SLC41A1,2 transport Mg2+ from extracellular region to cytosol pathways.
MAGT1 is classified as a druggable target (Transporter category) with score 0.0.
Genetic testing for MAGT1 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 16 always present features, 2 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia.
8 publications have been identified in PubMed for X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia. Research spans Case Report / Case Series (50%), Review / Meta-Analysis (25%), and Basic Science / Preclinical (13%).
Kural RF (2026). [PMID: 41899319](https://pubmed.ncbi.nlm.nih.gov/41899319/). *J Clin Med*. [Epidemiology / Natural History]
Wirk B (2026). [PMID: 41871900](https://pubmed.ncbi.nlm.nih.gov/41871900/). *BMJ Case Rep*. [Case Report / Case Series]
Madsen M (2025). [PMID: 41018333](https://pubmed.ncbi.nlm.nih.gov/41018333/). *Cureus*. [Case Report / Case Series]
Del Pino Molina L (2025). [PMID: 40170846](https://pubmed.ncbi.nlm.nih.gov/40170846/). *Front Immunol*. [Basic Science / Preclinical]
Grombirikova H (2025). [PMID: 41141376](https://pubmed.ncbi.nlm.nih.gov/41141376/). *J Immunol Res*. [Case Report / Case Series]
Gutiérrez-Hincapié S (2024). [PMID: 39836832](https://pubmed.ncbi.nlm.nih.gov/39836832/). *Biomedica*. [Case Report / Case Series]
Cao P (2024). [PMID: 39196630](https://pubmed.ncbi.nlm.nih.gov/39196630/). *J Pediatr Hematol Oncol*. [Review / Meta-Analysis]
Golloshi K (2024). [PMID: 38896122](https://pubmed.ncbi.nlm.nih.gov/38896122/). *J Clin Immunol*. [Review / Meta-Analysis]
Data assembled from 7 of 12 sources · Last updated Sep 20, 2026, 5:41 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia