Omenn syndrome

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Omenn syndrome
Classification and external resources
ICD-10 D81.2 (ILDS D81.210)
OMIM 603554
DiseasesDB 32676
eMedicine ped/1640

Omenn syndrome is an autosomal recessive severe combined immunodeficiency[1] associated with mutations in the recombination activating genes (RAG1 and RAG2), affecting circulating levels of both B-cells and T-cells.


Redness and scaliness of the entire skin on a 5-month-old female infant
Omenn syndrome

The symptoms are very similar to graft-versus-host disease (GVHD). This is because the patients have some T cells with limited levels of recombination with the mutant RAG genes. These T cells are abnormal and have a very specific affinity for self antigens found in the thymus and in the periphery. Therefore, these T cells are auto-reactive and cause the GVHD phenotype.

Symptoms include:


Omenn syndrome has an autosomal recessive pattern of inheritance.


Omenn syndrome is sometimes treated with bone marrow transplantation and cord blood stem cells.

See also[edit]


  1. ^ Santagata S, Villa A, Sobacchi C, Cortes P, Vezzoni P (2000). "The genetic and biochemical basis of Omenn syndrome". Immunol Rev. 178: 64–74. doi:10.1034/j.1600-065X.2000.17818.x. PMID 11213808.