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  • A form of combined T and B cell immunodeficiency with characteristics of severe and persistent cytomegalovirus infection and autoimmune cytopenia. Patients present before the age of one year with severe disseminated cytomegalovirus infection, which can manifest with fever and splenomegaly, and recurrent and severe co-infections including sepsis and pneumonitis. Caused by hypomorphic mutation in the RAG1 gene (11p13). This results in oligoclonal expansion of T cell receptor (TCR) gamma-delta T cells and TCR alpha-beta T cell lymphopenia. Transmission is autosomal recessive.
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