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  • A genetic variant of mendelian susceptibility to mycobacterial diseases (MSMD) with characteristics of a partial deficiency in IFN-gammaR2, leading to a residual response to IFN-gamma and consequently to recurrent, moderately severe infections with bacillus Calmette-GuĂ©rin (BCG) and other environmental mycobacteria. Only one patient has been reported with this variant to date. Caused by a homozygous mutation (R114C) in IFNGR2 on chromosome 21q22.1-22.2 that encodes the IFN-gamma receptor ligand binding chain. This mutation leads to a residual cellular response to IFN-gamma in terms of IL12p40 production. Transmission is autosomal recessive.
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