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Mycobacterial Disease and Impaired IFN-γ Immunity in Humans with Inherited ISG15 Deficiency

by: Dusan Bogunovic, Minji Byun, Larissa A. Durfee, Avinash Abhyankar, Ozden Sanal, Davood Mansouri, Sandra Salem, Irena Radovanovic, Audrey V. Grant, Parisa Adimi, Nahal Mansouri, Satoshi Okada, Vanessa L. Bryant, Xiao-Fei Kong, Alexandra Kreins, Marcela M. Velez, Bertrand Boisson, Soheila Khalilzadeh, Ugur Ozcelik, Ilad A. Darazam, John W. Schoggins, Charles M. Rice, Saleh Al-Muhsen, Marcel Behr, Guillaume Vogt, Anne Puel, Jacinta Bustamante, Philippe Gros, Jon M. Huibregtse, Laurent Abel, Stéphanie Boisson-Dupuis, Jean-Laurent Casanova
Science (02 August 2012), doi:10.1126/science.1224026  Key: citeulike:11003925

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Abstract

ISG15 is an interferon (IFN)-α/β-inducible, ubiquitin-like intracellular protein. Its conjugation to various proteins (ISGylation) contributes to antiviral immunity in mice. We describe human patients with inherited ISG15 deficiency and mycobacterial, but not viral diseases. The lack of intracellular ISG15 production and protein ISGylation was not associated with cellular susceptibility to any viruses tested, consistent with the lack of viral diseases in these patients. By contrast, the lack of mycobacterium-induced ISG15 secretion by leukocytes—granulocytes in particular—reduced the production of IFN-γ by lymphocytes, including natural killer cells, probably accounting for the enhanced susceptibility to mycobacterial disease. This experiment of nature shows that human ISGylation is largely redundant for antiviral immunity, but that ISG15 plays an essential role as an IFN-γ–inducing secreted molecule for optimal antimycobacterial immunity.


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