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Effect of amino acid substitutions in the human IFN-γR2 on IFN-γ responsiveness

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Abstract

Patients with interferon-γ receptor (IFN-γR) null mutations have severe infections with poorly pathogenic Mycobacteria. The IFN-γR complex involves two IFN-γR1 and two IFN-γR2 chains, in which several amino acid substitutions, some linked to disease and some apparently naturally occurring, have been described. We developed a model system to study functional effects of genetic variations in IFN-γR2. We retrovirally transduced wild-type IFN-γR2 and IFN-γR2 carrying presently known amino acid substitutions in various human cell lines, and next determined the IFN-γR2 expression pattern as well as IFN-γ responsiveness. We determined that the T58R, Q64R, E147K and K182E variants of IFN-γR2 are fully functional, although the Q64R variant may be expressed higher on the cell membrane. The R114C, T168N and G227R variants were identified in patients that had disseminated infections with non-tuberculous Mycobacteria. Of these genetic variants, T168N was confirmed to be completely non-functional, whereas the novel variant G227R, and the previously reported R114C, were partial functional. The impaired IFN-γ responsiveness of R114C and G227R is mainly due to reduced receptor function, although expression on the cell membrane is reduced as well. We conclude that the T58R, Q64R, E147K and K182E variants are polymorphisms, whereas the R114C, T168N and G227R constitute mutations associated with disease.

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Authors and Affiliations

  1. Department of Infectious Diseases, Leiden University Medical Center, Leiden, The Netherlands

    R A de Paus, J T van Dissel & E van de Vosse

  2. Department of Pediatric Immunology, Uludag University School of Medicine, Bursa, Turkey

    S S Kilic

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  1. R A de Paus
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  2. S S Kilic
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  3. J T van Dissel
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  4. E van de Vosse
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Correspondence to E van de Vosse.

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de Paus, R., Kilic, S., van Dissel, J. et al. Effect of amino acid substitutions in the human IFN-γR2 on IFN-γ responsiveness. Genes Immun 12, 136–144 (2011). https://doi.org/10.1038/gene.2010.74

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