Partial IFN-γR2 deficiency is due to protein misfolding and can be rescued by inhibitors of glycosylation

Marcela Moncada-Vélez, Rubén Martinez-Barricarte, Dusan Bogunovic, Xiao Fei Kong, Lizbeth Blancas-Galicia, Cengiz Tirpan, Guzide Aksu, Quentin B. Vincent, Bertrand Boisson, Yuval Itan, Noé Ramírez-Alejo, Satoshi Okada, Alexandra Y. Kreins, Vanessa L. Bryant, Jose Luis Franco, Mélanie Migaud, Sara Espinosa-Padilla, Marco Yamazaki-Nakashimada, Francisco Espinosa-Rosales, Necil KutukculerLaurent Abel, Jacinta Bustamante, Guillaume Vogt, Jean Laurent Casanova, Stéphanie Boisson-Dupuis

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

We report a molecular study of the two known patients with autosomal recessive, partial interferon-γ receptor (IFN-γR)2 deficiency (homozygous for mutations R114C and G227R), and three novel, unrelated children, homozygous for S124F (P1) and G141R (P2 and P3). IFN-γR2 levels on the surface of the three latter patients' cells are slightly lower than those on control cells. The patients' cells also display impaired, but not abolished, response to IFN-γ. Moreover, the R114C, S124F, G141R and G227R IFNGR2 hypomorphic alleles all encode misfolded proteins with abnormal N-glycosylation. The mutants are largely retained in the endoplasmic reticulum, although a small proportion reach and function at the cell surface. Strikingly, the IFN-γ response of the patients' cells is enhanced by chemical modifiers of N-glycosylation, as previously shown for patients with gain-of-glysosylation T168N and misfolding 382-387dup null mutations. All four in-frame IFNGR2 hypomorphic mutant alleles encoding surface-expressed receptors are thus deleterious by a mechanism involving abnormal N-glycosylation and misfolding of the IFN-γR2 protein. The diagnosis of partial IFN-γR2 deficiency is clinically useful, as affected patients should be treated with IFN-, unlike patients with complete IFN-γR2 deficiency. Moreover, inhibitors of glycosylation might be beneficial in patients with complete or partial IFN-γR2 deficiency due to misfolding or gain-of-glycosylation receptors.

Original languageEnglish (US)
Pages (from-to)2390-2401
Number of pages12
JournalBlood
Volume122
Issue number14
DOIs
StatePublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology

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