Rubella vaccine–induced granulomas are a novel phenotype with incomplete penetrance of genetic defects in cytotoxicity - 05/01/22
Abstract |
Background |
Rubella virus–induced granulomas have been described in patients with various inborn errors of immunity. Most defects impair T-cell immunity, suggesting a critical role of T cells in rubella elimination. However, the molecular mechanism of virus control remains elusive.
Objective |
This study sought to understand the defective effector mechanism allowing rubella vaccine virus persistence in granulomas.
Methods |
Starting from an index case with Griscelli syndrome type 2 and rubella skin granulomas, this study combined an international survey with a literature search to identify patients with cytotoxicity defects and granuloma. The investigators performed rubella virus immunohistochemistry and PCR and T-cell migration assays.
Results |
This study identified 21 patients with various genetically confirmed cytotoxicity defects, who presented with skin and visceral granulomas. Rubella virus was demonstrated in all 12 accessible biopsies. Granuloma onset was typically before 2 years of age and lesions persisted from months to years. Granulomas were particularly frequent in MUNC13-4 and RAB27A deficiency, where 50% of patients at risk were affected. Although these proteins have also been implicated in lymphocyte migration, 3-dimensional migration assays revealed no evidence of impaired migration of patient T cells. Notably, patients showed no evidence of reduced control of concomitantly given measles, mumps, or varicella live-attenuated vaccine or severe infections with other viruses.
Conclusions |
This study identified lymphocyte cytotoxicity as a key effector mechanism for control of rubella vaccine virus, without evidence for its need in control of live measles, mumps, or varicella vaccines. Rubella vaccine–induced granulomas are a novel phenotype with incomplete penetrance of genetic disorders of cytotoxicity.
Le texte complet de cet article est disponible en PDF.Key words : Cytotoxicity, rubella virus, live vaccine, granuloma, primary immunodeficiency, hemophagocytic lymphohistiocytosis, Griscelli syndrome type 2
Abbreviations used : 3D, AT, CHS, fHLH, GS2, HLH, HSCT, IEI, MMR, NK, P1, RV
Plan
M.G., A.M., K.G., B.V.K., A.S.G., and S.E. were supported by the Deutsche Forschungsgemeinschaft (SFB1160, TP A1 and Z1). This work was further supported by the Deutsche Kinderkrebsstiftung (DKS 2016.04 and DKS 2018.11). T.G.C. was supported by the French State funding from the Agence Nationale de la Recherche under “Investissements d’avenir” program (ANR-10-IAHU-01) and the “Fondation Bettencourt Schueller.” J.M.H. was financially supported by the Grand Duchy of Luxembourg through the Ministries of Health and of Higher Education and Research. |
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Disclosure of potential conflict of interest: A. Fasth received personal fees outside the submitted work from Lipum as member of the advisory board. S. Ehl received a research grant from UCB outside the submitted work. The rest of the authors declare that they have no relevant conflicts of interest. |
Vol 149 - N° 1
P. 388 - janvier 2022 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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