Lookup NU author(s): Professor Sophie Hambleton
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© 2018, The Author(s). Human inborn errors of IFN-γ immunity underlie mycobacterial diseases. We describe patients with Mycobacterium bovis (BCG) disease who are homozygous for loss-of-function mutations of SPPL2A. This gene encodes a transmembrane protease that degrades the N-terminal fragment (NTF) of CD74 (HLA invariant chain) in antigen-presenting cells. The CD74 NTF therefore accumulates in the HLA class II+ myeloid and lymphoid cells of SPPL2a-deficient patients. This toxic fragment selectively depletes IL-12- and IL-23-producing CD1c+ conventional dendritic cells (cDC2s) and their circulating progenitors. Moreover, SPPL2a-deficient memory TH1* cells selectively fail to produce IFN-γ when stimulated with mycobacterial antigens in vitro. Finally, Sppl2a–/– mice lack cDC2s, have CD4+ T cells that produce small amounts of IFN-γ after BCG infection, and are highly susceptible to infection with BCG or Mycobacterium tuberculosis. These findings suggest that inherited SPPL2a deficiency in humans underlies mycobacterial disease by decreasing the numbers of cDC2s and impairing IFN-γ production by mycobacterium-specific memory TH1* cells.
Author(s): Kong X-F, Martinez-Barricarte R, Kennedy J, Mele F, Lazarov T, Deenick EK, Ma CS, Breton G, Lucero KB, Langlais D, Bousfiha A, Aytekin C, Markle J, Trouillet C, Jabot-Hanin F, Arlehamn CSL, Rao G, Picard C, Lasseau T, Latorre D, Hambleton S, Deswarte C, Itan Y, Abarca K, Moraes-Vasconcelos D, Ailal F, Ikinciogullari A, Dogu F, Benhsaien I, Sette A, Abel L, Boisson-Dupuis S, Schroder B, Nussenzweig MC, Liu K, Geissmann F, Tangye SG, Gros P, Sallusto F, Bustamante J, Casanova J-L
Publication type: Article
Publication status: Published
Journal: Nature Immunology
Print publication date: 01/09/2018
Online publication date: 20/08/2018
Acceptance date: 02/07/2018
ISSN (print): 1529-2908
ISSN (electronic): 1529-2916
Publisher: Nature Publishing Group
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