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2014 ; 124
(12
): 1894-904
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Functional characterization of the human dendritic cell immunodeficiency
associated with the IRF8(K108E) mutation
#MMPMID25122610
Salem S
; Langlais D
; Lefebvre F
; Bourque G
; Bigley V
; Haniffa M
; Casanova JL
; Burk D
; Berghuis A
; Butler KM
; Leahy TR
; Hambleton S
; Gros P
Blood
2014[Sep]; 124
(12
): 1894-904
PMID25122610
show ga
We have previously reported on a unique patient in whom homozygosity for a
mutation at IRF8 (IRF8(K108E)) causes a severe immunodeficiency. Laboratory
evaluation revealed a highly unusual myeloid compartment, remarkable for the
complete absence of CD141 and CD161 monocytes, absence of CD11c1 conventional
dendritic cells (DCs) and CD11c1/CD1231 plasmacytoid DCs, and striking
granulocytic hyperplasia. The patient initially presented with severe
disseminated mycobacterial and mucocutaneous fungal infections and was ultimately
cured by cord blood transplant. Sequencing RNA from the IRF8(K108E) patient's
primary blood cells prior to transplant shows not only depletion of IRF8-bound
and IRF8-regulated transcriptional targets, in keeping with the distorted
composition of the myeloid compartment, but also a paucity of transcripts
associated with activated CD41 and CD81 T lymphocytes. This suggests that T cells
reared in the absence of a functional antigen-presenting compartment in
IRF8(K108E) are anergic. Biochemical characterization of the IRF8(K108E) mutant
in vitro shows that loss of the positively charged side chain at K108 causes loss
of nuclear localization and loss of transcriptional activity, which is
concomitant with decreased protein stability, increased ubiquitination, increased
small ubiquitin-like modification, and enhanced proteasomal degradation. These
findings provide functional insight into the molecular basis of immunodeficiency
associated with loss of IRF8.