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2018 ; 9
(ä): 1551
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gab.com Text
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English Wikipedia
Epistatic Interactions Between Mutations of Deoxyribonuclease 1-Like 3 and the
Inhibitory Fc Gamma Receptor IIB Result in Very Early and Massive Autoantibodies
Against Double-Stranded DNA
#MMPMID30026744
Weisenburger T
; von Neubeck B
; Schneider A
; Ebert N
; Schreyer D
; Acs A
; Winkler TH
Front Immunol
2018[]; 9
(ä): 1551
PMID30026744
show ga
Autoantibodies against double-stranded DNA (anti-dsDNA) are a hallmark of
systemic lupus erythematosus (SLE). It is well documented that anti-dsDNA
reactive B lymphocytes are normally controlled by immune self-tolerance
mechanisms operating at several levels. The evolution of high levels of IgG
anti-dsDNA in SLE is dependent on somatic hypermutation and clonal selection,
presumably in germinal centers from non-autoreactive B cells. Twin studies as
well as genetic studies in mice indicate a very strong genetic contribution for
the development of anti-dsDNA as well as SLE. Only few single gene defects with a
monogenic Mendelian inheritance have been described so far that are directly
responsible for the development of anti-dsDNA and SLE. Recently, among other
mutations, rare null-alleles for the deoxyribonuclease 1 like 3 (DNASE1L3) and
the Fc gamma receptor IIB (FCGR2B) have been described in SLE patients and
genetic mouse models. Here, we demonstrate that double Dnase1l3- and
FcgR2b-deficient mice in the C57BL/6 background exhibit a very early and massive
IgG anti-dsDNA production. Already at 10?weeks of age, autoantibody production in
double-deficient mice exceeds autoantibody levels of diseased 9-month-old NZB/W
mice, a long established multigenic SLE mouse model. In single gene-deficient
mice, autoantibody levels were moderately elevated at early age of the mice.
Premature autoantibody production was accompanied by a spontaneous
hyperactivation of germinal centers, early expansions of T follicular helper
cells, and elevated plasmablasts in the spleen. Anti-dsDNA hybridomas generated
from double-deficient mice show significantly elevated numbers of arginines in
the CDR3 regions of the heavy-chain as well as clonal expansions and
diversification of B cell clones with moderate numbers of somatic mutations. Our
findings show a strong epistatic interaction of two SLE-alleles which prevent
early and high-level anti-dsDNA autoantibody production. Both genes apparently
synergize to keep in check excessive germinal center reactions evolving into IgG
anti-dsDNA antibody producing B cells.