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@ARTICLE{Li:300827,
author = {T.-F. Li and P. Rothhaar and A. Lang and O. Grünvogel and
O. Colasanti and S. M. O. Ugarte and J. Traut and A. Piras
and N. Acosta-Rivero and V. Gonçalves Magalhães$^*$ and E.
Springer and A. Betz and H.-E. Huang and J. Park$^*$ and R.
Qiu and G. E. Gnouamozi and A.-K. Mehnert and V. L. D. Thi
and S. Urban and M. Muckenthaler and M. Schlesner$^*$ and D.
Wohlleber and M. Binder$^*$ and R. Bartenschlager$^*$ and A.
Pichlmair and V. Lohmann},
title = {{RBM}39 shapes innate immunity by controlling the
expression of key factors of the interferon response.},
journal = {Frontiers in immunology},
volume = {16},
issn = {1664-3224},
address = {Lausanne},
publisher = {Frontiers Media},
reportid = {DKFZ-2025-00941},
pages = {1568056},
year = {2025},
abstract = {The contribution of innate immunity to clearance of viral
infections of the liver, in particular sensing via Toll-like
receptor 3 (TLR3), is incompletely understood. We aimed to
identify the factors contributing to the TLR3 response in
hepatocytes via CRISPR/Cas9 screening.A genome-wide
CRISPR/Cas9 screen on the TLR3 pathway was performed in two
liver-derived cell lines, followed by siRNA knockdown
validation. SiRNA knockdown and indisulam treatment were
used to study the role of RNA-binding motif protein 39
(RBM39) in innate immunity upon poly(I:C) or cytokine
treatment and viral infections. Transcriptome, proteome, and
alternative splicing were studied via RNA sequencing and
mass spectrometry upon depletion of RBM39.Our CRISPR/Cas9
screen identified RBM39, which is highly expressed in
hepatocytes, as an important regulator of the TLR3 pathway.
Knockdown of RBM39 or treatment with indisulam, an aryl
sulfonamide drug targeting RBM39 for proteasomal
degradation, strongly reduced the induction of
interferon-stimulated genes (ISGs) in response to
double-stranded RNA (dsRNA) or viral infections. RNA
sequencing (seq) and mass spectrometry identified that
transcription and/or splicing of the key pathway components
IRF3, RIG-I, and MDA5 were affected by RBM39 depletion,
along with multiple other cellular processes identified
previously. RBM39 knockdown further restrained type I and
type III IFN pathways by reducing the expression of
individual receptor subunits and STAT1/2. The function of
RBM39 was furthermore not restricted to hepatocytes.We
identified RBM39 as a regulatory factor of cell intrinsic
innate immune signaling. Depletion of RBM39 impaired TLR3,
RIG-I/MDA5, and IFN responses by affecting the basal
expression of key pathway components.},
keywords = {RNA-Binding Proteins: genetics / RNA-Binding Proteins:
metabolism / RNA-Binding Proteins: immunology / Immunity,
Innate: genetics / Humans / Toll-Like Receptor 3: metabolism
/ Toll-Like Receptor 3: genetics / Toll-Like Receptor 3:
immunology / Hepatocytes: immunology / Hepatocytes:
metabolism / Signal Transduction / Interferons: immunology /
Interferons: metabolism / Gene Expression Regulation /
CRISPR-Cas Systems / Cell Line / IFNs (Other) / IRF3 (Other)
/ RBM39 (Other) / STAT1 (Other) / STAT2 (Other) / splicing
(Other) / RNA-Binding Proteins (NLM Chemicals) / Toll-Like
Receptor 3 (NLM Chemicals) / Interferons (NLM Chemicals) /
TLR3 protein, human (NLM Chemicals)},
cin = {D430 / W610},
ddc = {610},
cid = {I:(DE-He78)D430-20160331 / I:(DE-He78)W610-20160331},
pnm = {314 - Immunologie und Krebs (POF4-314)},
pid = {G:(DE-HGF)POF4-314},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:40330464},
pmc = {pmc:PMC12054253},
doi = {10.3389/fimmu.2025.1568056},
url = {https://inrepo02.dkfz.de/record/300827},
}