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@ARTICLE{Kampf:614406,
author = {Kampf, Lina L. and Schneider, Ronen and Gerstner, Lea and
Thünauer, Roland and Chen, Mengmeng and Helmstädter,
Martin and Amar, Ali and Onuchic-Whitford, Ana C. and Loza
Munarriz, Reyner and Berdeli, Afig and Müller, Dominik and
Schrezenmeier, Eva and Budde, Klemens and Mane, Shrikant and
Laricchia, Kristen M. and Rehm, Heidi L. and MacArthur,
Daniel G. and Lifton, Richard P. and Walz, Gerd and Römer,
Winfried and Bergmann, Carsten and Hildebrandt, Friedhelm
and Hermle, Tobias},
title = {{TBC}1{D}8{B} {M}utations {I}mplicate {RAB}11-{D}ependent
{V}esicular {T}rafficking in the {P}athogenesis of
{N}ephrotic {S}yndrome},
journal = {Journal of the American Society of Nephrology},
volume = {30},
number = {12},
issn = {1046-6673},
address = {[Erscheinungsort nicht ermittelbar]},
publisher = {Ovid},
reportid = {PUBDB-2024-05873},
pages = {2338 - 2353},
year = {2019},
note = {This research was supported by grants from the Deutsche
Forschungsgemeinschaft to Dr. Hermle (HE 7456/3-1) . Dr.
Bergmann acknowledges support from the Deutsche
Forschungsgemeinschaft Collaborative Research Centre (KIDGEM
1140) and the Federal Ministry of Education and Research
(01GM1515C).},
abstract = {AbstractSignificance Statement The discovery of monogenic
causes of nephrotic syndrome led to insights about the role
of podocytes and the slit diaphragm in the pathogenesis of
the disease. The authors describe novel mutations in TBC1D8B
in five families with steroid-resistant nephrotic syndrome.
TBC1D8B binds to active RAB11A and RAB11B. Silencing TBC1D8B
leads to upregulation of RAB11-dependent processes
suggesting TBC1D8B inhibits RAB11. TBC1D8B also interacts
and colocalizes with the slit diaphragm protein nephrin.
Silencing TBC1D8B in podocyte-like Drosophila nephrocytes
causes mistrafficking of fly nephrin. Nephrin trafficking in
Drosophila requires Rab11, whereas overexpression of Rab11
causes a similar phenotype as TBC1D8B silencing. These
findings implicate regulation of RAB11-dependent vesicular
trafficking by TBC1D8B as a novel pathogenetic pathway in
nephrotic syndrome.Background Mutations in about 50 genes
have been identified as monogenic causes of nephrotic
syndrome, a frequent cause of CKD. These genes delineated
the pathogenetic pathways and rendered significant insight
into podocyte biology.Methods We used whole-exome sequencing
to identify novel monogenic causes of steroid-resistant
nephrotic syndrome (SRNS). We analyzed the functional
significance of an SRNS-associated gene in vitro and in
podocyte-like Drosophila nephrocytes.Results We identified
hemizygous missense mutations in the gene TBC1D8B in five
families with nephrotic syndrome. Coimmunoprecipitation
assays indicated interactions between TBC1D8B and active
forms of RAB11. Silencing TBC1D8B in HEK293T cells increased
basal autophagy and exocytosis, two cellular functions that
are independently regulated by RAB11. This suggests that
TBC1D8B plays a regulatory role by inhibiting endogenous
RAB11. Coimmunoprecipitation assays showed TBC1D8B also
interacts with the slit diaphragm protein nephrin, and
colocalizes with it in immortalized cell lines.
Overexpressed murine Tbc1d8b with patient-derived mutations
had lower affinity for endogenous RAB11 and nephrin compared
with wild-type Tbc1d8b protein. Knockdown of Tbc1d8b in
Drosophila impaired function of the podocyte-like
nephrocytes, and caused mistrafficking of Sns, the
Drosophila ortholog of nephrin. Expression of Rab11 RNAi in
nephrocytes entailed defective delivery of slit diaphragm
protein to the membrane, whereas RAB11 overexpression
revealed a partial phenotypic overlap to Tbc1d8b loss of
function.Conclusions Novel mutations in TBC1D8B are
monogenic causes of SRNS. This gene inhibits RAB11. Our
findings suggest that RAB11-dependent vesicular nephrin
trafficking plays a role in the pathogenesis of nephrotic
syndrome.},
cin = {CSSB-CF-ALFM},
ddc = {610},
cid = {I:(DE-H253)CSSB-CF-ALFM-20210629},
pnm = {899 - ohne Topic (POF4-899) / DFG project
G:(GEPRIS)39236281 - EXC 294: BIOSS Zentrum für Biologische
Signalstudien - von der Analyse zur Synthese (39236281)},
pid = {G:(DE-HGF)POF4-899 / G:(GEPRIS)39236281},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31732614},
UT = {WOS:000508269600010},
doi = {10.1681/ASN.2019040414},
url = {https://bib-pubdb1.desy.de/record/614406},
}