Journal
NATURE GENETICS
Volume 48, Issue 4, Pages 457-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ng.3512
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Funding
- US National Institutes of Health [DK076683]
- Max Planck Society
- National Research Foundation of Korea, Ministry of Science, ICT and Future planning [2015R1D1A1A01056685]
- Yonsei University College of Medicine [2015-32-0047]
- ASN Foundation for Kidney Research
- European Community [2012-305608]
- Hacettepe University Infrastructure Project [06A101008]
- Howard Hughes Medical Institute
- Doris Duke Charitable Foundation
- Warren E. Grupe Professorship
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Nucleoporins are essential components of the nuclear pore complex (NPC)(1). Only a few diseases have been attributed to NPC dysfunction(2-4). Steroid-resistant nephrotic syndrome (SRNS), a frequent cause of chronic kidney disease, is caused by dysfunction of glomerular podocytes(5). Here we identify in eight families with SRNS mutations in NUP93, its interaction partner NUP205 or XPO5 (encoding exportin 5) as hitherto unrecognized monogenic causes of SRNS. NUP93 mutations caused disrupted NPC assembly. NUP93 knockdown reduced the presence of NUP205 in the NPC, and, reciprocally, a NUP205 alteration abrogated NUP93 interaction. We demonstrate that NUP93 and exportin 5 interact with the signaling protein SMAD4 and that NUP93 mutations abrogated interaction with SMAD4. Notably, NUP93 mutations interfered with BMP7-induced SMAD transcriptional reporter activity. We hereby demonstrate that mutations of NUP genes cause a distinct renal disease and identify aberrant SMAD signaling as a new disease mechanism of SRNS, opening a potential new avenue for treatment.
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