Bi-allelic LoF NRROS Variants Impairing Active TGF-β1 Delivery Cause a Severe Infantile-Onset Neurodegenerative Condition with Intracranial Calcification.
NRROS
TGF-β1
intracranial calcification
mutation
neurodegeneration
neuroinflammation
Journal
American journal of human genetics
ISSN: 1537-6605
Titre abrégé: Am J Hum Genet
Pays: United States
ID NLM: 0370475
Informations de publication
Date de publication:
02 04 2020
02 04 2020
Historique:
received:
25
12
2019
accepted:
26
02
2020
pubmed:
21
3
2020
medline:
12
5
2020
entrez:
21
3
2020
Statut:
ppublish
Résumé
Negative regulator of reactive oxygen species (NRROS) is a leucine-rich repeat-containing protein that uniquely associates with latent transforming growth factor beta-1 (TGF- β1) and anchors it on the cell surface; this anchoring is required for activation of TGF-β1 in macrophages and microglia. We report six individuals from four families with bi-allelic variants in NRROS. All affected individuals had neurodegenerative disease with refractory epilepsy, developmental regression, and reduced white matter volume with delayed myelination. The clinical course in affected individuals began with normal development or mild developmental delay, and the onset of seizures occurred within the first year of life, followed by developmental regression. Intracranial calcification was detected in three individuals. The phenotypic features in affected individuals are consistent with those observed in the Nrros knockout mouse, and they overlap with those seen in the human condition associated with TGF-β1 deficiency. The disease-causing NRROS variants involve two significant functional NRROS domains. These variants result in aberrant NRROS proteins with impaired ability to anchor latent TGF-β1 on the cell surface. Using confocal microscopy in HEK293T cells, we demonstrate that wild-type and mutant NRROS proteins co-localize with latent TGF-β1 intracellularly. However, using flow cytometry, we show that our mutant NRROS proteins fail to anchor latent TGF-β1 at the cell surface in comparison to wild-type NRROS. Moreover, wild-type NRROS rescues the defect of our disease-associated mutants in presenting latent TGF-β1 to the cell surface. Taken together, our findings suggest that loss of NRROS function causes a severe childhood-onset neurodegenerative condition with features suggestive of a disordered response to inflammation.
Identifiants
pubmed: 32197075
pii: S0002-9297(20)30056-2
doi: 10.1016/j.ajhg.2020.02.014
pmc: PMC7118692
pii:
doi:
Substances chimiques
Latent TGF-beta Binding Proteins
0
NRROS protein, human
0
TGFB1 protein, human
0
Transforming Growth Factor beta1
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
559-569Informations de copyright
Crown Copyright © 2020. Published by Elsevier Inc. All rights reserved.
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