Biallelic loss-of-function variants in TBC1D2B cause a neurodevelopmental disorder with seizures and gingival overgrowth.
Rab5
Ramon syndrome
apoptosis
cherubism
endosomal trafficking
Journal
Human mutation
ISSN: 1098-1004
Titre abrégé: Hum Mutat
Pays: United States
ID NLM: 9215429
Informations de publication
Date de publication:
09 2020
09 2020
Historique:
received:
23
01
2020
revised:
08
06
2020
accepted:
30
06
2020
pubmed:
6
7
2020
medline:
11
11
2021
entrez:
6
7
2020
Statut:
ppublish
Résumé
The family of Tre2-Bub2-Cdc16 (TBC)-domain containing GTPase activating proteins (RABGAPs) is not only known as key regulatorof RAB GTPase activity but also has GAP-independent functions. Rab GTPases are implicated in membrane trafficking pathways, such as vesicular trafficking. We report biallelic loss-of-function variants in TBC1D2B, encoding a member of the TBC/RABGAP family with yet unknown function, as the underlying cause of cognitive impairment, seizures, and/or gingival overgrowth in three individuals from unrelated families. TBC1D2B messenger RNA amount was drastically reduced, and the protein was absent in fibroblasts of two patients. In immunofluorescence analysis, ectopically expressed TBC1D2B colocalized with vesicles positive for RAB5, a small GTPase orchestrating early endocytic vesicle trafficking. In two independent TBC1D2B CRISPR/Cas9 knockout HeLa cell lines that serve as cellular model of TBC1D2B deficiency, epidermal growth factor internalization was significantly reduced compared with the parental HeLa cell line suggesting a role of TBC1D2B in early endocytosis. Serum deprivation of TBC1D2B-deficient HeLa cell lines caused a decrease in cell viability and an increase in apoptosis. Our data reveal that loss of TBC1D2B causes a neurodevelopmental disorder with gingival overgrowth, possibly by deficits in vesicle trafficking and/or cell survival.
Substances chimiques
GTPase-Activating Proteins
0
TBC1D2 protein, human
0
Types de publication
Case Reports
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1645-1661Informations de copyright
© 2020 Wiley Periodicals LLC.
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