Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/133025
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Type: Journal article
Title: Recurrent de novo missense variants in GNB2 can cause syndromic intellectual disability
Author: Tan, N.B.
Pagnamenta, A.T.
Ferla, M.P.
Gadian, J.
Chung, B.H.Y.
Chan, M.C.Y.
Fung, J.L.F.
Cook, E.
Guter, S.
Boschann, F.
Heinen, A.
Schallner, J.
Mignot, C.
Keren, B.
Whalen, S.
Sarret, C.
Mittag, D.
Demmer, L.
Stapleton, R.
Saida, K.
et al.
Citation: Journal of Medical Genetics, 2022; 59(5):511-516
Publisher: BMJ Publishing
Issue Date: 2022
ISSN: 0022-2593
1468-6244
Statement of
Responsibility: 
Natalie B Tan ... Christopher P Barnett ... Hamish S Scott ... et al.
Abstract: Purpose: Binding proteins (G-proteins) mediate signalling pathways involved in diverse cellular functions and comprise Gα and Gβγ units. Human diseases have been reported for all five Gβ proteins. A de novo missense variant in GNB2 was recently reported in one individual with developmental delay/intellectual disability (DD/ID) and dysmorphism. We aim to confirm GNB2 as a neurodevelopmental disease gene, and elucidate the GNB2-associated neurodevelopmental phenotype in a patient cohort. Methods: We discovered a GNB2 variant in the index case via exome sequencing and sought individuals with GNB2 variants via international data-sharing initiatives. In silico modelling of the variants was assessed, along with multiple lines of evidence in keeping with American College of Medical Genetics and Genomics guidelines for interpretation of sequence variants. Results: We identified 12 unrelated individuals with five de novo missense variants in GNB2, four of which are recurrent: p.(Ala73Thr), p.(Gly77Arg), p.(Lys89Glu) and p.(Lys89Thr). All individuals have DD/ID with variable dysmorphism and extraneurologic features. The variants are located at the universally conserved shared interface with the Gα subunit, which modelling suggests weaken this interaction. Conclusion: Missense variants in GNB2 cause a congenital neurodevelopmental disorder with variable syndromic features, broadening the spectrum of multisystem phenotypes associated with variants in genes encoding G-proteins.
Keywords: G-beta protein; GNB2, developmental delay; intellectual disability
Description: First published June 28, 2021. Online issue publication April 22, 2022.
Rights: © Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.
DOI: 10.1136/jmedgenet-2020-107462
Grant ID: http://purl.org/au-research/grants/nhmrc/2005458
http://purl.org/au-research/grants/nhmrc/1079342
http://purl.org/au-research/grants/nhmrc/1123341
http://purl.org/au-research/grants/nhmrc/GNT1113531
Published version: http://dx.doi.org/10.1136/jmedgenet-2020-107462
Appears in Collections:Medicine publications

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