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Genotype-phenotype correlations in RHOBTB2-associated neurodevelopmental disorders

Langhammer, F; Maroofian, R; Badar, R; Gregor, A; Rochman, M; Ratliff, JB; Koopmans, M; ... Zweier, C; + view all (2023) Genotype-phenotype correlations in RHOBTB2-associated neurodevelopmental disorders. Genetics in Medicine , 25 (8) , Article 100885. 10.1016/j.gim.2023.100885. Green open access

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Abstract

Purpose: Missense variants clustering in the BTB domain region of RHOBTB2 cause a developmental and epileptic encephalopathy with early-onset seizures and severe intellectual disability. Methods: By international collaboration, we assembled individuals with pathogenic RHOBTB2 variants and a variable spectrum of neurodevelopmental disorders. By western blotting, we investigated the consequences of missense variants in vitro. Results: In accordance with previous observations, de novo heterozygous missense variants in the BTB domain region led to a severe developmental and epileptic encephalopathy in 16 individuals. Now, we also identified de novo missense variants in the GTPase domain in 6 individuals with apparently more variable neurodevelopmental phenotypes with or without epilepsy. In contrast to variants in the BTB domain region, variants in the GTPase domain do not impair proteasomal degradation of RHOBTB2 in vitro, indicating different functional consequences. Furthermore, we observed biallelic splice-site and truncating variants in 9 families with variable neurodevelopmental phenotypes, indicating that complete loss of RHOBTB2 is pathogenic as well. Conclusion: By identifying genotype-phenotype correlations regarding location and consequences of de novo missense variants in RHOBTB2 and by identifying biallelic truncating variants, we further delineate and expand the molecular and clinical spectrum of RHOBTB2-related phenotypes, including both autosomal dominant and recessive neurodevelopmental disorders.

Type: Article
Title: Genotype-phenotype correlations in RHOBTB2-associated neurodevelopmental disorders
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.gim.2023.100885
Publisher version: https://doi.org/10.1016/j.gim.2023.100885
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Developmental and epileptic encephalopathy, Intellectual disability, Neurodevelopmental disorder, RHOBTB2, Seizures
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Department of Neuromuscular Diseases
URI: https://discovery.ucl.ac.uk/id/eprint/10173027
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