Alessandra Rossi, Susan X N Lin, Nathan L Absalom, Sebastian Ortiz-De la Rosa, Vivian W Y Liao, Nazanin A Mohammadi, Sindhu Viswanathan, Tommy Stödberg, Alberto Danieli, Paolo Bonanni, Alec Aeby, Alessandro Orsini, Alice Bonuccelli, Andrea Rüegger, Beatriz G Giraldez, Bertrand Isidor, Burkhard Stüve, Carla Marini, Elisabetta Cesaroni, Christina D Fenger, Christophe Philippe, Colombine Meunier, Damien Lederer, Stéphanie Moortgat, Egidio Spinelli, Elisa Fallica, Fiona Zeiner, Matthias Bauman, Laura Licchetta, Francesca Bisulli, Francesca F Operto, Ira Benkel-Herrenbrueck, Kathleen M Gorman, Katrine M Johannesen, Konrad Platzer, Franziska Schnabel, Lieven Lagae, Mirjam Laufs, Riina Zordania, Stephen Malone, Tullio Messana, Wendy Werckx, Charlotta Jonsson, Zaid Afawi, Thomas Foiadelli, Yosra Halleb, Radka Stoeva, Mélanie Jennesson-Lyver, Gaetan Lesca, Renzo Guerrini, Samuel F Berkovic, Ingrid E Scheffer, Mary Chebib, Elena Gardella, Rikke S Møller, Guido Rubboli, Philip K Ahring
{"title":"Phenotypic Spectrum in Individuals With Pathogenic <i>GABRG2</i> Loss- and Gain-of-Function Variants.","authors":"Alessandra Rossi, Susan X N Lin, Nathan L Absalom, Sebastian Ortiz-De la Rosa, Vivian W Y Liao, Nazanin A Mohammadi, Sindhu Viswanathan, Tommy Stödberg, Alberto Danieli, Paolo Bonanni, Alec Aeby, Alessandro Orsini, Alice Bonuccelli, Andrea Rüegger, Beatriz G Giraldez, Bertrand Isidor, Burkhard Stüve, Carla Marini, Elisabetta Cesaroni, Christina D Fenger, Christophe Philippe, Colombine Meunier, Damien Lederer, Stéphanie Moortgat, Egidio Spinelli, Elisa Fallica, Fiona Zeiner, Matthias Bauman, Laura Licchetta, Francesca Bisulli, Francesca F Operto, Ira Benkel-Herrenbrueck, Kathleen M Gorman, Katrine M Johannesen, Konrad Platzer, Franziska Schnabel, Lieven Lagae, Mirjam Laufs, Riina Zordania, Stephen Malone, Tullio Messana, Wendy Werckx, Charlotta Jonsson, Zaid Afawi, Thomas Foiadelli, Yosra Halleb, Radka Stoeva, Mélanie Jennesson-Lyver, Gaetan Lesca, Renzo Guerrini, Samuel F Berkovic, Ingrid E Scheffer, Mary Chebib, Elena Gardella, Rikke S Møller, Guido Rubboli, Philip K Ahring","doi":"10.1212/WNL.0000000000213644","DOIUrl":null,"url":null,"abstract":"<p><strong>Background and objectives: </strong>Variants in the <i>GABRG2</i> gene encoding the γ2 subunit of the γ-aminobutyric acid type A (GABA<sub>A</sub>) receptor are associated with a spectrum of epilepsy phenotypes. These range from simple febrile seizures to more severe conditions, including developmental and epileptic encephalopathies (DEEs). Despite previous analyses suggesting that pathogenic variants may lead to loss-of-function (LoF) receptors, a correlation between functional analysis and clinical phenotypic diversity remains elusive. We, therefore, aimed to determine why variants in the <i>GABRG2</i> gene can lead to highly diverse phenotypes.</p><p><strong>Methods: </strong>We assembled a cohort of unreported probands carrying presumed pathogenic <i>GABRG2</i> variants. Electroclinical information was systematically collected, and electrophysiologic measurements were conducted for missense variants to explore potential alterations in receptor function.</p><p><strong>Results: </strong>We examined 44 individuals with 35 <i>GABRG2</i> variants (18 null and 17 missense). Functional assessments of the missense variants revealed that 9 caused LoF and 3 caused gain-of-function (GoF). The remaining 5 did not alter receptor function and are likely not pathogenic. Based on functional analysis and electroclinical data, 37 affected individuals were categorized into 3 groups: null LoF, missense LoF, and GoF variants. Among 19 individuals with null variants, epilepsy was diagnosed in 13, with a median onset of 14 months. The remaining 6 of 19 only had febrile seizures. Developmental delay/intellectual disability (DD/ID) was observed in 1 of 19 and psychiatric features in 4 of 18. By contrast, all 12 individuals with missense LoF variants suffered from epilepsy with a median onset of 15 months. Most common epilepsy diagnoses were febrile seizures plus in 4 of 12 and DEE in 4 of 12. DD/ID affected 9 of 12, and psychiatric features were diagnosed in 8 of 12. Statistical comparisons revealed that null variants were associated with a milder phenotype than missense LoF variants. Finally, 5 of 6 individuals with GoF variants had DEE characterized by early infancy onset at 2 months and severe/profound DD/ID. The sixth individual exhibited mild DD/ID and hypotonia without seizures.</p><p><strong>Discussion: </strong>Our findings indicate that the severity of disease associated with pathogenic <i>GABRG2</i> variants depends on the functional consequences of the variants. Null variants are associated with a mild phenotype and missense LoF variants with an intermediate phenotype while GoF variants can lead to severe phenotypes.</p>","PeriodicalId":19256,"journal":{"name":"Neurology","volume":"105 2","pages":"e213644"},"PeriodicalIF":7.7000,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12202131/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Neurology","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1212/WNL.0000000000213644","RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/6/26 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"CLINICAL NEUROLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Background and objectives: Variants in the GABRG2 gene encoding the γ2 subunit of the γ-aminobutyric acid type A (GABAA) receptor are associated with a spectrum of epilepsy phenotypes. These range from simple febrile seizures to more severe conditions, including developmental and epileptic encephalopathies (DEEs). Despite previous analyses suggesting that pathogenic variants may lead to loss-of-function (LoF) receptors, a correlation between functional analysis and clinical phenotypic diversity remains elusive. We, therefore, aimed to determine why variants in the GABRG2 gene can lead to highly diverse phenotypes.
Methods: We assembled a cohort of unreported probands carrying presumed pathogenic GABRG2 variants. Electroclinical information was systematically collected, and electrophysiologic measurements were conducted for missense variants to explore potential alterations in receptor function.
Results: We examined 44 individuals with 35 GABRG2 variants (18 null and 17 missense). Functional assessments of the missense variants revealed that 9 caused LoF and 3 caused gain-of-function (GoF). The remaining 5 did not alter receptor function and are likely not pathogenic. Based on functional analysis and electroclinical data, 37 affected individuals were categorized into 3 groups: null LoF, missense LoF, and GoF variants. Among 19 individuals with null variants, epilepsy was diagnosed in 13, with a median onset of 14 months. The remaining 6 of 19 only had febrile seizures. Developmental delay/intellectual disability (DD/ID) was observed in 1 of 19 and psychiatric features in 4 of 18. By contrast, all 12 individuals with missense LoF variants suffered from epilepsy with a median onset of 15 months. Most common epilepsy diagnoses were febrile seizures plus in 4 of 12 and DEE in 4 of 12. DD/ID affected 9 of 12, and psychiatric features were diagnosed in 8 of 12. Statistical comparisons revealed that null variants were associated with a milder phenotype than missense LoF variants. Finally, 5 of 6 individuals with GoF variants had DEE characterized by early infancy onset at 2 months and severe/profound DD/ID. The sixth individual exhibited mild DD/ID and hypotonia without seizures.
Discussion: Our findings indicate that the severity of disease associated with pathogenic GABRG2 variants depends on the functional consequences of the variants. Null variants are associated with a mild phenotype and missense LoF variants with an intermediate phenotype while GoF variants can lead to severe phenotypes.
期刊介绍:
Neurology, the official journal of the American Academy of Neurology, aspires to be the premier peer-reviewed journal for clinical neurology research. Its mission is to publish exceptional peer-reviewed original research articles, editorials, and reviews to improve patient care, education, clinical research, and professionalism in neurology.
As the leading clinical neurology journal worldwide, Neurology targets physicians specializing in nervous system diseases and conditions. It aims to advance the field by presenting new basic and clinical research that influences neurological practice. The journal is a leading source of cutting-edge, peer-reviewed information for the neurology community worldwide. Editorial content includes Research, Clinical/Scientific Notes, Views, Historical Neurology, NeuroImages, Humanities, Letters, and position papers from the American Academy of Neurology. The online version is considered the definitive version, encompassing all available content.
Neurology is indexed in prestigious databases such as MEDLINE/PubMed, Embase, Scopus, Biological Abstracts®, PsycINFO®, Current Contents®, Web of Science®, CrossRef, and Google Scholar.