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Rare genetic variants in ARID2 are responsible for a recently described neurodevelopmental condition called ARID2-related disorder (ARID2-RD). ARID2 belongs to PBAF, a unit of the SWI/SNF complex, which is a chromatin remodeling complex. This work aims to further delineate the phenotypic spectrum of ARID2-RD, providing clinicians with additional data for better care and aid in the future diagnosis of this condition.
Rare genetic variants in ARID2 are responsible for a recently described neurodevelopmental condition called ARID2-related disorder (ARID2-RD). ARID2 belongs to PBAF, a unit of the SWI/SNF complex, which is a chromatin remodeling complex. This work aims to further delineate the phenotypic spectrum of ARID2-RD, providing clinicians with additional data for better care and aid in the future diagnosis of this condition.
We obtained the genotypes and phenotypes of 27 previously unreported individuals with ARID2-RD and compared this series with findings in the literature. We also assessed peripheral blood DNA methylation profiles in individuals with ARID2-RD compared to episignatures of controls, unresolved cases, and other neurodevelopmental disorders. The main clinical features of ARID2-RD are developmental delay, speech disorders, intellectual disability (ID), behavior problems, short stature, and various dysmorphic and ectodermal features. Genome-wide differential methylation analysis revealed a global hypermethylated profile in ARID2-RD that could aid in reclassifying variants of uncertain significance. Our study doubles the number of reported individuals with ARID2 pathogenic variants to 53.
It confirms loss-of-function as a pathomechanism and shows the absence of a clear genotype-phenotype correlation. We provide evidence for a unique DNA methylation episignature for ARID2-RD and further delineate the ARID2-associated phenotype.
Epigenetics, Neurodevelopmental disorders
ARID2-related disorder: further delineation of the clinical phenotype of 27 novel individuals and description of an epigenetic signature.
PMID: 40044822, DOI: 10.1038/s41431-025-01798-w, S2CID: 276810567. European Journal of Human Genetics:1-10. 2025, March 5. Epub ahead of print.
Houdayer, Clara; Rooney, Kathleen; van der Laan, Liselot; Bris, Céline; Alders, Mariëlle; Bahr, Angela; Barcia, Giulia; Battault, Clarisse; Begemann, Anais; Bonneau, Dominique; Bonnevalle, Antoine; Boughalem, Aicha; Bourges, Alice; Bournez, Marie; Bruel, Ange-Line; Buhas, Daniela; Carallis, Floriane; Cogné, Benjamin; Cormier-Daire, Valérie; Delanne, Julian; Demaret, Tanguy; Denommé-Pichon, Anne-Sophie; Desir, Julie; Dubourg, Christèle; Fradin, Mélanie; Geneviève, David; Goel, Himanshu; Goldenberg, Alice; Gripp, Karen W; Guichet, Agnès; Guimier, Anne; Jacquinet, Adeline; Keren, Boris; Legoff, Louis; Levy, Michael A.; McConkey, Haley; Mendelsohn, Bryce A.; Mignot, Cyril; Milon, Vincent; Nizon, Mathilde; Oneda, Beatrice; Pasquier, Laurent; Patat, Olivier; Philippe, Christophe; Procaccio, Vincent; Procopio, Rebecca; Prouteau, Clément; Rambaud, Thomas; Rauch, Anita; Relator, Raissa; Rondeau, Sophie; Santen, Gijs W. E.; Schleit, Jennifer; Sorlin, Arthur; Steindl, Katharina; Tedder, Matt; Tessarech, Marine; Mau-Them, Frederic Tran; Trost, Detlef; Van der Sluijs, Pleuntje J.; Vincent, Marie; Whalen, Sandra; Thauvin-Robinet, Christel; Isidor, Bertrand; Sadikovic, Bekim; Vitobello, Antonio; Colin, Estelle
