Browsing by Author "Klöckner, Chiara"

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    Variants in GNAI1 cause a syndrome associated with variable features including developmental delay, seizures, and hypotonia
    (Elsevier, 2021-05) Muir, Alison M.; Gardner, Jennifer F.; van Jaarsveld, Richard H.; de Lange, Iris M.; van der Smagt, Jasper J.; Wilson, Golder N.; Dubbs, Holly; Goldberg, Ethan M.; Zitano, Lia; Bupp, Caleb; Martinez, Jose; Srour, Myriam; Accogli, Andrea; Alhakeem, Afnan; Meltzer, Meira; Gropman, Andrea; Brewer, Carole; Caswell, Richard C.; Montgomery, Tara; McKenna, Caoimhe; McKee, Shane; Powell, Corinna; Vasudevan, Pradeep C.; Brady, Angela F.; Joss, Shelagh; Tysoe, Carolyn; Noh, Grace; Tarnopolsky, Mark; Brady, Lauren; Zafar, Muhammad; Schrier Vergano, Samantha A.; Murray, Brianna; Sawyer, Lindsey; Hainline, Bryan E.; Sapp, Katherine; DeMarzo, Danielle; Huismann, Darcy J.; Wentzensen, Ingrid M.; Schnur, Rhonda E.; Monaghan, Kristin G.; Juusola, Jane; Rhodes, Lindsay; Dobyns, William B.; Lecoquierre, Francois; Goldenberg, Alice; Polster, Tilman; Axer-Schaefer, Susanne; Platzer, Konrad; Klöckner, Chiara; Hoffman, Trevor L.; MacArthur, Daniel G.; O'Leary, Melanie C.; VanNoy, Grace E.; England, Eleina; Varghese, Vinod C.; Mefford, Heather C.; Medical and Molecular Genetics, School of Medicine
    Purpose: Neurodevelopmental disorders (NDDs) encompass a spectrum of genetically heterogeneous disorders with features that commonly include developmental delay, intellectual disability, and autism spectrum disorders. We sought to delineate the molecular and phenotypic spectrum of a novel neurodevelopmental disorder caused by variants in the GNAI1 gene. Methods: Through large cohort trio-based exome sequencing and international data-sharing, we identified 24 unrelated individuals with NDD phenotypes and a variant in GNAI1, which encodes the inhibitory Gαi1 subunit of heterotrimeric G-proteins. We collected detailed genotype and phenotype information for each affected individual. Results: We identified 16 unique variants in GNAI1 in 24 affected individuals; 23 occurred de novo and 1 was inherited from a mosaic parent. Most affected individuals have a severe neurodevelopmental disorder. Core features include global developmental delay, intellectual disability, hypotonia, and epilepsy. Conclusion: This collaboration establishes GNAI1 variants as a cause of NDDs. GNAI1-related NDD is most often characterized by severe to profound delays, hypotonia, epilepsy that ranges from self-limiting to intractable, behavior problems, and variable mild dysmorphic features.