De novo coding variants in the AGO1 gene cause a neurodevelopmental disorder with intellectual disability
Schalk, Audrey; Cousin, Margot A; Dsouza, Nikita R; Challman, Thomas D; Wain, Karen E; Powis, Zoe; Minks, Kelly; Trimouille, Aurélien; Lasseaux, Eulalie; Lacombe, Didier; Angelini, Chloé; Michaud, Vincent; Van-Gils, Julien; Spataro, Nino; Ruiz, Anna; Gabau, Elizabeth; Stolerman, Elliot; Washington, Camerun; Louie, Ray; Lanpher, Brendan C; Kemppainen, Jennifer L; Innes, Micheil; Kooy, Frank; Meuwissen, Marije; Goldenberg, Alice; Lecoquierre, Francois; Vera, Gabriella; Diderich, Karin E M; Sheidley, Beth; El Achkar, Christelle Moufawad; Park, Meredith; Hamdan, Fadi F; Michaud, Jacques L; Lewis, Ann J; Zweier, Christiane; Reis, André; Wagner, Matias; Weigand, Heike; Journel, Hubert; Keren, Boris; Passemard, Sandrine; Mignot, Cyril; van Gassen, Koen; Brilstra, Eva H; Itzikowitz, Gina; O'Heir, Emily; Allen, Jake; Donald, Kirsten A; Korf, Bruce Richard; Skelton, Tammi; Thompson, Michelle; Robin, Nathaniel H; Rudy, Natasha L; Dobyns, William B; Foss, Kimberly; Zarate, Yuri Alexander; Bosanko, Katherine A; Alembik, Yves; Durand, Benjamin; Tran Mau-Them, Frederic; Ranza, Emmanuelle; Blanc, Xavier; Antonarakis, Stylianos E; McWalter, Kirsty; Torti, Erin; Millan, Francisca; Dameron, Amy; Tokita, Mari; Zimmermann, Michael T; Klee, Eric W; Piton, Amelie; Gerard, Benedicte
(2022) Journal of Medical Genetics, volume 59, issue 10, pp. 965 - 975
(Article)
Abstract
Background High-impact pathogenic variants in more than a thousand genes are involved in Mendelian forms of neurodevelopmental disorders (NDD). Methods This study describes the molecular and clinical characterisation of 28 probands with NDD harbouring heterozygous AGO1 coding variants, occurring de novo for all those whose transmission could have been verified
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(26/28). Results A total of 15 unique variants leading to amino acid changes or deletions were identified: 12 missense variants, two in-frame deletions of one codon, and one canonical splice variant leading to a deletion of two amino acid residues. Recurrently identified variants were present in several unrelated individuals: p.(Phe180del), p.(Leu190Pro), p.(Leu190Arg), p.(Gly199Ser), p.(Val254Ile) and p.(Glu376del). AGO1 encodes the Argonaute 1 protein, which functions in gene-silencing pathways mediated by small non-coding RNAs. Three-dimensional protein structure predictions suggest that these variants might alter the flexibility of the AGO1 linker domains, which likely would impair its function in mRNA processing. Affected individuals present with intellectual disability of varying severity, as well as speech and motor delay, autistic behaviour and additional behavioural manifestations.
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Keywords: genetics, medical, microRNA, missense, mutation, nervous system diseases, Genetics(clinical), Genetics, Journal Article
ISSN: 0022-2593
Publisher: BMJ Publishing Group
Note: Publisher Copyright: © Author(s) (or their employer(s)) 2022. No commercial re-use. See rights and permissions. Published by BMJ.
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