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Mutations in ACTL6B Cause Neurodevelopmental Deficits and Epilepsy and Lead to Loss of Dendrites in Human Neurons

Scott Bell 1 Justine Rousseau 2 Huashan Peng 1 Zahia Aouabed 1 Pierre Priam 2 Jean-Francois Theroux 1 Malvin Jefri 1 Arnaud Tanti 1 Hanrong Wu 1 Ilaria Kolobova 1 Heika Silviera 1 Karla Manzano-Vargas 1 Sophie Ehresmann 2 Fadi Hamdan 2 Nuwan Hettige 1 Xin Zhang 1 Lilit Antonyan 1 Christina Nassif 2 Lina Ghaloul-Gonzalez 3 Jessica Sebastian 3 Jerry Vockley 3 Amber Begtrup 4 Ingrid Wentzensen 4 Amy Crunk 4 Robert Nicholls 3 Kristin Herman 5 Joshua Deignan 6 Walla Al-Hertani 7 Stephanie Efthymiou 8 Vincenzo Salpietro 8 Noriko Miyake 9 Yoshio Makita 10 Naomichi Matsumoto 9 Rune Østern 11 Gunnar Houge 12 Maria Hafström 11 Emily Fassi 13 Henry Houlden 8 Jolien Klein Wassink-Ruiter 14, 15 Dominic Nelson 1 Amy Goldstein 16 Tabib Dabir 17 Julien van Gils 18 Thomas Bourgeron 18 Richard Delorme 19 Gregory Cooper 20 Jose Martinez 21 Candice Finnila 20 Lionel Carmant 21 Anne Lortie 2 Renske Oegema 22 Koen van Gassen 22 Sarju Mehta 23 Dagmar Huhle 23 Rami Abou Jamra 24 Sonja Martin 24 Han Brunner 25, 26 Dick Lindhout 22 Margaret Au 27 John Graham Jr. 27 Christine Coubes 28 Gustavo Turecki 1 Simon Gravel 14, 15 Naguib Mechawar 1 Elsa Rossignol 2 Jacques Michaud 2 Julie Lessard 2 Carl Ernst 1, * Philippe Campeau 2, *
Abstract : We identified individuals with variations in ACTL6B, a component of the chromatin remodeling machinery including the BAF complex. Ten individuals harbored bi-allelic mutations and presented with global developmental delay, epileptic encephalopathy, and spasticity, and ten individuals with de novo heterozygous mutations displayed intellectual disability, ambulation deficits, severe language impairment, hypotonia, Rett-like stereotypies, and minor facial dysmorphisms (wide mouth, diastema, bulbous nose). Nine of these ten unrelated individuals had the identical de novo c.1027G>A (p.Gly343Arg) mutation. Human-derived neurons were generated that recaptured ACTL6B expression patterns in development from progenitor cell to post-mitotic neuron, validating the use of this model. Engineered knock-out of ACTL6B in wild-type human neurons resulted in profound deficits in dendrite development, a result recapitulated in two individuals with different bi-allelic mutations, and reversed on clonal genetic repair or exogenous expression of ACTL6B. Whole-transcriptome analyses and whole-genomic profiling of the BAF complex in wild-type and bi-allelic mutant ACTL6B neural progenitor cells and neurons revealed increased genomic binding of the BAF complex in ACTL6B mutants, with corresponding transcriptional changes in several genes including TPPP and FSCN1, suggesting that altered regulation of some cytoskeletal genes contribute to altered dendrite development. Assessment of bi-alleic and heterozygous ACTL6B mutations on an ACTL6B knock-out human background demonstrated that bi-allelic mutations mimic engineered deletion deficits while heterozygous mutations do not, suggesting that the former are loss of function and the latter are gain of function. These results reveal a role for ACTL6B in neurodevelopment and implicate another component of chromatin remodeling machinery in brain disease.
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Scott Bell, Justine Rousseau, Huashan Peng, Zahia Aouabed, Pierre Priam, et al.. Mutations in ACTL6B Cause Neurodevelopmental Deficits and Epilepsy and Lead to Loss of Dendrites in Human Neurons. American Journal of Human Genetics, Elsevier (Cell Press), 2019, 104 (5), pp.815-834. ⟨10.1016/j.ajhg.2019.03.022⟩. ⟨pasteur-03325419⟩

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