Browsing by Author "Elmslie, Frances"

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    Biallelic CRELD1 variants cause a multisystem syndrome, including neurodevelopmental phenotypes, cardiac dysrhythmias, and frequent infections
    (Elsevier, 2024) Jeffries, Lauren; Mis, Emily K.; McWalter, Kirsty; Donkervoort, Sandra; Brodsky, Nina N.; Carpier, Jean-Marie; Ji, Weizhen; Ionita, Cristian; Roy, Bhaskar; Morrow, Jon S.; Darbinyan, Armine; Iyer, Krishna; Aul, Ritu B.; Banka, Siddharth; Chao, Katherine R.; Cobbold, Laura; Cohen, Stacey; Custodio, Helena M.; Drummond-Borg, Margaret; Elmslie, Frances; Finanger, Erika; Hainline, Bryan E.; Helbig, Ingo; Hewson, Stacy; Hu, Ying; Jackson, Adam; Josifova, Dragana; Konstantino, Monica; Leach, Meganne E.; Mak, Bryan; McCormick, David; McGee, Elisabeth; Nelson, Stanley; Nguyen, Joanne; Nugent, Kimberly; Ortega, Lucy; Goodkin, Howard P.; Roeder, Elizabeth; Roy, Sani; Sapp, Katie; Saade, Dimah; Sisodiya, Sanjay M.; Stals, Karen; Towner, Shelley; Wilson, William; Deciphering Developmental Disorders; Genomics England Research Consortium; Undiagnosed Disease Network; Khokha, Mustafa K.; Bönnemann, Carsten G.; Lucas, Carrie L.; Lakhani, Saquib A.; Medical and Molecular Genetics, School of Medicine
    Purpose: We sought to delineate a multisystem disorder caused by recessive cysteine-rich with epidermal growth factor-like domains 1 (CRELD1) gene variants. Methods: The impact of CRELD1 variants was characterized through an international collaboration utilizing next-generation DNA sequencing, gene knockdown, and protein overexpression in Xenopus tropicalis, and in vitro analysis of patient immune cells. Results: Biallelic variants in CRELD1 were found in 18 participants from 14 families. Affected individuals displayed an array of phenotypes involving developmental delay, early-onset epilepsy, and hypotonia, with about half demonstrating cardiac arrhythmias and some experiencing recurrent infections. Most harbored a frameshift in trans with a missense allele, with 1 recurrent variant, p.(Cys192Tyr), identified in 10 families. X tropicalis tadpoles with creld1 knockdown displayed developmental defects along with increased susceptibility to induced seizures compared with controls. Additionally, human CRELD1 harboring missense variants from affected individuals had reduced protein function, indicated by a diminished ability to induce craniofacial defects when overexpressed in X tropicalis. Finally, baseline analyses of peripheral blood mononuclear cells showed similar proportions of immune cell subtypes in patients compared with healthy donors. Conclusion: This patient cohort, combined with experimental data, provide evidence of a multisystem clinical syndrome mediated by recessive variants in CRELD1.
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    Missense variants in ANKRD11 cause KBG syndrome by impairment of stability or transcriptional activity of the encoded protein
    (Elsevier, 2022-10) de Boer, Elke; Ockeloen, Charlotte W.; Kampen, Rosalie A.; Hampstead, Juliet E.; Dingemans, Alexander J. M.; Rots, Dmitrijs; Lütje, Lukas; Ashraf, Tazeen; Baker, Rachel; Barat-Houari, Mouna; Angle, Brad; Chatron, Nicolas; Denommé-Pichon, Anne-Sophie; Devinsky, Orrin; Dubourg, Christèle; Elmslie, Frances; Elloumi, Houda Zghal; Faivre, Laurence; Fitzgerald-Butt, Sarah; Geneviève, David; Goos, Jacqueline A. C.; Helm, Benjamin M.; Kini, Usha; Lasa-Aranzasti, Amaia; Lesca, Gaetan; Lynch, Sally A.; Mathijssen, Irene M. J.; McGowan, Ruth; Monaghan, Kristin G.; Odent, Syvie; Pfundt, Rolph; Putoux, Audrey; van Reeuwijk, Jeroen; Santen, Gijs W. E.; Sasaki, Erina; Sorlin, Arthur; van der Spek, Peter J.; Stegmann, Alexander P. A.; Swagemakers, Sigrid M. A.; Valenzuela, Irene; Viora-Dupont, Eléonore; Vitobello, Antonio; Ware, Stephanie M.; Wéber, Mathys; Gilissen, Christian; Low, Karen J.; Fisher, Simon E.; Vissers, Lisenka E. L. M.; Wong, Maggie M. K.; Kleefstra, Tjitske; Pediatrics, School of Medicine
    Purpose Although haploinsufficiency of ANKRD11 is among the most common genetic causes of neurodevelopmental disorders, the role of rare ANKRD11 missense variation remains unclear. We characterized clinical, molecular, and functional spectra of ANKRD11 missense variants. Methods We collected clinical information of individuals with ANKRD11 missense variants and evaluated phenotypic fit to KBG syndrome. We assessed pathogenicity of variants through in silico analyses and cell-based experiments. Results We identified 20 unique, mostly de novo, ANKRD11 missense variants in 29 individuals, presenting with syndromic neurodevelopmental disorders similar to KBG syndrome caused by ANKRD11 protein truncating variants or 16q24.3 microdeletions. Missense variants significantly clustered in repression domain 2 at the ANKRD11 C-terminus. Of the 10 functionally studied missense variants, 6 reduced ANKRD11 stability. One variant caused decreased proteasome degradation and loss of ANKRD11 transcriptional activity. Conclusion Our study indicates that pathogenic heterozygous ANKRD11 missense variants cause the clinically recognizable KBG syndrome. Disrupted transrepression capacity and reduced protein stability each independently lead to ANKRD11 loss-of-function, consistent with haploinsufficiency. This highlights the diagnostic relevance of ANKRD11 missense variants, but also poses diagnostic challenges because the KBG-associated phenotype may be mild and inherited pathogenic ANKRD11 (missense) variants are increasingly observed, warranting stringent variant classification and careful phenotyping.