1. A MT-TL1 variant identified by whole exome sequencing in an individual with intellectual disability, epilepsy, and spastic tetraparesis
- Author
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de Boer, Elke, Ockeloen, Charlotte W., Matalonga, Leslie, Horvath, Rita, Cohen, Enzo, Cuesta, Isabel, Danis, Daniel, Denommé-Pichon, Anne-Sophie, Duffourd, Yannis, Gilissen, Christian, Johari, Mridul, Laurie, Steven, Li, Shuang, Nelson, Isabelle, Peters, Sophia, Paramonov, Ida, Prasanth, Sivakumar, Robinson, Peter, Sablauskas, Karolis, Savarese, Marco, Steyaert, Wouter, Töpf, Ana, van der Velde, Joeri K., Vitobello, Antonio, Rodenburg, Richard J., Coenen, Marieke J. H., Janssen, Mirian, Henssen, Dylan, Banka, Siddharth, Benetti, Elisa, Casari, Giorgio, Ciolfi, Andrea, Clayton-Smith, Jill, Dallapiccola, Bruno, Ellwanger, Kornelia, Faivre, Laurence, Graessner, Holm, Haack, Tobias B., Hammarsjö, Anna, Havlovicova, Marketa, Hoischen, Alexander, Hugon, Anne, Jackson, Adam, Kleefstra, Tjitske, Lindstrand, Anna, López-Martín, Estrella, Macek, Milan, Morleo, Manuela, Nigro, Vicenzo, Nordgren, Ann, Pettersson, Maria, Pinelli, Michele, Pizzi, Simone, Posada, Manuel, Radio, Francesca Clementina, Renieri, Alessandra, Rooryck, Caroline, Ryba, Lukas, Schwarz, Martin, Tartaglia, Marco, Thauvin, Christel, Torella, Annalaura, Verloes, Alain, Vissers, Lisenka, Votypka, Pavel, Vyshka, Klea, Zurek, Birte, Trimouille, Aurélien, Vissers, Lisenka E. L. M., Laboratoire Maladies Rares: Génétique et Métabolisme (Bordeaux) (U1211 INSERM/MRGM), Université de Bordeaux (UB)-Groupe hospitalier Pellegrin-Institut National de la Santé et de la Recherche Médicale (INSERM), Département de génétique [Robert Debré], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-AP-HP Hôpital universitaire Robert-Debré [Paris], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), European Research Council, Evelyn Trust, Newton Fund, European Project: 825619,AI4EU, Dutch Research Council (Holanda), Medical Research Council (Reino Unido), Lily Foundation, Unión Europea. Comisión Europea. H2020, Ockeloen, Charlotte W [0000-0003-0329-1520], Horvath, Rita [0000-0002-9841-170X], Rodenburg, Richard J [0000-0001-5227-3527], Gilissen, Christian [0000-0003-1693-9699], Steyaert, Wouter [0000-0001-8393-0788], Trimouille, Aurélien [0000-0002-3457-5684], Verloes, Alain [0000-0003-4819-0264], Vissers, Lisenka ELM [0000-0001-6470-5497], Apollo - University of Cambridge Repository, de Boer, E., Ockeloen, C. W., Matalonga, L., Horvath, R., Rodenburg, R. J., Coenen, M. J. H., Janssen, M., Henssen, D., Gilissen, C., Steyaert, W., Paramonov, I., Trimouille, A., Kleefstra, T., Verloes, A., Vissers, L. E. L. M., Nigro, V., Torella, A., and Banfi, S.
- Subjects
Male ,Proband ,Mitochondrial DNA ,RNA, Transfer, Leu ,Brief Communication ,Quadriplegia ,Whole Exome Sequencing ,Healthcare improvement science Radboud Institute for Health Sciences [Radboudumc 18] ,Young Adult ,03 medical and health sciences ,Epilepsy ,0302 clinical medicine ,Intellectual Disability ,Exome Sequencing ,Genetics research ,Intellectual disability ,Genetics ,medicine ,Humans ,Genetics (clinical) ,Exome sequencing ,0303 health sciences ,Neurodevelopmental disorders Donders Center for Medical Neuroscience [Radboudumc 7] ,business.industry ,Neurodevelopmental disorders ,030305 genetics & heredity ,Correction ,Metabolic Disorders Radboud Institute for Molecular Life Sciences [Radboudumc 6] ,Translational research ,medicine.disease ,Heteroplasmy ,3. Good health ,MT-TL1 ,Mutation ,Inflammatory diseases Radboud Institute for Health Sciences [Radboudumc 5] ,Spastic tetraparesis ,business ,[SDV.MHEP]Life Sciences [q-bio]/Human health and pathology ,Neurological disorders ,030217 neurology & neurosurgery - Abstract
Correction: A MT-TL1 variant identified by whole exome sequencing in an individual with intellectual disability, epilepsy, and spastic tetraparesis. Eur J Hum Genet. 2021 Sep;29(9):1470-1471. doi: 10.1038/s41431-021-00937-3. The genetic etiology of intellectual disability remains elusive in almost half of all affected individuals. Within the Solve-RD consortium, systematic re-analysis of whole exome sequencing (WES) data from unresolved cases with (syndromic) intellectual disability (n = 1,472 probands) was performed. This re-analysis included variant calling of mitochondrial DNA (mtDNA) variants, although mtDNA is not specifically targeted in WES. We identified a functionally relevant mtDNA variant in MT-TL1 (NC_012920.1:m.3291T > C; NC_012920.1:n.62T > C), at a heteroplasmy level of 22% in whole blood, in a 23-year-old male with severe intellectual disability, epilepsy, episodic headaches with emesis, spastic tetraparesis, brain abnormalities, and feeding difficulties. Targeted validation in blood and urine supported pathogenicity, with heteroplasmy levels of 23% and 58% in index, and 4% and 17% in mother, respectively. Interestingly, not all phenotypic features observed in the index have been previously linked to this MT-TL1 variant, suggesting either broadening of the m.3291T > C-associated phenotype, or presence of a co-occurring disorder. Hence, our case highlights the importance of underappreciated mtDNA variants identifiable from WES data, especially for cases with atypical mitochondrial phenotypes and their relatives in the maternal line. This work was financially supported by Aspasia grants of the Dutch Research Council (015.014.036 to TK and 015.014.066 to LELMV), the European Research Council (ERC to RH), the Well come Investigator Award (109915/Z/15/Z to RH), the Medical Research Council UK (MR/N025431/1 to RH), the Newton Fund (MR/N027302/1 to RH), the Lily Foundation (RH), and the Evelyn Trust (RH). The Solve-RD project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 779257. Sí
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- 2021
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