Clustered mutations in the GRIK2 kainate receptor subunit gene underlie diverse neurodevelopmental disorders
| Autor: | Claudia A. L. Ruivenkamp, Lewis Pang, Nienke P. Dosa, Gemma L. Carvill, Rolph Pfundt, Joseph Junewick, Geoffrey T. Swanson, Nicole de Leeuw, Xing-Chang Wei, Katrin Õunap, Cacha M.P.C.D. Peeters-Scholte, Jacob R. Stolz, Reelika Part, Ionella Rebane, Zornitza Stark, Karen J. Low, Kendall M. Foote, Edwin P. Kirk, Joanna Kennedy, Steven M. Sperber, Sebastian Lunke, Sander Pajusalu, R. Curtis Rogers, Robert Roger Lebel, Jessica M. Davis, Hermine E. Veenstra-Knol, Sanne W. ten Broeke, Raymond J. Louie, A. Micheil Innes, Boris Keren, Ai Sakonju, Daniela Q.C.M. Barge-Schaapveld, John Christodoulou, Paul R. Mark, John A. Lawson, Bregje W.M. van Bon, Laura Roht, Cyril Mignot, Sian Ellard |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Male
Models Molecular Protein Conformation channel gating Developmental Disabilities Kainate receptor white matter abnormalities VARIANTS medicine.disease_cause ACTIVATION chemistry.chemical_compound GLUTAMATE Neurodevelopmental disorder Receptors Kainic Acid whole-exome sequencing Child Evoked Potentials Exome sequencing Genetics (clinical) Genetics Neurons Mutation biology Homozygote Brain Gene Expression Regulation Developmental ASSOCIATION intellectual disability Child Preschool Ion Channel Gating Adult EXPRESSION Kainic acid Heterozygote Adolescent glutamate receptor Article MATURATION All institutes and research themes of the Radboud University Medical Center GRIK2 Intellectual Disability medicine Humans Allele AUTISM Loss function Alleles Genetic Association Studies Neurodevelopmental disorders Donders Center for Medical Neuroscience [Radboudumc 7] Epilepsy ataxia GluK2 Correction GLUTAMATE-RECEPTOR-6 GENE medicine.disease electrophysiology chemistry MOSSY-FIBER SYNAPSES biology.protein LURCHER MUTATION epilepsy |
| Zdroj: | Am J Hum Genet American Journal of Human Genetics, 108, 1692-1709 Stolz, J R, Foote, K M, Veenstra-Knol, H E, Pfundt, R, ten Broeke, S W, de Leeuw, N, Roht, L, Pajusalu, S, Part, R, Rebane, I, Õunap, K, Stark, Z, Kirk, E P, Lawson, J A, Lunke, S, Christodoulou, J, Louie, R J, Rogers, R C, Davis, J M, Innes, A M, Wei, X C, Keren, B, Mignot, C, Lebel, R R, Sperber, S M, Sakonju, A, Dosa, N, Barge-Schaapveld, D Q C M, Peeters-Scholte, C M P C D, Ruivenkamp, C A L, van Bon, B W, Kennedy, J, Low, K J, Ellard, S, Pang, L, Junewick, J J, Mark, P R, Carvill, G L & Swanson, G T 2021, ' Clustered mutations in the GRIK2 kainate receptor subunit gene underlie diverse neurodevelopmental disorders ', American Journal of Human Genetics, vol. 108, no. 9, pp. 1692-1709 . https://doi.org/10.1016/j.ajhg.2021.07.007 American Journal of Human Genetics, 108(9), 1692-1709. CELL PRESS American Journal of Human Genetics, 108, 9, pp. 1692-1709 |
| ISSN: | 0002-9297 |
| DOI: | 10.1016/j.ajhg.2021.07.007 |
| Popis: | Kainate receptors (KARs) are glutamate-gated cation channels with diverse roles in the central nervous system. Bi-allelic loss of function of the KAR-encoding gene GRIK2 causes a nonsyndromic neurodevelopmental disorder (NDD) with intellectual disability and developmental delay as core features. The extent to which mono-allelic variants in GRIK2 also underlie NDDs is less understood because only a single individual has been reported previously. Here, we describe an additional eleven individuals with heterozygous de novo variants in GRIK2 causative for neurodevelopmental deficits that include intellectual disability. Five children harbored recurrent de novo variants (three encoding p.Thr660Lys and two p.Thr660Arg), and four children and one adult were homozygous for a previously reported variant (c.1969G>A [p.Ala657Thr]). Individuals with shared variants had some overlapping behavioral and neurological dysfunction, suggesting that the GRIK2 variants are likely pathogenic. Analogous mutations introduced into recombinant GluK2 KAR subunits at sites within the M3 transmembrane domain (encoding p.Ala657Thr, p.Thr660Lys, and p.Thr660Arg) and the M3-S2 linker domain (encoding p.Ile668Thr) had complex effects on functional properties and membrane localization of homomeric and heteromeric KARs. Both p.Thr660Lys and p.Thr660Arg mutant KARs exhibited markedly slowed gating kinetics, similar to p.Ala657Thr-containing receptors. Moreover, we observed emerging genotype-phenotype correlations, including the presence of severe epilepsy in individuals with the p.Thr660Lys variant and hypomyelination in individuals with either the p.Thr660Lys or p.Thr660Arg variant. Collectively, these results demonstrate that human GRIK2 variants predicted to alter channel function are causative for early childhood development disorders and further emphasize the importance of clarifying the role of KARs in early nervous system development. |
| Databáze: | OpenAIRE |
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