Refining genotypes and phenotypes in KCNA2-related neurological disorders

• Verfasst von: Driedger, Jan Henje [VerfasserIn]
• Verfasst von: Schröter, Julian [VerfasserIn]
• Verfasst von: Jüngling, Jerome [VerfasserIn]
• Verfasst von: Biskup, Saskia [VerfasserIn]
• Verfasst von: Klotz, Kerstin A. [VerfasserIn]
• Verfasst von: Bast, Thomas [VerfasserIn]
• Verfasst von: Dietel, Tobias [VerfasserIn]
• Verfasst von: Korenke, Christoph [VerfasserIn]
• Verfasst von: Christoph, Sophie [VerfasserIn]
• Verfasst von: Brennenstuhl, Heiko [VerfasserIn]
• Verfasst von: Rubboli, Guido [VerfasserIn]
• Verfasst von: Møller, Rikke S. [VerfasserIn]
• Verfasst von: Lesca, Gaetan [VerfasserIn]
• Verfasst von: Chaix, Yves [VerfasserIn]
• Verfasst von: Kölker, Stefan [VerfasserIn]
• Verfasst von: Hoffmann, Georg F. [VerfasserIn]
• Verfasst von: Lemke, Johannes [VerfasserIn]
• Verfasst von: Syrbe, Steffen [VerfasserIn]
• Titel: Refining genotypes and phenotypes in KCNA2-related neurological disorders
• Verf.angabe: Jan H. Döring, Julian Schröter, Jerome Jüngling, Saskia Biskup, Kerstin A. Klotz, Thomas Bast, Tobias Dietel, G. Christoph Korenke, Sophie Christoph, Heiko Brennenstuhl, Guido Rubboli, Rikke S. Møller, Gaetan Lesca, Yves Chaix, Stefan Kölker, Georg F. Hoffmann, Johannes R. Lemke and Steffen Syrbe
• E-Jahr: 2021
• Jahr: 10 March 2021
• Fussnoten: Gesehen am 15.06.2021
• Titel Quelle: Enthalten in: International journal of molecular sciences
• Ort Quelle: Basel : Molecular Diversity Preservation International, 2000
• Jahr Quelle: 2021
• Band/Heft Quelle: 22(2021), 6, Artikel-ID 2824, Seite 1-16
• ISSN Quelle: 1422-0067
• ISSN Quelle: 1661-6596
• DOI: doi:10.3390/ijms22062824
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: ataxia
• Sach-SW: epilepsy
• Sach-SW: epileptic encephalopathy
• Sach-SW: K_v1.2
• Sach-SW: shaker
• Sach-SW: voltage-gated potassium channel
• K10plus-PPN: 176043874X

Abstract

Pathogenic variants in KCNA2, encoding for the voltage-gated potassium channel Kv1.2, have been identified as the cause for an evolving spectrum of neurological disorders. Affected individuals show early-onset developmental and epileptic encephalopathy, intellectual disability, and movement disorders resulting from cerebellar dysfunction. In addition, individuals with a milder course of epilepsy, complicated hereditary spastic paraplegia, and episodic ataxia have been reported. By analyzing phenotypic, functional, and genetic data from published reports and novel cases, we refine and further delineate phenotypic as well as functional subgroups of KCNA2-associated disorders. Carriers of variants, leading to complex and mixed channel dysfunction that are associated with a gain- and loss-of-potassium conductance, more often show early developmental abnormalities and an earlier onset of epilepsy compared to individuals with variants resulting in loss- or gain-of-function. We describe seven additional individuals harboring three known and the novel KCNA2 variants p.(Pro407Ala) and p.(Tyr417Cys). The location of variants reported here highlights the importance of the proline(405)-valine(406)-proline(407) (PVP) motif in transmembrane domain S6 as a mutational hotspot. A novel case of self-limited infantile seizures suggests a continuous clinical spectrum of KCNA2-related disorders. Our study provides further insights into the clinical spectrum, genotype-phenotype correlation, variability, and predicted functional impact of KCNA2 variants.