| Title: |
Genotype-phenotype correlations in SCN8A-related disorders reveal prognostic and therapeutic implications |
| Authors: |
Johannesen, Katrine M.; Liu, Yuanyuan; Koko, Mahmoud; Gjerulfsen, Cathrine E.; Sonnenberg, Lukas; Schubert, Julian; Fenger, Christina D.; Eltokhi, Ahmed; Rannap, Maert; Koch, Nils A.; Lauxmann, Stephan; Krüger, Johanna; Kegele, Josua; Canafoglia, Laura; Franceschetti, Silvana; Mayer, Thomas; Rebstock, Johannes; Zacher, Pia; Ruf, Susanne; Alber, Michael; Sterbova, Katalin; Lassuthová, Petra; Vlckova, Marketa; Lemke, Johannes R.; Platzer, Konrad; Krey, Ilona; Heine, Constanze; Wieczorek, Dagmar; Kroell-Seger, Judith; Lund, Caroline; Klein, Karl Martin; Billie Au, P.Y.; Rho, Jong M.; Ho, Alice W.; Masnada, Silvia; Veggiotti, Pierangelo; Giordano, Lucio; Accorsi, Patrizia; Hoei-Hansen, Christina E.; Striano, Pasquale; Zara, Federico; Verhelst, Helene; Verhoeven, Judith S.; van der Zwaag, Bert; Harder, Aster V.E.; Brilstra, Eva; Pendziwiat, Manuela; Lebon, Sebastian; Vaccarezza, Maria; Minh Le, Ngoc; Christensen, Jakob; Grønborg, Sabine; Scherer, Stephen W.; Howe, Jennifer; Fazeli, Walid; Howell, Katherine B.; Leventer, Richard; Stutterd, Chloe; Walsh, Sonja; Gerard, Marion; Gerard, Bénédicte; Matricardi, Sara; Bonardi, Claudia M.; Sartori, Stefano; Berger, Andrea; Hoffman-Zacharska, Dorota; Mastrangelo, Massimo; Darra, Francesca; Vøllo, Arve; Motazacker, M. Mahdi; Lakeman, Phillis; Nizon, Mathilde; Betzler, Cornelia; Altuzarra, Cecilia; Caume, Roseline; Roubertie, Agathe; Gélisse, Philippe; Marini, Carla; Guerrini, Renzo; Bilan, Frederic; Tibussek, Daniel; Koch-Hogrebe, Margarete; Perry, M. Scott; Ichikawa, Shoji; Dadali, Elena; Sharkov, Artem; Mishina, Irina; Abramov, Mikhail; Kanivets, Ilya; Korostelev, Sergey; Kutsev, Sergey; Wain, Karen E.; Eisenhauer, Nancy; Wagner, Monisa; Savatt, Juliann M.; Müller-Schlüter, Karen; Bassan, Haim; Borovikov, Artem; Nassogne, Marie-Cecile; Destrée, Anne; Schoonjans, An-Sofie; Meuwissen, Marije; Buzatu, Marga; Jansen, Anna; Scalais, Emmanuel; Srivastava, Siddharth; Tan, Wen-Hann; Olson, Heather E.; Loddenkemper, Tobias; Poduri, Annapurna; Helbig, Katherine L.; Helbig, Ingo; Fitzgerald, Mark P.; Goldberg, Ethan M.; Roser, Timo; Borggraefe, Ingo; Brünger, Tobias; May, Patrick; Lal, Dennis; Lederer, Damien; Rubboli, Guido; Heyne, Henrike O.; Lesca, Gaetan; Hedrich, Ulrike B.S.; Benda, Jan; Gardella, Elena; Lerche, Holger; Møller, Rikke S. |
| Source: |
0006-8950 ; Brain |
| Publication Year: |
2022 |
| Collection: |
IRUA - Institutional Repository van de Universiteit Antwerpen |
| Subject Terms: |
Human medicine |
| Description: |
We report detailed functional analyses and genotype-phenotype correlations in 392 individuals carrying disease-causing variants in SCN8A, encoding the voltage-gated Na+ channel NaV1.6, with the aim of describing clinical phenotypes related to functional effects. Six different clinical subgroups could be identified: 1) Benign familial infantile epilepsy (BFIE) (n = 15, normal cognition, treatable seizures), 2) intermediate epilepsy (n = 33, mild ID, partially pharmaco-responsive), 3) developmental and epileptic encephalopathy (DEE, n = 177, severe ID, majority pharmaco-resistant), 4) generalized epilepsy (n = 20, mild to moderate ID, frequently with absence seizures), 5) unclassifiable epilepsy (n = 127), and 6) neurodevelopmental disorder without epilepsy (n = 20, mild to moderate ID). Groups 1–3 presented with focal or multifocal seizures (median age of onset: four months) and focal epileptiform discharges, whereas the onset of seizures in group 4 was later (median: 42 months) with generalized epileptiform discharges. We performed functional studies expressing missense variants in ND7/23 neuroblastoma cells and primary neuronal cultures using recombinant tetrodotoxin-insensitive human NaV1.6 channels and whole-cell patch-clamping. Two variants causing DEE showed a strong gain-of-function (GOF, hyperpolarising shift of steady-state activation, strongly increased neuronal firing rate), and one variant causing BFIE or intermediate epilepsy showed a mild GOF (defective fast inactivation, less increased firing). In contrast, all three variants causing generalized epilepsy induced a loss-of-function (LOF, reduced current amplitudes, depolarising shift of steady-state activation, reduced neuronal firing). Including previous studies, functional effects were known for 170 individuals. All 136 individuals carrying a functionally tested GOF variant had either focal (97, groups 1–3), or unclassifiable epilepsy (39), whereas 34 with a LOF variant had either generalized (14), no (11) or unclassifiable (6) epilepsy; ... |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/isi/000798879900001 |
| Availability: |
https://hdl.handle.net/10067/1857610151162165141; https://repository.uantwerpen.be/docstore/d:irua:10629 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.B0CF08DB |
| Database: |
BASE |