The Clinical and Genetic Landscape of a French Multicenter Cohort of 2563 Epilepsy Patients Referred for Genetic Diagnosis
Jean‐Madeleine de Sainte Agathe, Pauline Monin, Florence Riccardi, Caroline Nava, Lionel Arnaud, Cyril Mignot, Dorothée Ville, Stéphane Auvin, Sandrine Tardieu, Kathy Larcher, Isabelle Gourfinkel‐An, Mathilde Canon, Vincent Navarro, Bénédicte Héron, Sophie Julia, Diane Doummar, M. Jacquemont, Hélène Maurey, Blandine Dozières‐Puyravel, Laurence Perrin, Laurent Pasquier, Christèle Dubourg, Sylvie Odent, Abdelhakim Bouazzaoui, Wilfrid Carré, Mélanie Fradin, Florence Démurger, Nicolas Chatron, Damien Sanlaville, Miriam Essid, Vincent des Portes, Eleni Panagiotakaki, Anne‐Lise Poulat, Clotilde Rivier, Catherine Sarret, Ganaëlle Remérand, Cécilia Altuzarra, Radka Stoeva, Sylvie Nguyen, Juliette Piard, Élise Boucher, V. Flurin, Anne‐Marie Guerrot, Sylvie Joriot, Béatrice Desnous, Nathalie Villeneuve, Anne Lépine, Caroline Hachon‐Le Camus, Laurent Villard, Marie Faoucher, Mathieu Milh, Gaëtan Lesca, Éric Leguern
Abstract
BACKGROUND: Epileptic disorders are a heterogeneous group of neurological conditions, with many cases linked to monogenic causes, particularly in developmental and epileptic encephalopathies (DEE). Identifying pathogenic variants aids treatment, prognosis, and family planning. In France, genetic testing is coordinated through the EpiGene network. METHODS: We analyzed clinical and genetic data from 2563 epilepsy patients referred to four diagnostic labs (2016-2023). Epilepsy syndromes were classified via pre-test questionnaires, and genotyping used various gene panels, including a 68-gene core panel. Multivariate logistic regression assessed diagnostic rates and genotype-phenotype correlations. RESULTS: Overall, 27.0% of patients had pathogenic/likely pathogenic variants, mainly within the core panel (24%). SCN1A and KCNQ2 were the most frequently mutated genes. Diagnostic yield varied by syndrome, with Dravet Syndrome Spectrum (DSS) and early-infantile DEE (EIDEE) showing the highest rates (41% and 34%, respectively). Genetic heterogeneity differed across syndromes, from DSS (predominantly SCN1A) to Infantile Epileptic Spasms Syndrome (IESS, 12%), involving ≥ 26 genes. Outside DEE, self-limited neonatal epilepsy (SeLNE) had the highest yield (50%). Earlier seizure onset was associated with a higher likelihood of a positive molecular diagnosis, whereas intellectual disability severity and drug resistance were not independently predictive of diagnostic outcome. Genotype-phenotype correlations highlighted that objective clinical data (e.g., age of onset) can outperform syndrome labels (e.g., EIDEE) in predicting diagnosis. CONCLUSION: This large cohort study refines the genetic landscape of epilepsy, informs classification challenges, and enhances genetic testing strategies, ultimately improving patient care and future research directions.