Epileptic encephalopathies: de novo mutations take center stage

The de novo paradigm. De novo mutations play a significant role in many neurodevelopmental disorders including autism, intellectual disability and schizophrenia. In addition, several smaller studies have indicated a role for de novo mutations in severe epilepsies. However, unless known genes for human epilepsies are involved, findings from large-scale genetic studies are difficult to interpret. De novo mutations are also seen in unaffected individuals and only very few genes are observed more than once. Now, a publication in Nature by the Epi4K and EPGP collaborators uses a novel framework to tell pathogenic mutations from genomic noise. Their study provides very strong evidence for a predominant role of de novo mutations in Infantile Spasms and Lennox-Gastaut Syndrome. Continue reading