JOURNAL ARTICLE

Detection of brain somatic mutations in CSF from refractory epilepsy patients

Seyeon Kim, Sara Baldassari, Nam Suk Sim, Mathilde Chipaux, Georg Dorfmüller, Dong Seok Kim, Won Seok Chang, Valérie Taly, Jeong Ho Lee, Stéphanie Baulac
Annals of Neurology 2021 April 8
33834539
Brain mosaic mutations are a major cause of refractory focal epilepsies with cortical malformations such as focal cortical dysplasia, hemimegalencephaly, malformation of cortical development with oligodendroglial hyperplasia in epilepsy, or ganglioglioma. Here, we collected 1-6 mL of cerebrospinal fluid (CSF) during epilepsy surgery to search for somatic variants in cell-free DNA (cfDNA) using targeted droplet digital PCR. In 3/12 epileptic patients with known somatic mutations previously identified in brain tissue, we here provide evidence that brain mosaicism can be detected in the CSF-derived cfDNA. These findings suggest future opportunities for detecting the mutant allele driving epilepsy in CSF. This article is protected by copyright. All rights reserved.

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