Antisense oligonucleotide-mediated knockdown therapy in two infants with severe KCNT1 epileptic encephalopathy
KCNT1-related epileptic encephalopathy, including epilepsy of infancy with migrating focal seizures, is a severe neurodevelopmental disorder associated with refractory seizures, profound neurologic impairment and premature death. It is caused by de novo genetic variants in KCNT1 that alter the function of Slack, an evolutionarily conserved sodium-gated potassium channel that modulates neuronal firing patterns and excitability. Pathogenic KCNT1 variants lead to overactive Slack channels, boosting total neuronal potassium currents by up to 40%, driving cortical hyperexcitability and causing seizures. Here we investigate antisense oligonucleotide-mediated KCNT1 knockdown as a therapeutic strategy for patients with epilepsy of infancy with migrating focal seizures. Intrathecal delivery of an experimental, non-allele-specific, KCNT1-targeting antisense oligonucleotide by lumbar puncture in two 2-year-old females with KCNT1 p.R474H, a severe, recurrent pathogenic variant, led to a significant reduction in seizure frequency and intensity. However, investigational treatment was also associated with the development of ventricular enlargement or hydrocephalus in both patients, prompting in one case the redirection of goals of care, pointing to a potential monitorable toxicity of some intrathecal antisense oligonucleotides.
Authors
- Claudio M. de Gusmão (ORCID: https://orcid.org/0000-0001-7171-1406)
- M J Li
- Banu Ahtam (ORCID: https://orcid.org/0000-0003-2036-092X)
- Hélène Tran (ORCID: https://orcid.org/0000-0002-1264-9128)
- Ashley Kuniholm
- Snezana Maljevic (ORCID: https://orcid.org/0000-0003-1876-5872)
- Charles B. Berde (ORCID: https://orcid.org/0000-0002-1801-6399)
- Imran H. Quraishi (ORCID: https://orcid.org/0000-0003-2859-7446)
- Lynn Bush (ORCID: https://orcid.org/0000-0001-6668-188X)
- Edith López
- Timothy W. Yu (ORCID: https://orcid.org/0000-0003-2988-7701)
- Renata L. DiDonato
- Siobhan Coffman (ORCID: https://orcid.org/0009-0000-7903-1261)
- Benjamin D. Goodlett
- Claudia Lentucci
- Diana Chin (ORCID: https://orcid.org/0000-0002-1645-3552)
- Sonia Hills (ORCID: https://orcid.org/0000-0002-5302-3236)
- Victoria Suslovitch (ORCID: https://orcid.org/0000-0002-4905-8743)
- Boxun Zhao (ORCID: https://orcid.org/0000-0003-2337-5756)
- Olivia Riccardi
- Yutaro Asami
- Emma Sherrill
- Aubrie Soucy Verran
- LK Kaczmarek
- J S Wu
- Danielle A. Friedman
- Richard S Smith
- Sean R Golinski
- Patricia Ellen Grant
- Chunguang A. Hu
- Christelle M. El Achkar
- Tojo Nakayama
- Joseph R. Madsen (ORCID: https://orcid.org/0009-0001-5377-8997)
- Lisseth E. Burbano
- Kamli N. W. Faour
Institutions
- Broad Institute (US)
- Northwestern University (US)
- Boston Children's Hospital (US)
- Harvard University (US)
- The University of Melbourne (AU)
- Florey Institute of Neuroscience and Mental Health (AU)
- Université Paris-Saclay (FR)
- CEA Paris-Saclay - Etablissement de Saclay (FR)
- Yale University (US)
- Institut des Neurosciences Paris-Saclay (FR)
- Institut Rayonnement-Matière de Saclay (FR)
- Center for Pain and the Brain (US)
- Boston Children's Museum (US)
- Peptide Institute (Japan) (JP)
Publication Details
- Journal
- Nature Medicine
- Published
- 2026-04-01
- DOI
- https://doi.org/10.1038/s41591-026-04314-9
- Primary Topic
- Ion channel regulation and function
- Type
- article
- Field-Weighted Citation Impact
- 0.00