Neurogene Doses First Participant in Embolden™ Registrational Trial of NGN-401 for Rett Syndrome
November 6, 2025

Neurogene announced today that the first participant has been dosed in their registrational clinical trial evaluating NGN-401, a gene therapy for Rett syndrome.
Key details:
- Single-arm, open-label, study in 20 females aged three years and older.
- Enrollment expected to complete within three to six months at 13 US clinical sites
- Trial intended to support a Biologics License Application (BLA) — a formal request to the FDA to approve a biological product, such as a gene therapy, for clinical use.
- Community letter to come shortly