Exhibit 99.1 Design Therapeutics Announces First Quarter 2024 Financial Results and Highlights Upcoming Program Milestones Advancing DT-216P2, New Drug Product for Friedreich Ataxia (FA), Toward Clinical Trials Starting Phase 1 Development for Fuchs Endothelial Corneal Dystrophy (FECD) in 2024; Observational Study Currently Enrolling Patients Progressing GeneTACTM Pipeline Programs in Huntington’s Disease (HD) and Myotonic Dystrophy Type-1 (DM1) to Development Candidates Cash and Securities of $270.7 Millio ...