Exhibit 99.1 Design Therapeutics Outlines Progress Across GeneTAC™ Platform and Announces Fourth Quarter and Full Year 2023 Financial Results New Drug Product for Friedreich Ataxia (FA) DT-216P2 with Favorable Nonclinical Pharmacokinetic and Injection Site Safety Profile; Complete GLP Studies by Year-end 2024 to Start Patient Trials in 2025 IND Cleared for DT-168 for Treatment of Fuchs Endothelial Corneal Dystrophy (FECD) with Phase 1 Development to Start in 2024; Observational Study Underway to Confirm Pat ...

CARLSBAD, Calif., March 12, 2024 (GLOBE NEWSWIRE) -- Design Therapeutics, Inc. (NASDAQ:DSGN), a biotechnology company developing treatments for serious degenerative genetic diseases, today announced that the company will host a conference call and live webcast on Tuesday, March 19, 2024, at 4:30 p.m. ET to discuss its fourth quarter and full year 2023 financial results and provide a comprehensive portfolio update. The event will be webcast live under the "Events" section of the Investors page of www.designt ...

For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-40288 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Design Therapeutics, Inc. (Exact Name of Registrant as Specified in its Charter) (State or other jurisdiction of incorp ...

Note: Treatment assignment is blinded. Based upon data transfer of August 7th 2023 *GAA repeat length of the shorter allele 9 Phase 1 MAD Study Blinded Safety DT-216 generally well tolerated; injection site reactions observed 10 | --- | --- | |--------------------------------------------------------------------------------|-------| | | | | Blinded Adverse Events | | | | | | • No serious adverse events (AEs) and no treatment-related discontinuations | | | • All AEs were mild or moderate; none were severe | | ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION OR WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware 82-3929248 (I.R.S. Employer Identification No.) For the transition period from to Registrant's telephone number, including area code: (858) 293-4900 Securities registered pursuant to ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-40288 Design Therapeutics, Inc. (Exact Name of Registrant as Specified in its Charter) (State or other jurisdiction of incorporat ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K Securities registered pursuant to Section 12(b) of the Act: (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 001-40288 Design Therapeutics, Inc. (Exact name of Registrant as specified in ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-40288 | --- | --- | |-------------------------------------------------------------------------------------------------------- ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-40288 | --- | --- | |------------------------------------------------------------------------------------------------------------- ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-40288 Design Therapeutics, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 82-3929248 ( State or other juris ...