United States securities and exchange commission logo





                               February 22, 2021

       Jo  o Siffert, M.D.
       President and Chief Executive Officer
       Design Therapeutics, Inc.
       6005 Hidden Valley Road, Suite 110
       Carlsbad, CA 92011

                                                        Re: Design
Therapeutics, Inc.
                                                            Draft Registration
Statement on Form S-1
                                                            Submitted January
26, 2021
                                                            CIK No. 0001807120

       Dear Dr. Siffert:

              We have reviewed your draft registration statement and have the
following comments. In
       some of our comments, we may ask you to provide us with information so
we may better
       understand your disclosure.

              Please respond to this letter by providing the requested
information and either submitting
       an amended draft registration statement or publicly filing your
registration statement on
       EDGAR. If you do not believe our comments apply to your facts and
circumstances or do not
       believe an amendment is appropriate, please tell us why in your
response.

             After reviewing the information you provide in response to these
comments and your
       amended draft registration statement or filed registration statement, we
may have additional
       comments.

       Draft Registration Statement on Form S-1 submitted January 26, 2021

       Prospectus Summary
       Overview, page 1

   1.                                                   Please revise your
disclosure in the first sentence on page 1 to highlight that
                                                        your operations are
preclinical.
   2.                                                   We note references to
preclinical data that your product candidates have "consistently
                                                        restored frataxin (FXN)
levels in cells from FA patients," "reduced nuclear foci in DM1
                                                        patient muscle cells"
and similar statements indicating findings of efficacy. Please revise
                                                        to remove any
statements that suggest the efficacy of your candidates, as these
                                                        determinations are the
exclusive authority of the FDA or other regulators. Also, please
 Jo  o Siffert, M.D.
Design Therapeutics, Inc.
February 22, 2021
Page 2
         limit the prospectus summary discussion of preclinical studies to an
objective description
         of the endpoints of your studies and trials and whether they were met.
For example, rather
         than stating that your "FA GeneTACs have consistently restored
frataxin (FXN) levels in
         cells from FA patients," present your trial observations without
concluding that the FA
         GeneTACs caused the observations. Similarly revise the disclosure
throughout your
         filing.
3.       Revise the table on page 4 to reflect that you have not yet submitted
an IND with respect
         to Friedreich ataxia (GAA) and Myotonic dystrophy (CTG).
4.       We note that you have included in your product pipeline table your
GeneTAC platform
         discovery programs. Given the early-stage development of these
programs, please explain
         why these programs are sufficiently material to your business to
warrant inclusion in
         your pipeline table. If they are material, please expand your
disclosure on pages 118-
         119 to provide a more fulsome discussion of these programs, including
a description of
         preclinical studies or other development activities conducted.
Alternatively, remove any
         programs that are not currently material from your pipeline table.
Management's Discussion and Analysis
Common Stock Valuations, page 98

5.       Once you have an estimated offering price or range, please explain to
us the reasons for
         any significant differences between the recent valuations of your
common stock leading
         up to the initial public offering and the estimated offering price.
This information will help
         facilitate our review of your accounting for equity issuances
including stock compensation
         and beneficial conversion features. Please discuss with the staff how
to submit your
         response.
Business
License Agreement, page 120

6.       We note your disclosure with respect to the WARF License Agreement
that your royalty
         obligation will terminate on the date of expiration of the
last-to-expire of the licensed
         patents in the relevant country. Please revise to clarify when the
patents underlying such
         royalty terms are expected to expire. In addition, revise to disclose
the aggregate
         amounts, if any, paid to date under the WARF License Agreement.
7.     Please briefly describe any of the material terms of the rights retained
by the U.S.
       government. If there are any material march-in-rights, address the
portion of your business
FirstName LastNameJo  o Siffert, M.D.
       that would be impacted by exercise of such rights, and describe the
conditions which
Comapany
       mightNameDesign    Therapeutics,
              prompt the U.S.           Inc.to exercise any such rights.
Include risk factor
                               government
       disclosure
February  22, 2021ifPage
                     appropriate.
                         2
FirstName LastName
 Jo  o Siffert, M.D.
FirstName  LastNameJo  o
Design Therapeutics, Inc. Siffert, M.D.
Comapany22,
February    NameDesign
              2021      Therapeutics, Inc.
February
Page 3 22, 2021 Page 3
FirstName LastName
Intellectual Property, page 122

8.       Please revise your intellectual property disclosure to clearly
describe on an individual
         basis the type of patent protection granted for each technology, the
expiration of each
         patent held, and the jurisdiction, including any foreign jurisdiction,
of each pending or
         issued patent. In addition, please clarify whether each such patent is
owned or licensed.
         In this regard, it may be useful to provide this disclosure in tabular
form to support the
         narrative already included.
9.       Please revise here to disclose the type of intellectual property right
protection applicable
         to your GeneTAC Platform. In your revised disclosure, please clarify
the source of
         protection for your "proprietary" platform, explain why the platform
is "proprietary," and
         disclose the duration of the underlying intellectual property
protection.
Description of Capital Stock
Choice of Forum, page 175

10.      Please ensure that the exclusive forum provision in your amended and
restated certificate
         of incorporation to be effective immediately prior to the closing of
this offering clearly
         states that this provision does not apply to actions arising under the
Securities Act or
         Exchange Act, or tell us how you will inform investors in future
filings that the provision
         does not apply to any actions arising under the Securities Act or
Exchange Act.
General

11.      Please supplementally provide us with copies of all written
communications, as defined in
         Rule 405 under the Securities Act, that you, or anyone authorized to
do so on your behalf,
         present to potential investors in reliance on Section 5(d) of the
Securities Act, whether or
         not they retain copies of the communications.
        You may contact Jeanne Bennett at 202-551-3606 or Vanessa Robertson at
202-551-
3649 if you have questions regarding comments on the financial statements and
related
matters. Please contact Kasey Robinson at 202-551-5880 or Jeffrey Gabor at
202-551-2544 with
any other questions.



                                                               Sincerely,

                                                               Division of
Corporation Finance
                                                               Office of Life
Sciences
cc:      Kenneth Rollins, Esq.