<SEC-DOCUMENT>0001209191-21-024234.txt : 20210401
<SEC-HEADER>0001209191-21-024234.hdr.sgml : 20210401
<ACCEPTANCE-DATETIME>20210401181957
ACCESSION NUMBER:		0001209191-21-024234
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210330
FILED AS OF DATE:		20210401
DATE AS OF CHANGE:		20210401

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Xu Stella
		CENTRAL INDEX KEY:			0001728741

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40288
		FILM NUMBER:		21799758

	MAIL ADDRESS:	
		STREET 1:		C/O ARMO BIOSCIENCES, INC.
		STREET 2:		575 CHESAPEAKE DRIVE
		CITY:			REDWOOD CITY
		STATE:			CA
		ZIP:			94063

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Design Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001807120
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				823929248
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		991C LOMAS SANTA FE #436
		CITY:			SOLANA BEACH
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		858-293-4900

	MAIL ADDRESS:	
		STREET 1:		991C LOMAS SANTA FE #436
		CITY:			SOLANA BEACH
		STATE:			CA
		ZIP:			92121
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
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    <periodOfReport>2021-03-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001807120</issuerCik>
        <issuerName>Design Therapeutics, Inc.</issuerName>
        <issuerTradingSymbol>DSGN</issuerTradingSymbol>
    </issuer>

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            <rptOwnerCik>0001728741</rptOwnerCik>
            <rptOwnerName>Xu Stella</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O DESIGN THERAPEUTICS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>6005 HIDDEN VALLEY ROAD, SUITE 110</rptOwnerStreet2>
            <rptOwnerCity>CARLSBAD</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92011</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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                <value>Common Stock</value>
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            <transactionDate>
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            <transactionCoding>
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                <natureOfOwnership>
                    <value>See footnote</value>
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        </nonDerivativeTransaction>
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            <securityTitle>
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                <directOrIndirectOwnership>
                    <value>I</value>
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                <transactionPricePerShare>
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                <natureOfOwnership>
                    <value>By spouse</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Series A Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
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            <transactionDate>
                <value>2021-03-30</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>7236938</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4439839</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series B Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
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            <transactionDate>
                <value>2021-03-30</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>458016</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F1"/>
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            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>280991</value>
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            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 1.63 shares of Preferred Stock, based on the conversion price currently in effect.  The Preferred Stock has no expiration date.</footnote>
        <footnote id="F2">The general partner of Quan Venture Fund II, L.P. is Quan Venture Partners II, L.L.C.  Stella Xu is a managing director of Quan Venture Partners II, L.L.C. and shares the ultimate power to vote or dispose of the shares held by Quan Venture Fund II, L.P.  Dr. Xu disclaims beneficial ownership of the shares held by Quan Venture Fund II, L.P., except to the extent of her pecuniary interest.</footnote>
        <footnote id="F3">The shares were purchased in the Issuer's initial public offering.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Mustapha Parekh, Attorney-in-Fact</signatureName>
        <signatureDate>2021-03-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
