UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

TAYSHA GENE THERAPIES, INC.

(Name of Issuer)

Common Stock, par value $0.00001

(Title of Class of Securities)

877619106

(CUSIP Number)

Audentes Therapeutics, Inc.

600 California Street

17th Floor

San Francisco, CA 94108

Attention: President

(415) 818-1005

With a copy to:

Astellas US LLC

1 Astellas Way

Northbrook, IL 60062

Attn: General Counsel

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

October 21, 2022

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of § 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box  ☐.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See § 240.13d-7(b) for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP No. 877619106

2

CUSIP No. 877619106

3

CUSIP No. 877619106

4

This Schedule 13D (the “Statement”) relates to the common stock, par value $0.00001 per share (the “Common Stock”), of Taysha Gene Therapies, Inc., a Delaware corporation (the “Issuer”). The Issuer’s principal executive offices are located at 3000 Pegasus Park Drive, Suite 1430, Dallas, Texas 75247.

This Statement is being filed on behalf of each of the following persons (each a “Reporting Person” and, collectively, the “Reporting Persons”):

(i) Astellas Pharma Inc., a company incorporated under the laws of Japan (“Astellas”), with its principal business address at 2-5-1, Nihonbashi-Honcho, Chuo-Ku, Tokyo 103-8411, Japan;

(ii) Astellas US Holding, Inc., a company incorporated under the laws of Delaware (“Astellas US”), with its principal business address at 1 Astellas Way, Northbrook, IL 60062; and

(iii) Audentes Therapeutics, Inc., a company incorporated under the laws of Delaware (“Audentes”), with its principal business address at 600 California Street, 17th Floor, San Francisco, CA 94108.

The Reporting Persons are part of a pharmaceutical business operating in more than 70 countries around the world. The business is promoting the Focus Area Approach that is designed to identify opportunities for the continuous creation of new drugs to address diseases with high unmet medical needs by focusing on Biology and Modality.

The directors and executive officers of each Reporting Person are set forth on Schedule I, attached hereto. Schedule I sets forth the following information with respect to each such person:

(a) name;

(b) business address;

(c) position with the Reporting Person and present principal occupation or employment and, for persons not employed by the Reporting Persons, the name, principal business and address of any corporation or other organization in which such employment is conducted; and

(f) citizenship.

During the last five years, neither the Reporting Persons nor any person named in Schedule I have been (i) convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (ii) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction, as a result of which, he, she or it was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Item 6 of this Statement is incorporated herein by reference. Capitalized terms used but not defined in this Item 3 or the preceding Items of this Statement are defined in Item 6.

On October 21, 2022, the Issuer entered into the Securities Purchase Agreement with Audentes, pursuant to which, among other things, the Issuer agreed to sell to Audentes and Audentes agreed to purchase from the Issuer 7,266,342 shares of the Issuer’s Common Stock at a price per share of $4.13, for an aggregate purchase price of $30,009,992.46. Audentes paid such purchase price to the Issuer and, on the Closing Date, the Issuer delivered to Audentes such shares of Common Stock and the transaction contemplated by the Securities Purchase Agreement closed.

Also on October 21, 2022, the Issuer and Audentes entered into an Option Agreement, attached hereto as Exhibit 7 (the “Option Agreement”). Pursuant to the Option Agreement, as partial consideration for the rights afforded to Audentes thereunder, Audentes agreed to pay the Upfront Payment. Audentes or any of its affiliates have the right, in its or their discretion and upon written notice to the Issuer, to offset the amount of the Upfront Payment (in whole or in part, until the full amount of the Upfront Payment has been offset) against (i) any payment(s) owed to the Issuer or any of its affiliates (or to any third party on behalf of the Issuer) under or in connection with any license agreement entered into with respect to any GAN Product or Rett Product, including, any upfront payment, milestone payment or royalties owed to the Issuer or any of its affiliates (or to any third party on behalf of the Issuer) under or in connection with any such license agreement or (ii) any amount owed to the Issuer or any of its affiliates in connection with a Change of Control transaction with Audentes or any of its affiliates. As further consideration for the rights granted to Audentes under the Option Agreement, the Issuer and Audentes also entered into the Securities Purchase Agreement.

The source of funds for these transactions was general working capital and cash on hand.

Item 6 of this Statement is incorporated herein by reference. Capitalized terms used but not defined in this Item 4 or the preceding Items of this Statement are defined in Item 6.

As discussed in more detail in Item 6 of this Statement, the Option Agreement affords Audentes certain Options with respect to the Issuer’s GAN Products and Rett Products, as well as certain Change of Control Rights. In addition, the Option Agreement affords Audentes certain Monitoring Rights, pursuant to which the Reporting Persons can and intend to monitor the desirability of exercising, and potentially exercise, the Options and the Change of Control Rights.

At present, the Reporting Persons intend to monitor the Issuer’s development of GAN Products and Rett Products, subject to the applicable provisions of the Option Agreement. However, Reporting Persons are and intend to continue monitoring the advisability of (i) negotiating or exercising the Options or (ii) proposing, seeking and consummating a Change of Control transaction with the Issuer. In connection with that, the Reporting Persons may, at any time, exercise (i) their Options or (ii) their Change of Control Rights, including making an offer to engage in a Change of Control transaction. Any such exercise of the Options or Change of Control transaction may be financed, in whole or in part, with the Upfront Payment.

The acquisition by the Reporting Persons of the Issuer’s securities as described herein was effected pursuant to the Securities Purchase Agreement. The Reporting Persons acquired their securities in furtherance of the purpose of the Option Agreement, including the Options and Change of Control Rights.

Subject to the Lock-up, the Reporting Persons intend to continue to review their investment in the Issuer on an ongoing basis and, depending on various factors, including, without limitation, the Issuer’s financial position, the price of the Common Stock, conditions in the securities markets and general economic and industry conditions, the Reporting Persons may, in the future, take such actions with respect to their shares of Common Stock as they deem appropriate, including, without limitation: purchasing additional shares of Common Stock (which may be in connection with a Change of Control); selling shares of Common Stock (including in registered offerings pursuant to the Registration Rights Agreement); taking any other action with respect to the Issuer or any of its securities in any manner permitted by law or with respect to any and all matters referred to in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

Except as described in this Statement, the Reporting Persons do not have any present plans or proposals that relate to or would result in any of the actions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D. However, subject to compliance with the agreements described in Item 6 of this Statement, the Reporting Persons, at any time and from time to time, may review, reconsider and change their position or change their purpose or develop such plans.

(a)-(b)

Number of shares of Common Stock beneficially owned:

Percent of class:

The percentage ownership was calculated based upon the sum of (i) 41,175,939 shares of the Issuer’s Common Stock outstanding as of October 17, 2022, as represented by the Issuer in the Securities Purchase Agreement, (ii) an additional 7,266,342 shares of the Issuer’s Common Stock outstanding following the closing under the Securities Purchase Agreement and (iii) an additional 14,000,000 shares of the Issuer’s Common Stock outstanding (assuming no exercise of the underwriter’s over-allotment option) following the closing of the public offering as set forth in the Issuer’s Form 424(b)(5) prospectus supplement dated October 26, 2022.

Number of shares of Common Stock as to which such person has:

None of the individuals listed on Schedule I beneficially owns any of the Issuer’s Common Stock.

(c) Except as reported in this Statement, neither the Reporting Persons nor any of the individuals listed on Schedule I have effected any transactions in the Common Stock during the past sixty (60) days.

(d) Not applicable.

(e) Not applicable.

Option Agreement

On October 21, 2022 (the “Effective Date”), the Issuer and Audentes entered into the Option Agreement.

The Options

Under the Option Agreement, the Issuer granted to Audentes an exclusive option to obtain an exclusive, worldwide, royalty and milestone-bearing right and license (i) to research, develop, make, have made, use, sell, offer for sale, have sold, import, export and otherwise exploit (collectively, “Exploit”) the product known, as of the Effective Date, as TSHA-120 (the “120 GAN Product”) and any backup products with respect thereto for use in the treatment of giant axonal neuropathy (“GAN”) or any other gene therapy product for use in the treatment of GAN that is controlled by the Issuer or any of its affiliates or with respect to which the Issuer or any of its affiliates controls intellectual property rights covering the Exploitation thereof (each, a “GAN Product”) and (ii) under any intellectual property rights controlled by the Issuer or any of its affiliates with respect to such Exploitation (the “GAN Option”). Subject to certain extensions, the GAN Option is exercisable from the Effective Date through a specified period of time following Audentes’ receipt of (i) the formal minutes from the Type B end-of-Phase 2 meeting between the Issuer and the U.S. Food and Drug Administration (“FDA”) in response to the Issuer’s meeting request sent to the FDA on September 19, 2022 for the 120 GAN Product (the “Type B Meeting”), (ii) all written feedback from the FDA with respect to the Type B Meeting, and (iii) all briefing documents sent by the Issuer to the FDA with respect to the Type B Meeting.

Under the Option Agreement, the Issuer also granted to Audentes an exclusive option to obtain an exclusive, worldwide, royalty and milestone-bearing right and license (i) to Exploit any Rett Product (as defined below), and (ii) under any intellectual property rights controlled by the Issuer or any of its affiliates with respect to such Exploitation (the “Rett Option” and together with the GAN Option, each, an “Option”). Subject to certain extensions, the Rett Option is exercisable from the Effective Date through a specified period of time following Audentes’ receipt of (i) certain clinical data from the Issuer’s female pediatric trial and (ii) certain specified data and other information with respect to Rett Products (such period, the “Rett Option Period”) related to (a) the product known, as of the Effective Date, as TSHA-102 (the “102 Rett Product”) and any backup products with respect thereto for use in the treatment of Rett syndrome (“Rett”), and (b) any other gene therapy product for use in the treatment of Rett that is controlled by the Issuer or any of its affiliates or with respect to which the Issuer or any of its affiliates controls intellectual property rights covering the Exploitation thereof (each, a “Rett Product” and, together with GAN Product, the “Products”).

The parties have agreed that, if Audentes exercises an Option, the parties will, for a specified period, negotiate a license agreement in good faith on the terms and conditions outlined in the Option Agreement, including payments by Audentes of a to be determined upfront payment, certain to be determined milestone payments, and certain to be determined royalties on net sales of GAN Products or Rett Products, as applicable.

Monitoring Rights

During specified periods, the Issuer has agreed to (i) (a) deliver to Audentes certain written reports containing summaries of all material research, development, manufacturing and commercialization activities with respect to GAN Products (and provide more prompt notice of any new information related to the 120 GAN Product that is reasonably likely to materially impact the development or commercialization of the 120 GAN Product) and (b) deliver to Audentes certain written reports summarizing the Issuer’s progress with respect to a development plan and budget for the 102 Rett Product, including all material research, development, manufacturing and commercialization activities with respect to Rett Products, as well as the results of any clinical studies or material non-clinical studies (and provide more prompt notice of any new information related to the 102 Rett Product that is reasonably likely to materially impact the development or commercialization of the 102 Rett Product); and (ii) promptly notify Audentes of any meeting with the FDA with respect to the 120 GAN Product or 102 Rett Product. In addition, during specified periods, the Issuer has agreed to meet with Audentes and provide Audentes with additional information, in each case as reasonably requested by Audentes.

Furthermore, the Issuer has agreed to provide to Audentes (i) with respect to the GAN Option, certain diligence information with respect to the 120 GAN Product and certain information and materials relating to the Type B Meeting and (ii) with respect to the Rett Option, certain safety and efficacy data relating to the Female Pediatric Study (as defined in the Option Agreement) and a Rett Data Package (as defined in the Option Agreement) including, among other items, all material data with respect to Rett Products, detailed summaries thereof and information relating to intellectual property rights in Rett Products.

Finally, the Issuer has agreed to use commercially reasonable efforts to complete all activities set forth in a development plan relating to the 102 Rett Product attached to the Option Agreement in accordance therewith, including with a budget set forth therein. Audentes’ prior written consent is required for any material deviation from such development plan.

The rights described in this sub-section, together with the Board Observer right described below, are collectively referred to in this Statement as the “Monitoring Rights.”

Change of Control Rights

During the Rett Option Period, the Issuer has agreed to (i) not solicit or encourage any inquiries, offers or proposals for, or that could reasonably be expected to lead to, a Change of Control, or (ii) otherwise initiate a process for a potential Change of Control, in each case, without first notifying Audentes (a “ROFO Notice”) and offering Audentes the opportunity to submit an offer or proposal to the Issuer for a transaction that would result in a Change of Control. If Audentes fails or declines to submit any such offer within a specified period after the receipt of such ROFO Notice, the Issuer will have the ability to solicit third party bids for a Change of Control transaction. If Audentes delivers an offer to the Issuer for a transaction that would result in a Change of Control, the Issuer and Audentes will attempt to negotiate in good faith the potential terms and conditions for such potential transaction that would result in a Change of Control for a specified period, which period may be shortened or extended by mutual agreement.

In addition, if, during the Rett Option Period, at any time prior to the delivery of a ROFO Notice, the Issuer receives an offer or proposal for a transaction from a third party that would, or could reasonably be expected to, result in a Change of Control, the Issuer must promptly notify Audentes of the offer and, unless contractually prohibited, the terms thereof. If Audentes fails or declines to submit a competing offer within a specified period after the receipt of such notice, the Issuer will have the ability to pursue such third-party offer. However, if, during such pursuit, the terms of such third-party offer materially change, the Issuer must notify Audentes of such materially changed third-party offer and allow Audentes an additional specified period to consider such materially changed third-party offer.

During the Rett Option Period, the Issuer may not enter into (i) any letter of intent, agreement, contract or commitment (whether or not binding) with respect to a Change of Control or (ii) any agreement, contract or commitment that could impede the ability of Audentes to effect a Change of Control (a “Competing Instrument”), unless the Issuer promptly notifies Audentes at least five business days before entering into a Competing Instrument (which notice must include the terms thereof, unless the Issuer is contractually prohibited from disclosing them).

“Change of Control” is defined in the Option Agreement as (i) a consolidation, business combination, merger or similar transaction of the Issuer or any subsidiary with or into any other corporation or other entity or Person, or any other corporate reorganization; (ii) any transaction or series of related transactions in which 50% or more of the Issuer’s voting power is transferred or becomes beneficially owned by any person or group; or (iii) the sale or transfer of all or substantially all of the Issuer’s assets or any asset that is material to the Issuer and its subsidiaries, taken as a whole, or the exclusive license of substantially all of the Issuer’s intellectual property that is material to the Issuer and its subsidiaries, taken as a whole.

The rights described in this sub-section are collectively referred to in this Statement as the “Change of Control Rights.”

Consideration

As partial consideration for the rights granted to Audentes under the Option Agreement, Audentes will pay the Issuer a one-time payment in the amount of $20.0 million (the “Upfront Payment”) within 30 days after receipt of an invoice for such payment, which invoice will be delivered by the Issuer on or after the Effective Date. Audentes or any of its affiliates have the right, in its or their discretion and upon written notice to the Issuer, to offset the amount of the Upfront Payment (in whole or in part, until the full amount of the Upfront Payment has been offset) against (i) any payment(s) owed to the Issuer or any of its affiliates (or to any third party on behalf of the Issuer) under or in connection with any license agreement entered into with respect to any GAN Product or Rett Product, including, any upfront payment, milestone payment or royalties owed to the Issuer or any of its affiliates (or to any third party on behalf of the Issuer) under or in connection with any such license agreement or (ii) any amount owed to the Issuer or any of its affiliates in connection with a Change of Control transaction with Audentes or any of its affiliates. As further consideration for the rights granted to Audentes under the Option Agreement, the Issuer and Audentes also entered into the Securities Purchase Agreement.

The foregoing description of the Option Agreement does not purport to be complete and is qualified in its entirety by reference to such agreement, a copy of which is attached hereto as Exhibit 7 and incorporated into this Item 6 by reference.

Securities Purchase Agreement

On October 21, 2022, the Issuer and Audentes entered into the Securities Purchase Agreement, pursuant to which the Issuer agreed to issue and sell to Audentes in a private placement an aggregate of 7,266,342 shares of Common Stock of the Issuer (the “Shares”), for aggregate gross proceeds of approximately $30.0 million. The transaction closed on October 24, 2022 (the “Closing Date”). The Securities Purchase Agreement contains customary representations, warranties and agreements by the Issuer, customary conditions to closing, indemnification obligations of the Issuer, other obligations of the parties and termination provisions.

Pursuant to the Securities Purchase Agreement, the Purchaser may not, without the prior written consent of the Issuer, during the period commencing on the Closing Date and ending on the date that is 180 days after the Closing Date (i) lend, offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock; or (ii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any shares of Common Stock, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Common Stock or other securities, in cash or otherwise (the “Lock-up”). The Lock-up is subject to certain limited exceptions, including the ability to transfer shares to Audentes’ affiliates and certain related persons; provided the transferee agrees to be bound by such restrictions.

Pursuant to the Securities Purchase Agreement, Audentes has the right, effective as of the Closing Date, to designate one individual to attend all meetings of the board of directors in a non-voting observer capacity (the “Board Observer”). The Board Observer is entitled to all notices, minutes, consents and other materials provided to the Issuer’s directors at the same time and in the same manner as provided to such directors. The Board Observer right terminates upon a Change of Control (as defined in the Securities Purchase Agreement) or when Audentes no longer holds shares of Common Stock.

The foregoing description of the Securities Purchase Agreement does not purport to be complete and is qualified in its entirety by reference to such agreement, a copy of which is attached hereto as Exhibit 5 and incorporated into this Item 6 by reference.

Registration Rights Agreement

On October 21, 2022, the Issuer and Audentes entered into a registration rights agreement, attached hereto as Exhibit 6 (the “Registration Rights Agreement”), pursuant to which the Issuer agreed to register the resale of the Shares. Under the Registration Rights Agreement, the Issuer has agreed to file a registration statement covering the resale of the Shares no later than April 24, 2023 (the “Filing Deadline”). The Issuer has agreed to use reasonable

best efforts to cause such registration statement to become effective as promptly as practicable after the filing thereof but in any event on or prior to the Effectiveness Deadline (as defined in the Registration Rights Agreement), and to keep such registration statement continuously effective until the earlier of (i) the date the Shares covered by such registration statement have been sold or may be resold pursuant to Rule 144 without restriction, or (ii) the date that is three (3) years following the Closing Date. The Issuer has also agreed, among other things, to pay all reasonable fees and expenses (excluding any underwriters’ discounts and commissions and all fees and expenses of legal counsel, accountants and other advisors for Audentes except as specifically provided in the Registration Rights Agreement) incident to the performance of or compliance with the Registration Rights Agreement by the Issuer.

The Issuer and Audentes granted each other customary indemnification rights in connection with the registration statement. The Issuer made additional customary covenants, including with respect to “piggyback” registrations, cooperating in underwritten offerings of the Shares and taking steps to allow the Shares to be resold pursuant to Rule 144 under the Securities Act of 1933.

The foregoing description of the Registration Rights Agreement does not purport to be complete and is qualified in its entirety by reference to such agreement, a copy of which is attached hereto as Exhibit 6 and incorporated into this Item 6 by reference.

SIGNATURE

After reasonable inquiry and to the best of each of the undersigned’s knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Schedule I

Astellas Pharma Inc.

The name and present principal occupation of each of the executive officers and directors of Astellas Pharma Inc. are set forth below. Unless otherwise noted, each of these persons has as their business address 2-5-1, Nihonbashi-Honcho, Chuo-Ku, Tokyo 103-8411, Japan.

Astellas US Holding, Inc.

The name and present principal occupation of each of the executive officers and directors of Astellas US Holding, Inc. are set forth below. Unless otherwise noted, each of these persons has as their business address 1 Astellas Way, Northbrook, IL 60062.

Audentes Therapeutics, Inc.

The name and present principal occupation of each of the executive officers and directors of Audentes Therapeutics, Inc. are set forth below. Unless otherwise noted, each of these persons has as their business address 600 California Street, 17th Floor, San Francisco, CA 94108.

EXHIBIT 1

POWER OF ATTORNEY

Know all by these presents, that Astellas Pharma Inc. (the “Company”) hereby constitutes and appoints each of Chad Diehl and Lujing Liu, or either of them signing singly, and with full power of substitution, the Company’s true and lawful attorney-in-fact to:

(1) prepare, execute in the Company’s name and on the Company’s behalf, and submit to the U.S. Securities and Exchange Commission (the “SEC”) a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the Company to make electronic filings with the SEC of reports required by Sections 13 or 16(a) of the Securities Exchange Act of 1934 (the “Exchange Act”) or any rule or regulation of the SEC;

(2) prepare, execute in the Company’s name and on the Company’s behalf, and submit to the SEC (i) beneficial ownership reports on Schedule 13D or 13G, in accordance with Section 13 of the Exchange Act and the rules thereunder, (ii) Forms 3, 4, and 5, in accordance with Section 16(a) of the Exchange Act and the rules thereunder and (iii) Forms 144, in accordance with the Securities Act of 1933 (the “Securities Act”) and the rules thereunder (collectively, the “Covered Forms”);

(3) do and perform any and all acts for and on behalf of the Company which may be necessary or desirable to complete and execute any Covered Form, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any stock exchange or similar authority; and

(4) take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the Company, it being understood that the documents executed by such attorney-in-fact on behalf of the Company pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.

The Company hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The Company acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the Company, are not assuming any of the Company’s responsibilities to comply with Sections 13 or 16 of the Exchange Act or the provisions of the Securities Act. This Power of Attorney shall remain in full force and effect for a period of five (5) years from the date hereof, unless earlier revoked by the Company in a signed writing delivered to the foregoing attorneys-in-fact.

[Signature Page Follows]

IN WITNESS WHEREOF, the Company has caused this Power of Attorney to be executed as of this 28th day of October, 2022.

EXHIBIT 2

POWER OF ATTORNEY

Know all by these presents, that Astellas US Holding, Inc. (the “Company”) hereby constitutes and appoints each of Chad Diehl and Lujing Liu, or either of them signing singly, and with full power of substitution, the Company’s true and lawful attorney-in-fact to:

(1) prepare, execute in the Company’s name and on the Company’s behalf, and submit to the U.S. Securities and Exchange Commission (the “SEC”) a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the Company to make electronic filings with the SEC of reports required by Sections 13 or 16(a) of the Securities Exchange Act of 1934 (the “Exchange Act”) or any rule or regulation of the SEC;

(2) prepare, execute in the Company’s name and on the Company’s behalf, and submit to the SEC (i) beneficial ownership reports on Schedule 13D or 13G, in accordance with Section 13 of the Exchange Act and the rules thereunder, (ii) Forms 3, 4, and 5, in accordance with Section 16(a) of the Exchange Act and the rules thereunder and (iii) Forms 144, in accordance with the Securities Act of 1933 (the “Securities Act”) and the rules thereunder (collectively, the “Covered Forms”);

(3) do and perform any and all acts for and on behalf of the Company which may be necessary or desirable to complete and execute any Covered Form, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any stock exchange or similar authority; and

(4) take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the Company, it being understood that the documents executed by such attorney-in-fact on behalf of the Company pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.

The Company hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The Company acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the Company, are not assuming any of the Company’s responsibilities to comply with Sections 13 or 16 of the Exchange Act or the provisions of the Securities Act. This Power of Attorney shall remain in full force and effect for a period of five (5) years from the date hereof, unless earlier revoked by the Company in a signed writing delivered to the foregoing attorneys-in-fact.

[Signature Page Follows]

IN WITNESS WHEREOF, the Company has caused this Power of Attorney to be executed as of this 26th day of October, 2022.

EXHIBIT 3

POWER OF ATTORNEY

Know all by these presents, that Audentes Therapeutics, Inc. (the “Company”) hereby constitutes and appoints each of Chad Diehl and Lujing Liu, or either of them signing singly, and with full power of substitution, the Company’s true and lawful attorney-in-fact to:

(1) prepare, execute in the Company’s name and on the Company’s behalf, and submit to the U.S. Securities and Exchange Commission (the “SEC”) a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the Company to make electronic filings with the SEC of reports required by Sections 13 or 16(a) of the Securities Exchange Act of 1934 (the “Exchange Act”) or any rule or regulation of the SEC;

(2) prepare, execute in the Company’s name and on the Company’s behalf, and submit to the SEC (i) beneficial ownership reports on Schedule 13D or 13G, in accordance with Section 13 of the Exchange Act and the rules thereunder, (ii) Forms 3, 4, and 5, in accordance with Section 16(a) of the Exchange Act and the rules thereunder and (iii) Forms 144, in accordance with the Securities Act of 1933 (the “Securities Act”) and the rules thereunder (collectively, the “Covered Forms”);

(3) do and perform any and all acts for and on behalf of the Company which may be necessary or desirable to complete and execute any Covered Form, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any stock exchange or similar authority; and

(4) take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the Company, it being understood that the documents executed by such attorney-in-fact on behalf of the Company pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.

The Company hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The Company acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the Company, are not assuming any of the Company’s responsibilities to comply with Sections 13 or 16 of the Exchange Act or the provisions of the Securities Act. This Power of Attorney shall remain in full force and effect for a period of five (5) years from the date hereof, unless earlier revoked by the Company in a signed writing delivered to the foregoing attorneys-in-fact.

[Signature Page Follows]

IN WITNESS WHEREOF, the Company has caused this Power of Attorney to be executed as of this 26th day of October, 2022.

EXHIBIT 4

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him, her or it contained herein, but shall not be responsible for the completeness and accuracy of the information concerning the other entities or persons, except to the extent that he, she or it knows or has reason to believe that such information is inaccurate.