UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. 1)

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¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to §240.14a-12

Dicerna Pharmaceuticals, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on June 14, 2016
	DICERNA PHARMACEUTICALS, INC.	Meeting Information
		Meeting Type:  Annual Meeting
		For holders as of: April 19, 2016
		Date: June 14, 2016            Time: 9:00 AM EST
		Location:	The Ocean House  1 Bluff Avenue  Watch Hill, RI 02891
		You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting.
		See the reverse side of this notice to obtain proxy materials  and voting instructions.

—  Before You Vote  —

How to Access the Proxy Materials

	Proxy Materials Available to VIEW or RECEIVE:
	1. Notice & Proxy Statement         2. Form 10-K
	How to View Online: Have the information that is printed in the box marked by the arrow       (located on the following page) and visit: www.proxyvote.com.
	How to Request and Receive a PAPER or E-MAIL Copy:
	If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:
	1) BY INTERNET:	www.proxyvote.com
	2) BY TELEPHONE:	1-800-579-1639
	3) BY E-MAIL*:	sendmaterial@proxyvote.com
	*  If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow       (located on the following page) in the subject line.
	Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 31, 2016 to facilitate timely delivery.
	—  How To Vote  — Please Choose One of the Following Voting Methods
	Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow       available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

	Voting items
	The Board of Directors recommends you vote FOR the following:
	1.    Election of Directors
	Nominees
	1a    Douglas M. Fambrough
	1b    Brian K. Halak
	1c    Stephen J. Hoffman
	1d    Peter Kolchinsky
	1e    Dennis H. Langer
	1f     David M. Madden
	1g    Bruce Peacock
	The Board of Directors recommends you vote FOR the following proposal:
	2     To ratify the selection of Deloitte &        Touche LLP as our independent registered        public accounting firm for the fiscal        year ending December 31, 2016
	NOTE: Such other business as may properly come before the meeting or any adjournment thereof.

Reserved for Broadridge Internal Control Information       

NAME
THE COMPANY NAME INC. - COMMON	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS A	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS B	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS C	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS D	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS E	123,456,789,012.12345
THE COMPANY NAME INC. - CLASS F	123,456,789,012.12345
THE COMPANY NAME INC. - 401 K	123,456,789,012.12345

		Broadridge Internal Use Only Job # Envelope # Sequence # # of # Sequence #
	THIS SPACE RESERVED FOR SIGNATURES IF APPLICABLE