Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
RA CAPITAL MANAGEMENT, LLC
   2. Issuer Name and Ticker or Trading Symbol
Dicerna Pharmaceuticals Inc [DRNA] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
P.Kolchinsky is a director.
(Last)
(First)
(Middle)
C/O RA CAPITAL MANAGEMENT LLC, 20 PARK PLAZA, SUITE 1200		 3. Date of Earliest Transaction (Month/Day/Year)
04/16/2014
(Street)

BOSTON, MA 02116		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Director Stock Option (right to buy) $ 16.3 04/16/2014   A   25,000     (2) 04/16/2024 Common Stock 25,000 $ 0 25,000 (1) I See Footnotes (3) (4)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
RA CAPITAL MANAGEMENT, LLC
C/O RA CAPITAL MANAGEMENT LLC
20 PARK PLAZA, SUITE 1200
BOSTON, MA 02116		     X   P.Kolchinsky is a director.
Kolchinsky Peter
C/O RA CAPITAL MANAGEMENT, LLC
20 PARK PLAZA, SUITE 1200
BOSTON, MA 02116		   X   X   P.Kolchinsky is a director.
RA Capital Healthcare Fund LP
C/O RA CAPITAL MANAGEMENT, LLC
20 PARK PLAZA, SUITE 1200
BOSTON, MA 02116		     X   P.Kolchinsky is a director.

Signatures

 /s/ Peter Kolchinsky Peter Kolchinsky, Manager of RA Capital Management, LLC   04/21/2014
**Signature of Reporting Person Date
 /s/ Peter Kolchinsky Peter Kolchinsky, individually   04/21/2014
**Signature of Reporting Person Date
 /s/ Peter Kolchinsky Peter Kolchinsky, Manager of RA Capital Management, LLC, the General Partner of RA Capital Healthcare Fund, L.P.   04/21/2014
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The options awarded include 20,750 shares for RA Capital Healthcare Fund, L.P. (the "Fund") and 4,250 shares for an account owned by Blackwell Partners, LLC (the "Blackwell Account").
(2) The option vests as to one-third of the underlying shares on January 30, 2015 and as to the remaining two-thirds of the shares in eight quarterly installments thereafter, subject in each case to the reporting person's continued service with the issuer though the applicable vesting date.
(3) RA Capital Management, LLC (the "Adviser") is the general partner of the Fund and the investment adviser of the Blackwell Account. Peter Kolchinsky is the sole manager of the Adviser. In their respective capacities, each of Mr. Kolchinsky and the Adviser may be deemed to beneficially own the reported securities. In addition, Mr. Kolchinsky is a director of the Issuer.
(4) Pursuant to Rule 16a-1 under the Securities Exchange Act of 1934, as amended (the "Act"), each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of their respective pecuniary interests therein. The filing of this Form 4 shall not be construed as an admission that Mr. Kolchinsky or the Adviser is or was for the purposes of Section 16(a) of the Act, or otherwise, the beneficial owner of any of securities reported herein.

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