Serpina1 iRNA compositions and methods of use thereof

1. A double stranded ribonucleic acid (dsRNA) agent for inhibiting expression of a serine peptidase inhibitor, clade A member 1 (Serpina1) in a cell, wherein said dsRNA agent comprises a sense strand and an antisense strand, said antisense strand comprising a region of complementarity to an mRNA encoding Serpina1, wherein the region of complementarity comprises at least 15 contiguous nucleotides differing by no more than 3 nucleotides from the nucleotide sequence of 5′-GGUGAGUUCAUUUUCCAGGUGCU 3′ (SEQ ID NO:143),

wherein each strand is independently 14-30 nucleotides in length,

wherein substantially all of the nucleotides of said sense strand and substantially all of the nucleotides of said antisense strand are modified nucleotides, and

wherein said sense strand is conjugated to a ligand attached at the 3′-terminus.

2. A double stranded ribonucleic acid (dsRNA) agent for inhibiting the expression of a serine peptidase inhibitor, clade A member 1 (Serpina1) in a cell, wherein said dsRNA agent comprises a sense strand substantially complementary to an antisense strand, wherein said antisense strand comprises a region of complementarity to an mRNA encoding Serpina1, wherein the region of complementarity comprises at least 15 contiguous nucleotides differing by no more than 3 nucleotides from any one of the nucleotide sequence of 5′-GGUGAGUUCAUUUUCCAGGUGCU-3′ (SEQ ID NO:143), wherein each strand is about 14 to about 30 nucleotides in length, wherein said dsRNA agent is represented by formula (III):

(III)

sense:

5′ n p -N a -(X X X) i -N b -Y Y Y-N b -(Z Z Z) j -N a -n q  3′

antisense:

3′ n p ′-N a ′-(X′X′X′) k -N b ′-Y′Y′Y′-N b ′-(Z′Z′Z′) l -N a ′-

n q ′ 5′

wherein:

j, k, and l are each independently 0 or 1;

p, p′, q, and q′ are each independently 0-6;

each N a and N a ′ independently represents an oligonucleotide sequence comprising 0-25 nucleotides which are either modified or unmodified or combinations thereof, each sequence comprising at least two differently modified nucleotides;

each N b and N b ′ independently represents an oligonucleotide sequence comprising 0-10 nucleotides which are either modified or unmodified or combinations thereof;

each n p , n p ′, n q , and n q ′, each of which may or may not be present, independently represents an overhang nucleotide;

XXX, YYY, ZZZ, X′X′X′, Y′Y′Y′, and Z′Z′Z′ each independently represent one motif of three identical modifications on three consecutive nucleotides;

modifications on N b differ from the modification on Y and modifications on N b ′ differ from the modification on Y′; and

wherein the sense strand is conjugated to at least one ligand.

3. The dsRNA agent of claim 1 or 2 , wherein the ligand is one or more GalNAc derivatives attached through a bivalent or trivalent branched linker.

4. The dsRNA agent of claim 1 or 2 , wherein said agent further comprises at least one phosphorothioate or methylphosphonate internucleotide linkage.

5. The dsRNA agent of claim 2 , wherein the Y nucleotides contain a 2′-fluoro modification.

6. The dsRNA agent of claim 2 , wherein the Y′ nucleotides contain a 2′-O-methyl modification.

7. A pharmaceutical composition comprising the dsRNA agent of claim 1 .

8. The dsRNA agent of claim 1 , wherein all of the nucleotides of said sense strand and all of the nucleotides of said antisense strand are modified nucleotides.

9. The dsRNA agent of claim 1 , wherein at least one of said modified nucleotides is selected from the group consisting of a 3′-terminal deoxy-thymine (dT) nucleotide, a 2′-O-methyl modified nucleotide, a 2′-fluoro modified nucleotide, a 2′-deoxy-modified nucleotide, a locked nucleotide, an abasic nucleotide, a 2′-amino-modified nucleotide, a 2′-alkyl-modified nucleotide, a morpholino nucleotide, a phosphoramidate, a non-natural base comprising nucleotide, a nucleotide comprising a 5′-phosphorothioate group, and a terminal nucleotide linked to a cholesteryl derivative or a dodecanoic acid bisdecylamide group.

10. The dsRNA agent of any claim 1 , wherein at least one strand comprises a 3′ overhang of at least 1 nucleotide; or a 3′ overhang of at least 2 nucleotides.

11. The dsRNA agent of claim 1 or 2 , wherein each of the sense strand and the antisense strand is independently 21 to 23 nucleotides in length.

12. The dsRNA agent of claim 1 or 2 , wherein each strand is independently 19-25 nucleotides in length.

13. The dsRNA agent of claim 3 , wherein the ligand is

14. The dsRNA agent of claim 13 , wherein the dsRNA agent is conjugated to the ligand as shown in the following schematic

and, wherein X is O or S.

15. The dsRNA agent of claim 14 , wherein the X is O.

16. The dsRNA agent of claim 1 or 2 , wherein the region of complementarity consists of the nucleotide sequence 5′-GGUGAGUUCAUUUUCCAGGUGCU-3′ (SEQ ID NO:143).

17. The dsRNA agent of claim 1 or 2 , wherein the sense strand comprises the nucleotide sequence 5′-CACCUGGAAAAUGAACUCACC-3′ (SEQ ID NO:55) and the antisense strand comprises the nucleotide sequence 5′-GGUGAGUUCAUUUUCCAGGUGCU-3′ (SEQ ID NO:143).

18. The dsRNA agent of claim 1 or 2 , wherein the sense strand comprises the nucleotide sequence 5′-CfsasCfcUfgGfaAfAfAfuGfaAfcUfcAfcCf-3′ (SEQ ID NO:231) and the antisense strand comprises the nucleotide sequence 5′-gsGfsuGfaGfuUfcAfuuuUfcCfaGfgUfgscsu-3′ (SEQ ID NOG 19), wherein a, g, c, and u are 2′-0-methyl (2′-OMe) A, G, C, and U, respectively; Af, Gf, Cf, and Uf, are 2′-fluoro A, G, C, and U, respectively; and s is a phosphorothioate linkage.

19. The dsRNA agent of claim 1 or 2 , wherein the sense strand consists of the nucleotide sequence 5′-CfsasCfcUfgGfaAfAfAfuGfaAfcUfcAfcCf-3′ (SEQ ID NO:231) and the antisense strand consists of the nucleotide sequence 5′-gsGfsuGfaGfuUfcAfuuuUfcCfaGfgUfgscsu-3′ (SEQ ID NOG 19), wherein a, g, c, and u are 2′-0-methyl (2′-OMe) A, G, C, and U, respectively; Af, Gf, Cf, and Uf, are 2′-fluoro A, G, C, and U, respectively; and s is a phosphorothioate linkage.

20. The dsRNA agent of claim 1 or 2 , wherein the sense strand is 21 nucleotides in length and the antisense strand is 23 nucleotides in length.

21. A pharmaceutical composition comprising the dsRNA agent of claim 2 .

22. A method of inhibiting Serpinal expression in a cell, the method comprising:

(a) contacting the cell with the dsRNA agent of claim 1 or 2 , or the pharmaceutical composition of claim 7 or 21 ; and

(b) maintaining the cell produced in step (a) for a time sufficient to obtain degradation of the mRNA transcript of a Serpinal gene, thereby inhibiting expression of the Serpinal gene in the cell.

23. The method of claim 22 , wherein the cell is within a subject.

24. A method of treating a subject having a Serpinal deficiency variant-associated associated disease, comprising administering to the subject a therapeutically effective amount of the dsRNA agent of claim 1 or 2 , or the pharmaceutical composition of claim 7 or 21 , thereby treating said subject.

25. The method of claim 24 , wherein the subject is a human.

26. The method of claim 24 , wherein the Serpinal associated disease is a liver disorder.

27. A method of treating a subject having a Serpinal deficiency variant-associated disorder to reduce the progression of the liver disorder to hepatocellular carcinoma, comprising administering to the subject a therapeutically effective amount of the dsRNA agent of claim 1 or 2 , or the pharmaceutical composition of claim 7 or 21 , thereby treating the subject.

28. A method of reducing the accumulation of misfolded Serpinal in the liver of a subject having a Serpinal deficiency variant-associated disorder, comprising administering to the subject a therapeutically effective amount of the dsRNA agent of claim 1 or 2 , or the pharmaceutical composition of claim 7 or 21 , thereby reducing the accumulation of misfolded Serpinal in the liver of the subject.