The present invention is related to a ribonucleic acid comprising a double stranded structure whereby the double-stranded structure comprises a first strand and a second strand, whereby the first strand comprises a first stretch of contiguous nucleotides and whereby said first stretch is at least partially complementary to a target nucleic acid, and the second strand comprises a second stretch of contiguous nucleotides whereby said second stretch is at least partially identical to a target nucleic acid, and whereby the double stranded structure is blunt ended.

Aspects of the disclosure relate to complexes comprising a muscle-targeting agent covalently linked to a molecular payload. In some embodiments, the muscle-targeting agent specifically binds to an internalizing cell surface receptor on muscle cells. In some embodiments, the molecular payload inhibits expression or activity of DUX4. In some embodiments, the molecular payload is an oligonucleotide, such as an antisense oligonucleotide or RNAi oligonucleotide.

One aspect of the present invention relates to double-stranded RNAi (dsRNA) duplex agent capable of inhibiting the expression of a target gene. The dsRNA duplex comprises one or more motifs of three identical modifications on three consecutive nucleotides in one or both strand, particularly at or near the cleavage site of the strand. Other aspects of the invention relates to pharmaceutical compositions comprising these dsRNA agents suitable for therapeutic use, and methods of inhibiting the expression of a target gene by administering these dsRNA agents, e.g., for the treatment of various disease conditions.

The invention relates to RNAi agents, e.g., double-stranded RNAi agents, targeting the PCSK9 gene, and methods of using such RNAi agents to inhibit expression of PCSK9 and methods of treating subjects having a lipid disorder, such as a hyperlipidemia.

The present invention provides oligomeric compounds. Certain such oligomeric compounds are useful for hybridizing to a complementary nucleic acid, including but not limited, to nucleic acids in a cell. In certain embodiments, hybridization results in modulation of the amount activity or expression of the target nucleic acid in a cell.

The present invention relates to nucleic acids for inhibiting expression of a target gene in a cell, comprising at least one duplex region that comprises at least a portion of a first strand and at least a portion of a second strand that is at least partially complementary to the first strand, wherein said first strand is at least partially complementary to at least a portion of RNA transcribed from said target gene to be inhibited. The first strand of the nucleic acid has a terminal 5′ (E)-vinylphosphonate nucleotide that is linked to the second nucleotide in the first strand by a phosphodiester linkage.

Described are RNAi agents, compositions that include RNAi agents, and methods for inhibition of a beta-ENaC (SCNN1B) gene. The beta-ENaC RNAi agents and RNAi agent conjugates disclosed herein inhibit the expression of a beta-ENaC gene. Pharmaceutical compositions that include one or more beta-ENaC RNAi agents, optionally with one or more additional therapeutics, are also described. Delivery of the described beta-ENaC RNAi agents to epithelial cells, such as pulmonary epithelial cells, in vivo, provides for inhibition of beta-ENaC gene expression and a reduction in ENaC activity, which can provide a therapeutic benefit to subjects, including human subjects, for the treatment of various diseases including chronic obstructive pulmonary disease (COPD).

The present invention provides RNAi agents, e.g., double stranded RNAi agents, that target the transthyretin (TTR) gene and methods of using such RNAi agents for treating or preventing TTR-associated diseases.

Described are RNAi agents, compositions that include RNAi agents, and methods for inhibition of a Mucin 5AC (MUC5AC) gene. The MUC5AC RNAi agents and RNAi agent conjugates disclosed herein inhibit the expression of an MUC5AC gene. Pharmaceutical compositions that include one or more MUC5AC RNAi agents, optionally with one or more additional therapeutics, are also described. Delivery of the described MUC5AC RNAi agents to pulmonary epithelial cells, in vivo, provides for inhibition of MUC5AC gene expression and a reduction in MUC5AC production, which can provide a therapeutic benefit to subjects, including human subjects, for the treatment of various diseases including mucoobstructive lung disease such as severe asthma and various cancers.

The present disclosure relates to RNAi agents, e.g., double stranded RNAi agents, able to inhibit xanthine dehydrogenase (XDH) gene expression. Also disclosed are pharmaceutical compositions that include XDH RNAi agents and methods of use thereof. The XDH RNAi agents disclosed herein may be conjugated to targeting ligands to facilitate the delivery to cells, including to hepatocytes. Delivery of the XDH RNAi agents in vivo provides for inhibition of XDH gene expression. The RNAi agents can be used in methods of treatment of diseases, disorders, or symptoms mediated in part by XDH gene expression, such as gout and hyperuricemia.