Cited by 327RNA Interference and Gene DeliveryDNA and Nucleic Acid ChemistryRNA and protein synthesis mechanisms

Advanced siRNA Designs Further Improve In Vivo Performance of GalNAc-siRNA Conjugates

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Foster, Donald J., Brown, Christopher R., Shaikh, Sarfraz, Trapp, Casey, Schlegel, Mark K., Qian, Kun, Sehgal, Alfica, Rajeev, Kallanthottathil G. +5 more·2018·Molecular Therapy

Abstract

Significant progress has been made in the advancement of RNAi therapeutics by combining a synthetic triantennary N-acetylgalactosamine ligand targeting the asialoglycoprotein receptor with chemically modified small interfering RNA (siRNA) designs, including the recently described Enhanced Stabilization Chemistry. This strategy has demonstrated robust RNAi-mediated gene silencing in liver after subcutaneous administration across species, including human. Here we demonstrate that substantial efficacy improvements can be achieved through further refinement of siRNA chemistry, optimizing the positioning of 2'-deoxy-2'-fluoro and 2'-O-methyl ribosugar modifications across both strands of the double-stranded siRNA duplex to enhance stability without compromising intrinsic RNAi activity. To achieve this, we employed an iterative screening approach across multiple siRNAs to arrive at advanced designs with low 2'-deoxy-2'-fluoro content that yield significantly improved potency and duration in preclinical species, including non-human primate. Liver exposure data indicate that the improvement in potency is predominantly due to increased metabolic stability of the siRNA conjugates.

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Crossref · 10.1016/j.ymthe.2017.12.021

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  • The naturally occurring RNAi pathway can be harnessed in extrahepatic organs by building on nearly two decades of liver siRNA design optimization, but novel delivery approaches are needed.

    “The naturally occurring RNAi pathway can also be harnessed in extrahepatic organs by building on nearly two decades of efforts on liver siRNA design optimization [9][10][11][12] ; however, novel delivery approaches are needed.”

    From Expanding RNAi therapeutics to extrahepatic tissues with lipophilic conjugates (2022) · cites this paper as [9]

    The Introduction states that synthetic siRNAs harness the endogenous RNAi pathway and describes targeted delivery to hepatocytes; the Discussion describes further optimization of siRNA designs. The paper does not establish that these designs can be used in extrahepatic organs or state that novel delivery approaches are needed for them. No page numbers are available in our copy. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Full chemical modification with strategic placement of 2'-fluoro and 2'-O-methyl modifications is required for robust siRNA activity in the CNS.

    “Next, we evaluated other siRNA design elements and con rmed that full chemical modi cation with strategic placement of 2'-uoro and 2'-O-methyl modi cations 9 is required for robust siRNA activity in the CNS.”

    From Expanding RNAi therapeutics to extrahepatic tissues with lipophilic conjugates (2022) · cites this paper as [9]

    The Introduction and Results (page unavailable) describe fully 2′-F/2′-OMe-modified GalNAc-siRNAs and show that modification placement affects activity. But the in vivo experiments measured silencing in liver, not the CNS, and the paper does not establish that full chemical modification is required for robust CNS activity. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • 2'-O-C16 was well tolerated across both sense and antisense strands, with potency similar to the unconjugated siRNA, except for a few positions known to be sensitive to sterically demanding 2'-modifications.

    “2'-O-C16 was well tolerated across both strands, with potency similar to the unconjugated siRNA, except for a few positions known to be sensitive to sterically demanding 2'-modi cations 9 .”

    From Expanding RNAi therapeutics to extrahepatic tissues with lipophilic conjugates (2022) · cites this paper as [9]

    The Introduction and Results describe how sterically demanding 2′ modifications can reduce RNAi activity at particular positions in the sense and antisense strands. But the paper examines 2′-OMe and 2′-F, not 2′-O-C16; it does not establish that 2′-O-C16 was tolerated across both strands or had potency similar to unconjugated siRNA. Page numbers are unavailable in our copy. (LLM, conf=0.79)

    Experimental — accuracy not yet measured

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Authors
Foster, D. J., Brown, C. R., Shaikh, S., Trapp, C., Schlegel, M. K., Qian, K., Sehgal, A., Rajeev, K. G., Jadhav, V., Manoharan, M., Kuchimanchi, S., Maier, M. A., & Milstein, S.
Affiliations
Alnylam Pharmaceuticals (United States) (US)
Corresponding author
Milstein, Stuart
Venue
Molecular Therapy
Publisher
Elsevier BV
Published
2018-03
Volume
26
Issue
3
Pages
708-717
ISSN
1525-0016 (ISSN-L)
OpenAlex
W2781906140
Cited by
325
References
32
Citations by year
2026: 41 · 2025: 46 · 2024: 49 · 2023: 34 · 2022: 34 · 2021: 37 · 2020: 43 · 2019: 24 · 2018: 17
FWCI
10.76
Type
journal article
Language
en
Open access
Locations
  • Molecular Therapy (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
Keywords
siRNA design, RNAi therapeutics, asialoglycoprotein receptor, siRNA stability, non-human primates, subcutaneous administration
MeSH terms
Acetylgalactosamine, Animals, Gene Expression Regulation, Liver, Male, Mice, Transgenic, RNA, Messenger, Gene Silencing, Hepatocytes, RNA Interference, RNA, Small Interfering, Mice, Argonaute Proteins

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