Evaluation of the effect of 2′-O-methyl,fluoro hexitol,bicyclo and Morpholino nucleic acid modifications on potency of GalNAc conjugated antisense oligonucleotides in mice |
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Authors: | Thazha P Prakash Jinghua Yu Garth A Kinberger Audrey Low Michaela Jackson Frank Rigo Eric E Swayze Punit P Seth |
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Institution: | Ionis Pharmaceuticals, Inc., 2855 Gazelle Ct., Carlsbad, CA 92010, United States |
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Abstract: | The potency of antisense oligonucleotide (ASO) drugs has significantly improved in the clinic after exploiting asialoglycoprotein receptor (ASGR) mediated delivery to hepatocytes. To further this technology, we evaluated the structure–activity relationships of oligonucleotide chemistry on in vivo potency of GalNAc-conjugated Gapmer ASOs. GalNAc conjugation improved potency of ASOs containing 2′-O-methyl (2′-O-Me), 3′-fluoro hexitol nucleic acid (FHNA), locked nucleic acid (LNA), and constrained ethyl bicyclo nucleic acid (cEt BNA) 10–20-fold compared to unconjugated ASOs. We further demonstrate that GalNAc conjugation improves activity of 2′-O-(2-methoxyethyl) (2′-O-MOE) and Morpholino ASOs designed to correct splicing of survival motor neuron (SMN2) pre-mRNA in liver after subcutaneous administration. GalNAc modification thus represents a viable strategy for enhancing potency of ASO with diverse nucleic acid modifications and mechanisms of action for targets expressed in hepatocytes. |
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Keywords: | GalNAc FHNA Gapmer ASO Morpholin ASO cEt BNA Gapmer ASO LNA Gapmer ASO Mixed wing Gapmer ASO |
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