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Oligonucleotide Therapeutics lists antisense oligonucleotides and small interfering RNAs that reduce or modify gene expression. Each antisense oligonucleotide (ASO) binds complementary RNA and, depending on its chemistry, triggers ribonuclease H (RNase H) cleavage, alters splicing or blocks translation. Antisense examples include eteplirsen, a phosphorodiamidate morpholino oligomer, and danvatirsen, which is directed at signal transducer and activator of transcription 3 (STAT3). Each small interfering RNA (siRNA) is a short double-stranded RNA that guides the RNA-induced silencing complex (RISC) to cleave a matching messenger RNA (mRNA). Inclisiran, for example, is an siRNA directed at proprotein convertase subtilisin/kexin type 9 (PCSK9). Phosphoramidite building blocks for oligonucleotide synthesis are listed separately under Phosphoramidites.
