The present invention relates to a novel method for stabilizing nucleic acid nanostructures by curing with ultraviolet light, particularly by crosslinking pyrimidine nucleotides.

A method of reducing the level of a transcription product in a cell comprising contacting with the cell a composition comprising a double-stranded nucleic acid complex comprising a first nucleic acid strand annealed to a second nucleic acid strand, wherein: (i) the first nucleic acid strand hybridizes to the transcription product and comprises (a) a region consisting of at least 4 consecutive nucleotides that are recognized by RNase H when the strand is hybridized to the transcription product, (b) one or more nucleotide analogs located on 5′ terminal side of the region, (c) one or more nucleotide analogs located on 3′ terminal side of the region and (d) a total number of nucleotides and nucleotide analogs ranging from 8 to 35 nucleotides and (ii) the second nucleic acid strand comprises (a) nucleotides and optionally nucleotide analogs and (b) at least 4 consecutive RNA nucleotides.

Disclosed are compositions and methods related to RNA interference (RNAi) and the use of RNAi active sequence for treating diseases and disorders. Particular disclosed are toxic RNAi active sequences such as siRNA and shRNA for killing cancer cells. The disclosed toxic RNAi active sequences typically include trinucleotide repeats and preferentially target the expression of multiple essential genes for cell survival and/or growth.

The present disclosure provides compositions and methods for regulating gene expression via RNA-mediated silencing. The present disclosure also provides compositions and methods to optimize the processing of a dsRNA molecule into small RNA duplexes. The present disclosure further provides compositions and methods to improve the efficiency of a dsRNA molecule in producing desired small RNAs and promoting the silencing of a gene of interest.

The present invention provides an antisense nucleic acid medicine that can modulate expression of a target transcriptional product in an ischemic site of a subject. The present invention also provides a composition for modulating expression of a target transcriptional product in an ischemic site of a subject, having a nucleic acid complex formed by annealing together a first nucleic acid strand having an antisense oligonucleotide region with respect to the target transcriptional product, and a lipid-conjugated second nucleic acid strand having a complementary region that is complementary to at least part of the first nucleic acid strand.

The present invention in general relates to an improved RNA transcription vector, which is very suitable for the production of mRNA for in vivo therapeutic purposes. The improvements in the vector in particular reside in the presence of a transcription enhancer and a nuclear retention element.

The present disclosure provides compositions comprising an antisense oligonucleotide and one or more excipients that modulates viscosity, turbidity or both viscosity and turbidity. In certain embodiments, compositions comprising an antisense oligonucleotide and one or more excipients having low viscosity are provided. In certain embodiments, compositions comprising an antisense oligonucleotide and one or more excipients having low turbidity are provided. In certain embodiments, pharmaceutical compositions comprising an antisense oligonucleotide and one or more excipients having low viscosity and turbidity are provided.

The present disclosure provides compositions comprising an antisense oligonucleotide and one or more excipients that modulates viscosity, turbidity or both viscosity and turbidity. In certain embodiments, compositions comprising an antisense oligonucleotide and one or more excipients having low viscosity are provided. In certain embodiments, compositions comprising an antisense oligonucleotide and one or more excipients having low turbidity are provided. In certain embodiments, pharmaceutical compositions comprising an antisense oligonucleotide and one or more excipients having low viscosity and turbidity are provided.

One aspect of the present invention relates to double-stranded RNA (dsRNA) agent capable of inhibiting the expression of a target gene. The sense strand of the dsRNA agent comprises at least one thermally destabilizing nucleotide, and at least one said thermally destabilizing nucleotide occurring at a site opposite to the seed region (positions 2-8) of the antisense strand; and the antisense strand of the dsRNA agent comprises at least two modified nucleotides that provide the nucleotide a steric bulk that is less than or equal to the steric bulk of a 2-OMe modification, wherein said modified nucleotides are separated by 11 nucleotides in length. 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 proves an oligonucleotide comprising one or more carboxylated 2-amino-LNA nucleotide units. The invention also provides a method of transfecting cells with the oligonucleotide, a method of treating a human or animal by therapy using the oligonucleotide, and a pharmaceutical composition comprising the oligonucleotide.