Reduced size self-delivering nucleic acid compounds targeting long non-coding RNA
The present disclosure relates to RNAi constructs with improved cellular uptake characteristics and methods of use of these compounds for silencing expression of long coding RNAs (IncRNAs).
1. An isolated, double stranded nucleic acid molecule comprising a guide strand of 18-23 nucleotides in length that has complementarity to a lncRNA sequence, and a passenger strand of 8-16 nucleotides in length, wherein the molecule comprises a double stranded region and a single stranded region, wherein the single stranded region is the 3′ end of the guide strand, is 2-13 nucleotides in length, and comprises at least two phosphorothioate modifications, wherein at least 50% of the pyrimidines in the nucleic acid molecule are modified,
wherein the isolated double stranded nucleic acid molecule is an lncRNA inhibitor of the lncRNA MALAT1; and
wherein the double stranded nucleic acid molecule comprises at least 12 contiguous nucleotides of a sequence selected from SEQ ID NOs: 287, 288, 293, 295, 299, 617, 618, 623, 625, and 629.
2. The nucleic acid molecule of claim 1 , wherein the first nucleotide relative to the 5′end of the guide strand has a 2′-O-methyl modification, optionally wherein the 2′-O-methyl modification is a 5P-2′-O-methyl U modification, or a 5′ vinyl phosphonate 2′-O-methyl U modification.
3. The nucleic acid molecule of claim 1 , wherein at least 60%, at least 80%, at least 90% or wherein 100% of the pyrimidines in the nucleic acid molecule are modified.
4. The nucleic acid molecule of claim 1 , wherein at least one U or C includes a hydrophobic modification, optionally wherein a plurality of U's and/or C's include a hydrophobic modification, optionally wherein the hydrophobic modification is a methyl or ethyl hydrophobic base modification.
5. The nucleic acid molecule of claim 1 , wherein the guide strand comprises:
(i) 6-8 phosphorothioate modifications;
(ii) 4-14 phosphorothioate modifications; or,
(iii) at least eight phosphorothioate modifications located within the first 10 nucleotides relative to the 3′end of the guide strand.
6. The nucleic acid molecule of claim 1 , wherein the single stranded region of the guide strand is 6 nucleotides long to 8 nucleotides long.
7. The nucleic acid molecule of claim 1 , wherein the double stranded region is 13 nucleotides long and/or wherein the double stranded nucleic acid molecule has one end that is blunt or includes a one nucleotide overhang.
8. The nucleic acid molecule of claim 1 , wherein the passenger strand is linked at the 3′ end to a lipophilic group.
9. The nucleic acid molecule of claim 8 , wherein the lipophilic group is a sterol, optionally wherein the sterol is cholesterol.
10. The nucleic acid molecule of claim 1 , wherein the guide strand is at least 50% chemically modified.
11. A method for modulating lncRNA expression and/or activity in a cell, comprising contacting a cell with the nucleic acid molecule of claim 1 in an amount effective to modulate lncRNA expression and/or activity in the cell.
12. The method of claim 11 , wherein the lncRNA is localized in the nucleus of the cell.
13. The method of claim 11 , wherein the cell is a bacterial cell or a eukaryotic cell.
14. The method of claim 13 , wherein the cell is a mammalian cell.
15. The method of claim 11 , wherein the cell is contacted with the isolated nucleic acid molecule in vivo or ex vivo.
16. A method of delivering a nucleic acid molecule to a cell, the method comprising administering an isolated nucleic acid molecule to a cell, wherein the isolated nucleic acid molecule comprises a guide strand that has complementarity to a lncRNA sequence and a passenger a strand, wherein the passenger strand is between 8-15 nucleotides in length and comprises at least two phosphorothioate modifications, wherein at least 50% of the pyrimidines in the passenger strand are modified, wherein the molecule comprises a hydrophobic conjugate;
wherein the isolated double stranded nucleic acid molecule is an lncRNA inhibitor of the lncRNA MALAT1; and
wherein the double stranded nucleic acid molecule comprises at least 12 contiguous nucleotides of a sequence selected from SEQ ID NOs: 287, 288, 293, 295, 299, 617, 618, 623, 625, and 629.
17. The method of claim 11 , wherein the lncRNA is localized in the cytoplasm of the cell.
18. The method of claim 11 , wherein the lncRNA is localized both in the nucleus and the cytoplasm of the cell.
19. The method of claim 14 , wherein the mammalian cell is a mammalian stem cell.