| CPC C12N 15/111 (2013.01) [C12N 15/113 (2013.01); C12N 2310/113 (2013.01); C12N 2310/315 (2013.01); C12N 2310/3183 (2013.01); C12N 2310/319 (2013.01); C12N 2310/3231 (2013.01); C12N 2310/3341 (2013.01); C12N 2310/346 (2013.01); C12N 2310/351 (2013.01)] | 25 Claims |

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1. A modified oligonucleotide consisting of 6 to 20 linked nucleotides and having a nucleobase sequence substantially complementary to positions 2-10, counting from 5′-end of antisense strand of a siRNA, wherein the siRNA comprises a sense strand and an antisense strand, wherein the sense and antisense strand hybridize to form a duplex structure comprising from 14 to 30 basepairs, wherein the antisense strand is complementary to at least a part of a target sequence, wherein the modified oligonucleotide is at least 4 nucleotides shorter than the antisense strand, wherein the modified oligonucleotide comprises a 2′-deoxy nucleoside only at position 1, counting from the 3′-end, and wherein the modified oligonucleotide comprises at least 2 locked nucleic acid (LNA) modifications, and two of the LNA modifications in the modified oligonucleotide are: (i) at position 2, counting from 3′-end, and at position 1, counting from 5′-end; or (ii) at position 2, counting from 3′-end, and at position 2, counting from 5′-end).
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