The present invention relates to oligonucleotides (oligomers) that are complementary to and hybridize to SNHG14 downstream of SNORD109B, leading to induction of paternal expression of Ubiquitin-protein ligase E3A (UBE3A) in an animal or human. The present invention further relates to pharmaceutical compositions and methods for treatment of Angelman syndrome.

Angelman syndrome is neuro-genetic disorder caused by deletion or inactivation of the UBE3A genes on the maternally inherited chromosome 15q11.2. The paternal copy of the UBE3A gene is subject to genomic imprinting and silencing in neurons by an endogenous antisense transcript of UBE3A, termed SNHG14 (also known as UBE3A-ATS) (Meng et al. 2012 Hum Mol Genet. Vol. 21 pp. 3001-12). Other cell types than neurons seem to express the UBE3A gene from both the maternal and paternal allele.

Angelman syndrome is characterized by severe intellectual and developmental disability, sleep disturbance, seizures, jerky movements, EEG abnormalities, frequent laughter or smiling, and profound language impairments.

WO 2012/064806 discloses a method of inducing UBE3A expression in a cell by using a topoisomerase inhibitor. The method can be used to treat Angelman syndrome. There is no disclosure of antisense oligonucleotides.

WO 2014/004572 discloses oligonucleotides with 2'-O-methoxyethyl-RNA (MOE) modifications targeting mouse UBE3A-ATS. The oligonucleotides are only tested in mice related assays. In the region downstream of MBII-52 snoRNA (also known as SNORD115) and upstream of the UBE3A pre-mRNA there is no conservation between mouse and human.Oligonucleotides targeting mouse UBE3A-ATS can therefore not be translated into oligonucleotides that will function in a human. There is no disclosure of oligonucleotides targeting human UBE3A-ATS.

The present invention identifies novel oligonucleotides which induce human paternal UBE3A expression in neuronal without affection expression of the paternal SNORD115, SNORD116 and SNRPN transcripts significantly.

The present invention relates to oligonucleotides targeting a nucleic acid capable of supressing the expression of UBE3A and to treat or prevent diseases related to decreased activity of UBE3A, in particular in neuronal cells.

Accordingly, in a first aspect the invention provides antisense oligonucleotides which comprise a contiguous nucleotide sequence of 10 to 30 nucleotides in length with at least 98% complementarity to the part of human SNHG14 long non-coding RNA corresponding to position 25278410 to 25419462 on human chromosome 15 version GRCh38.p2 for use in the treatment or prevention of Angelman syndrome in a subject. This region is also resembled by SEQ ID NO: 1. The oligonucleotide is an antisense oligonucleotide, preferably with a gapmer design. The oligonucleotide is capable of inducing the expression of UBE3A, in particular paternal UBE3A expression in a neuron, by degradation, reduction or removal of the UBE3A suppressor, in particular by reduction of the SNHG14 long non-coding RNA transcript downstream of SNORD109B. The UBE3A re-expression is achieved, without significantly affecting the expression of SNORD115. The degradation of the target nucleic acid is preferably achieved via nuclease recruitment.

In a further aspect, the invention provides an antisense oligonucleotide capable of inducing human paternal UBE3A expression for use in the treatment or prevention of Angelman syndrome in a subject, wherein said antisense oligonucleotide comprises a contiguous nucleotide sequence that is 100% complementary to a region of the target nucleic acid of position 1 to 55318 of SEQ ID NO: 1, wherein the oligonucleotide is either 15 to 20 nucleotides in length or 17 to 22 nucleotides in length, wherein the oligonucleotide comprises one or more modified nucleosides, wherein the one or more modified nucleosides is a 2' sugar modified nucleoside, wherein the one or more 2' sugar modified nucleoside is independently selected from the group consisting of 2'-O-alkyl-RNA, 2'-O-methyl-RNA, 2'-alkoxy-RNA, 2'-O-methoxyethyl-RNA, 2'-amino-DNA, 2'-fluoro-DNA, arabino nucleic acid (ANA), 2'-fluoro-ANA and LNA nucleosides, wherein the oligonucleotide comprises at least one modified internucleoside linkage, wherein said modified internucleoside linkage is a phosphorothioate linkage, wherein the oligonucleotide is a gapmer of the formula F-G-F' wherein each of regions F and F' independently consists of 2, 3, 4 or 5 modified nucleoside units and region G consists of 9, 10, 11, 12, 13, 14 or 15 nucleoside units. In a further aspect, the invention provides a conjugate for use in the treatment or prevention of Angelman syndrome in a subject, the conjugate comprising an antisense oligonucleotide of the invention and at least one conjugate moiety covalently attached to the oligonucleotide.

In a further aspect, the invention provides pharmaceutical compositions comprising the oligonucleotides or conjugates of the invention and pharmaceutically acceptable diluents, carriers, salts and/or adjuvants.

In a further aspect, the invention provides methods for in vitro induction of UBE3A expression in a target cell where expression of paternal UBE3A is suppressed, by administering an oligonucleotide, conjugate or composition of the invention in an effective amount to said cell.

• Figure 1: The upper strand illustrates the region of the SNHG14 transcript downstream of SNORD109B (UBE3A-ATS) where the black boxes indicate the location of the tested mouse oligonucleotides. The lower strand illustrates the UBE3A coding region, where the black boxes indicate exons. Exon 1 is located around 160kb. The oligonucleotides are placed in the antisense region of Exon 9 (positioned at ~97kb), Exon 10 (positioned at ~92kb), Exon 13 (positioned at ~77kb) and the 5' end of Exon 16 (positioned at ~60kb).
• Figure 2: Representation of the ability of the oligonucleotides, tested in Example 2, to induce re-expression of UBE3A in human neuronal cell cultures. Oligonucleotides complementary to the region of human SNHG14 long non-coding RNA between SNORD109B and the region upstream of the UBE3A coding region (position 1 to 55318 of SEQ ID NO: 1) are indicated with • nonoverlap.
• Oligonucleotides complementary to the region of human SNHG14 long non-coding RNA which is antisense to the UBE3A pre-mRNA (position 55319 to 141053 of SEQ ID NO: 1) are indicated with ▲overlap. Oligonucleotides from Table 3 with conservation to human and rhesus monkey are indicated at the bottom of each plot as . Conservation between human:rhesus:mouse is indicated by . The oligonucleotide concentrations were 0.2, 1 and 5 microM as indicated in the right hand side each plot.

The term "oligonucleotide" as used herein is defined as it is generally understood by the skilled person as a molecule comprising two or more covalently linked nucleosides. Such covalently bound nucleosides may also be referred to as nucleic acid molecules or oligomers. Oligonucleotides are commonly made in the laboratory by solid-phase chemical synthesis followed by purification. When referring to a sequence of the oligonucleotide, reference is made to the sequence or order of nucleobase moieties, or modifications thereof, of the covalently linked nucleotides or nucleosides. The oligonucleotide of the invention is man-made, and is chemically synthesized, and is typically purified or isolated. The oligonucleotide of the invention may comprise one or more modified nucleosides or nucleotides.

The term "Antisense oligonucleotide" as used herein is defined as oligonucleotides capable of modulating expression of a target gene by hybridizing to a target nucleic acid, in particular to a contiguous sequence on a target nucleic acid. The antisense oligonucleotides are not essentially double stranded and are therefore not siRNAs. Preferably, the antisense oligonucleotides of the present invention are single stranded.

The term "contiguous nucleotide sequence" refers to the region of the oligonucleotide which is complementary to the target nucleic acid. The term is used interchangeably herein with the term "contiguous nucleobase sequence" and the term "oligonucleotide motif sequence". In some embodiments all the nucleotides of the oligonucleotide are present in the contiguous nucleotide sequence. In some embodiments the oligonucleotide comprises the contiguous nucleotide sequence and may, optionally comprise further nucleotide(s), for example a nucleotide linker region which may be used to attach a functional group to the contiguous nucleotide sequence. The nucleotide linker region may or may not be complementary to the target nucleic acid.

Nucleotides are the building blocks of oligonucleotides and polynucleotides, and for the purposes of the present invention include both naturally occurring and non-naturally occurring nucleotides. In nature, nucleotides, such as DNA and RNA nucleotides comprise a ribose sugar moiety, a nucleobase moiety and one or more phosphate groups (which is absent in nucleosides). Nucleosides and nucleotides may also interchangeably be referred to as "units" or "monomers".

The term "modified nucleoside" or "nucleoside modification" as used herein refers to nucleosides modified as compared to the equivalent DNA or RNA nucleoside by the introduction of one or more modifications of the sugar moiety or the (nucleo)base moiety. In a preferred embodiment the modified nucleoside comprises a modified sugar moiety. The term modified nucleoside may also be used herein interchangeably with the term "nucleoside analogue" or modified "units" or modified "monomers".

The term "modified internucleoside linkage" is defined as generally understood by the skilled person as linkages other than phosphodiester (PO) linkages, that covalently couples two nucleosides together. Nucleotides with modified internucleoside linkage are also termed "modified nucleotides". In some embodiments, the modified internucleoside linkage increases the nuclease resistance of the oligonucleotide compared to a phosphodiester linkage. For naturally occurring oligonucleotides, the internucleoside linkage includes phosphate groups creating a phosphodiester bond between adjacent nucleosides. Modified internucleoside linkages are particularly useful in stabilizing oligonucleotides for in vivo use, and may serve to protect against nuclease cleavage at regions of DNA or RNA nucleosides in the oligonucleotide of the invention, for example within the gap region of a gapmer oligonucleotide, as well as in regions of modified nucleosides.

In an embodiment, the oligonucleotide comprises one or more internucleoside linkages modified from the natural phosphodiester to a linkage that is for example more resistant to nuclease attack. Nuclease resistance may be determined by incubating the oligonucleotide in blood serum or by using a nuclease resistance assay (e.g. snake venom phosphodiesterase (SVPD)), both are well known in the art. Internucleoside linkages which are capable of enhancing the nuclease resistance of an oligonucleotide are referred to as nuclease resistant internucleoside linkages. In preferred embodiments at least 50% of the internucleoside linkages in the oligonucleotide, or contiguous nucleotide sequence thereof, are modified, such as at least 60%, such as at least 70%, such as at least 80 or such as at least 90% of the internucleoside linkages in the oligonucleotide, or contiguous nucleotide sequence thereof, are modified. In some embodiments all of the internucleoside linkages of the oligonucleotide, or contiguous nucleotide sequence thereof, are modified. It will be recognized that, in some embodiments the nucleosides which link the oligonucleotide of the invention to a non-nucleotide functional group, such as a conjugate, may be phosphodiester. In some embodiments all of the internucleoside linkages of the oligonucleotide, or contiguous nucleotide sequence thereof, are nuclease resistant internucleoside linkages.

Modified internucleoside linkages may be selected from the group comprising phosphorothioate, diphosphorothioate and boranophosphate. In preferred embodiments, the modified internucleoside linkages are compatible with the RNaseH recruitment of the oligonucleotide of the invention, for example phosphorothioate, diphosphorothioate or boranophosphate.

In some embodiments the internucleoside linkage comprises sulphur (S), such as a phosphorothioate internucleoside linkage.

A phosphorothioate internucleoside linkage is particularly useful due to nuclease resistance, beneficial pharmakokinetics and ease of manufacture. In preferred embodiments at least 50% of the internucleoside linkages in the oligonucleotide, or contiguous nucleotide sequence thereof, are phosphorothioate, such as at least 60%, such as at least 70%, such as at least 80 or such as at least 90% of the internucleoside linkages in the oligonucleotide, or contiguous nucleotide sequence thereof, are phosphorothioate. In some embodiments all of the internucleoside linkages of the oligonucleotide, or contiguous nucleotide sequence thereof, are phosphorothioate.

In some embodiments, the oligonucleotide comprises one or more neutral internucleoside linkage, particularly a internucleoside linkage selected from phosphotriester, methylphosphonate, MMI, amide-3, formacetal or thioformacetal.

Further internucleoside linkages are disclosed in WO2009/124238. In an embodiment the internucleoside linkage is selected from linkers disclosed in WO2007/031091. Particularly, the internucleoside linkage may be selected from -O-P(O)₂-O-, -O-P(O,S)-O-, -O-P(S)₂-O-, -S-P(O)₂-O-, -S-P(O,S)-O-, -S-P(S)₂-O-, -O-P(O)₂-S-, -O-P(O,S)-S-, -S-P(O)₂-S-, -O-PO(R^H)-O-, 0-PO(OCH₃)-O-, -O-PO(NR^H)-O-, -O-PO(OCH₂CH₂S-R)-O-, -O-PO(BH₃)-O-, -O-PO(NHR^H)-O-, -OP(O)₂-NR^H-, -NR^H-P(O)₂-O-, -NR^H-CO-O-, -NR^H-CO-NR^H-, and/or the internucleoside linker may be selected form the group consisting of: -O-CO-O-, -O-CO-NR^H-, -NR^H-CO-CH₂-, -O-CH₂-CO-NR^H-, -O-CH₂-CH₂-NR^H-, -CO-NR^H-CH₂-, -CH₂-NR^HCO-, -O-CH₂-CH₂-S-, -S-CH₂-CH₂-O-, -S-CH₂-CH₂-S-, -CH₂-SO₂-CH₂-, -CH₂-CO-NR^H-, -O-CH₂-CH₂-NR^H-CO -, -CH₂-NCH₃-O-CH₂-, where R^H is selected from hydrogen and C1 -4-alkyl.

Nuclease resistant linkages, such as phosphothioate linkages, are particularly useful in oligonucleotide regions capable of recruiting nuclease when forming a duplex with the target nucleic acid, such as region G for gapmers, or the non-modified nucleoside region of headmers and tailmers. Phosphorothioate linkages may, however, also be useful in non-nuclease recruiting regions and/or affinity enhancing regions such as regions F and F' for gapmers, or the modified nucleoside region of headmers and tailmers.

Each of the design regions may however comprise internucleoside linkages other than phosphorothioate, such as phosphodiester linkages, in particularly in regions where modified nucleosides, such as LNA, protect the linkage against nuclease degradation. Inclusion of phosphodiester linkages, such as one or two linkages, particularly between or adjacent to modified nucleoside units (typically in the non-nuclease recruiting regions) can modify the bioavailability and/or bio-distribution of an oligonucleotide - see WO2008/113832.

In an embodiment all the internucleoside linkages in the oligonucleotide are phosphorothioate and/or boranophosphate linkages. Preferably, all the internucleoside linkages in the oligonucleotide are phosphorothioate linkages.

The term nucleobase includes the purine (e.g. adenine and guanine) and pyrimidine (e.g. uracil, thymine and cytosine) moiety present in nucleosides and nucleotides which form hydrogen bonds in nucleic acid hybridization. In the context of the present invention the term nucleobase also encompasses modified nucleobases which may differ from naturally occurring nucleobases, but are functional during nucleic acid hybridization. In this context "nucleobase" refers to both naturally occurring nucleobases such as adenine, guanine, cytosine, thymidine, uracil, xanthine and hypoxanthine, as well as non-naturally occurring variants. Such variants are for example described in Hirao et al (2012) Accounts of Chemical Research vol 45 page 2055 and Bergstrom (2009) Current Protocols in Nucleic Acid Chemistry Suppl. 37 1.4.1.

In a some embodiments the nucleobase moiety is modified by changing the purine or pyrimidine into a modified purine or pyrimidine, such as substituted purine or substituted pyrimidine, such as a nucleobased selected from isocytosine, pseudoisocytosine, 5-methyl cytosine, 5-thiozolo-cytosine, 5-propynyl-cytosine, 5-propynyl-uracil, 5-bromouracil 5-thiazolo-uracil, 2-thio-uracil, 2'thio-thymine, inosine, diaminopurine, 6-aminopurine, 2-aminopurine, 2,6-diaminopurine and 2-chloro-6-aminopurine.

The nucleobase moieties may be indicated by the letter code for each corresponding nucleobase, e.g. A, T, G, C or U, wherein each letter may optionally include modified nucleobases of equivalent function. For example, in the exemplified oligonucleotides, the nucleobase moieties are selected from A, T, G, C, and 5-methyl cytosine. Optionally, for LNA gapmers, 5-methyl cytosine LNA nucleosides may be used.

The term modified oligonucleotide describes an oligonucleotide comprising one or more sugar-modified nucleosides and/or modified internucleoside linkages. The term chimeric" oligonucleotide is a term that has been used in the literature to describe oligonucleotides with modified nucleosides.

The term complementarity describes the capacity for Watson-Crick base-pairing of nucleosides/nucleotides. Watson-Crick base pairs are guanine (G)-cytosine (C) and adenine (A) - thymine (T)/uracil (U). It will be understood that oligonucleotides may comprise nucleosides with modified nucleobases, for example 5-methyl cytosine is often used in place of cytosine, and as such the term complementarity encompasses Watson Crick base-paring between non-modified and modified nucleobases (see for example Hirao et al (2012) Accounts of Chemical Research vol 45 page 2055 and Bergstrom (2009) Current Protocols in Nucleic Acid Chemistry Suppl. 37 1.4.1).

The term "% complementary" as used herein, refers to the number of nucleotides in percent of a contiguous nucleotide sequence in a nucleic acid molecule (e.g. oligonucleotide) which, at a given position, are complementary to (i.e. form Watson Crick base pairs with) a contiguous nucleotide sequence, at a given position of a separate nucleic acid molecule (e.g. the target nucleic acid). The percentage is calculated by counting the number of aligned bases that form pairs between the two sequences, dividing by the total number of nucleotides in the oligonucleotide and multiplying by 100. In such a comparison a nucleobase/nucleotide which does not align (form a base pair) is termed a mismatch.

The term "fully complementary", refers to 100% complementarity.

The term "hybridizing" or "hybridizes" as used herein is to be understood as two nucleic acid strands (e.g. an oligonucleotide and a target nucleic acid) forming hydrogen bonds between base pairs on opposite strands thereby forming a duplex. The affinity of the binding between two nucleic acid strands is the strength of the hybridization. It is often described in terms of the melting temperature (T_m) defined as the temperature at which half of the oligonucleotides are duplexed with the target nucleic acid. At physiological conditions T_m is not strictly proportional to the affinity (Mergny and Lacroix, 2003,Oligonucleotides 13:515-537). The standard state Gibbs free energy ΔG° is a more accurate representation of binding affinity and is related to the dissociation constant (K_d) of the reaction by ΔG°=-RTIn(K_d), where R is the gas constant and T is the absolute temperature. Therefore, a very low ΔG° of the reaction between an oligonucleotide and the target nucleic acid reflects a strong hybridization between the oligonucleotide and target nucleic acid. ΔG° is the energy associated with a reaction where aqueous concentrations are 1M, the pH is 7, and the temperature is 37°C. The hybridization of oligonucleotides to a target nucleic acid is a spontaneous reaction and for spontaneous reactions ΔG° is less than zero. ΔG° can be measured experimentally, for example, by use of the isothermal titration calorimetry (ITC) method as described in Hansen et al., 1965, Chem. Comm. 36-38 and Holdgate et al., 2005, Drug Discov Today. The skilled person will know that commercial equipment is available for ΔG° measurements. ΔG° can also be estimated numerically by using the nearest neighbor model as described by SantaLucia, 1998, Proc Natl Acad Sci USA. 95: 1460-1465 using appropriately derived thermodynamic parameters described by Sugimoto et al., 1995, Biochemistry 34:11211-11216 and McTigue et al., 2004, Biochemistry 43:5388-5405. In order to have the possibility of modulating its intended nucleic acid target by hybridization, oligonucleotides of the present invention hybridize to a target nucleic acid with estimated ΔG° values below -10 kcal for oligonucleotides that are 10-30 nucleotides in length. In some embodiments the degree or strength of hybridization is measured by the standard state Gibbs free energy ΔG°. The oligonucleotides may hybridize to a target nucleic acid with estimated ΔG° values below the range of -10 kcal, such as below -15 kcal, such as below -20 kcal and such as below -25 kcal for oligonucleotides that are 8-30 nucleotides in length. In some embodiments the oligonucleotides hybridize to a target nucleic acid with an estimated ΔG° value of -10 to -60 kcal, such as -12 to -40, such as from -15 to -30 kcal or-16 to -27 kcal such as -18 to -25 kcal.

The target refers to the protein which it is desired to modulate.

A target nucleic acid is the intended target which the oligonucleotide of the invention hybridizes to, and may for example be a gene, a RNA, a non-coding RNA, a long non-coding RNA, a mRNA, and pre-mRNA, a mature mRNA or a cDNA sequence. In some embodiments the target nucleic acid is a non-coding RNA or a long non-coding RNA, or a subsequence thereof. For in vivo or in vitro application, the oligonucleotide of the invention is capable of decreasing the level of the SNHG14 transcript downstream of SNORD109B of and thereby relieving the suppression of the paternal UBE3A transcript in the intended target cell. The contiguous sequence of nucleobases of the oligonucleotide of the invention is complementary to the target nucleic acid, as measured across the length of the oligonucleotide, optionally with the exception of one or two mismatches, and optionally excluding nucleotide based linker regions which may link the oligonucleotide to an optional functional group such as a conjugate.

The oligonucleotide comprises a contiguous nucleotide sequence which is complementary to or hybridizes to a sub-sequence of the target nucleic acid molecule. The term "target sequence" as used herein refers to a sequence of nucleotides present in the target nucleic acid which comprises the nucleobase sequence which is complementary to the oligonucleotide of the invention. In some embodiments, the target sequence consists of a region on the target nucleic acid which is complementary to the contiguous nucleotide sequence of the oligonucleotide of the invention. In some embodiments the target sequence is longer than the complementary sequence of a single oligonucleotide, and may, for example represent a preferred region of the target nucleic acid which may be targeted by several oligonucleotides of the invention.

The oligonucleotide of the invention comprises a contiguous nucleotide sequence which is complementary to the target nucleic acid, such as a target sequence.

The oligonucleotide comprises a contiguous nucleotide sequence of at least 8 nucleotides which is complementary to or hybridizes to a target sequence present in the target nucleic acid molecule. The contiguous nucleotide sequence (and therefore the target sequence) comprises of at least 8 contiguous nucleotides, such as 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30 contiguous nucleotides, such as from 12-25, such as from 14-18 contiguous nucleotides.

The term a target cell as used herein refers to a cell which is expressing the target nucleic acid. In some embodiments the target cell may be in vivo or in vitro. In some embodiments the target cell is a mammalian cell such as a rodent cell, such as a mouse cell or a rat cell, or a primate cell such as a monkey cell or a human cell. In preferred embodiments the target cell is a neuronal cell.

The term "naturally occurring variant" refers to variants of SNHG14 transcript downstream of SNORD109B gene or transcripts which originate from the same genetic loci as the target nucleic acid, but may differ for example, by virtue of degeneracy of the genetic code causing a multiplicity of codons in the long non-coding RNA. The oligonucleotide of the invention may therefore be designed to target the target nucleic acid and naturally occurring variants thereof.

The term "modulation of expression" as used herein is to be understood as an overall term for an oligonucleotide's ability to alter the amount of UBE3A protein when compared to the amount of UBE3A before administration of the oligonucleotide. Alternatively modulation of expression may be determined by reference to a control experiment where the oligonucleotide of the invention is not administered. The modulation effected by the oligonucleotide is related to it's ability to reduce, remove, prevent, lessen, lower or terminate the suppression of the paternal UBE3A transcript, e.g. by degradation or removal of the non-coding SNHG14 transcript downstream of SNORD109B or by blockage or prevention of polymerase activity associated with the SNHG14 transcript downstream of SNORD109B. The modulation can also be viewed as the oligonucleotide's ability to restore, increase or enhance expression of paternal UBE3A, e.g. by removal or blockage of inhibitory mechanisms affected by the non-coding SNHG14 transcript downstream of SNORD109B.

A high affinity modified nucleoside is a modified nucleotide which, when incorporated into the oligonucleotide enhances the affinity of the oligonucleotide for its complementary target, for example as measured by the melting temperature (T^m). A high affinity modified nucleoside of the present invention preferably result in an increase in melting temperature between +0.5 to +12°C, more preferably between +1.5 to +10°C and most preferably between+3 to +8°C per modified nucleoside. Numerous high affinity modified nucleosides are known in the art and include for example, many 2' substituted nucleosides as well as locked nucleic acids (LNA) (see e.g. Freier & Altmann; Nucl. Acid Res., 1997, 25, 4429-4443 and Uhlmann; Curr. Opinion in Drug Development, 2000, 3(2), 293-213).

The oligomer of the invention may comprise one or more nucleosides which have a modified sugar moiety, i.e. a modification of the sugar moiety when compared to the ribose sugar moiety found in DNA and RNA.

Numerous nucleosides with modification of the ribose sugar moiety have been made, primarily with the aim of improving certain properties of oligonucleotides, such as affinity and/or nuclease resistance.

Such modifications include those where the ribose ring structure is modified, e.g. by replacement with a hexose ring (HNA), or a bicyclic ring, which typically have a biradicle bridge between the C2 and C4 carbons on the ribose ring (LNA), or an unlinked ribose ring which typically lacks a bond between the C2 and C3 carbons (e.g. UNA). Other sugar modified nucleosides include, for example, bicyclohexose nucleic acids (WO2011/017521) or tricyclic nucleic acids (WO2013/154798). Modified nucleosides also include nucleosides where the sugar moiety is replaced with a non-sugar moiety, for example in the case of peptide nucleic acids (PNA), or morpholino nucleic acids.

Sugar modifications also include modifications made via altering the substituent groups on the ribose ring to groups other than hydrogen, or the 2'-OH group naturally found in DNA and RNA nucleosides. Substituents may, for example be introduced at the 2', 3', 4' or 5' positions. Nucleosides with modified sugar moieties also include 2' modified nucleosides, such as 2' substituted nucleosides. Indeed, much focus has been spent on developing 2' substituted nucleosides, and numerous 2' substituted nucleosides have been found to have beneficial properties when incorporated into oligonucleotides, such as enhanced nucleoside resistance and enhanced affinity.

A 2' sugar modified nucleoside is a nucleoside which has a substituent other than H or -OH at the 2' position (2' substituted nucleoside) or comprises a 2' linked biradicle, and includes 2' substituted nucleosides and LNA (2' - 4' biradicle bridged) nucleosides. For example, the 2' modified sugar may provide enhanced binding affinity and/or increased nuclease resistance to the oligonucleotide. Examples of 2' substituted modified nucleosides are 2'-O-alkyl-RNA, 2'-O-methyl-RNA, 2'-alkoxy-RNA, 2'-O-methoxyethyl-RNA (MOE), 2'-amino-DNA, 2'-Fluoro-RNA, and 2'-fluoro-ANA (F-ANA). For further examples, please see e.g. Freier & Altmann; Nucl. Acid Res., 1997, 25, 4429-4443 and Uhlmann; Curr. Opinion in Drug Development, 2000, 3(2), 293-213; and Deleavey and Damha, Chemistry and Biology 2012, 19, 937. Below are illustrations of some 2' substituted modified nucleosides.

LNA nucleosides are modified nucleosides which comprise a linker group (referred to as a biradicle or a bridge) between C2' and C4' of the ribose sugar ring of a nucleotide. These nucleosides are also termed bridged nucleic acid or bicyclic nucleic acid (BNA) in the literature.

In some embodiments, the modified nucleoside or the LNA nucleosides of the oligomer of the invention has a general structure of the formula I or II:

• wherein W is selected from -O-, -S-, -N(R^a)-, -C(R^aR^b)-, such as, in some embodiments -O-;
• B designates a nucleobase or modified nucleobase moiety;
• Z designates an internucleoside linkage to an adjacent nucleoside, or a 5'-terminal group;
• Z* designates an internucleoside linkage to an adjacent nucleoside, or a 3'-terminal group;
• X designates a group selected from the list consisting of -C(R^aR^b)-, -C(R^a)=C(R^b)-, - C(R^a)=N-, -O-, -Si(R^a)₂-, -S-, -SO₂-, -N(R^a)-, and >C=Z

In some embodiments, X is selected from the group consisting of: -O-, -S-, NH-, NR^aR^b, -CH₂-, CR^aR^b, -C(=CH₂)-, and -C(=CR^aR^b)-

In some embodiments, X is -O-

Y designates a group selected from the group consisting of -C(R^aR^b)-, -C(R^a)=C(R^b)-, - C(R^a)=N-, -O-, -Si(R^a)₂-, -S-, -SO₂-, -N(R^a)-, and >C=Z

In some embodiments, Y is selected from the group consisting of: -CH₂-, -C(R^aR^b)-, - CH₂CH₂-, -C(R^aR^b)-C(R^aR^b)-, -CH₂CH₂CH₂-, -C(R^aR^b)C(R^aR^b)C(R^aR^b)-, -C(R^a)=C(R^b)-, and -C(R^a)=N-

In some embodiments, Y is selected from the group consisting of: -CH₂-, -CHR^a-, - CHCH₃-, CR^aR^b-
or -X-Y- together designate a bivalent linker group (also referred to as a radicle) together designate a bivalent linker group consisting of 1, 2, 3 or 4 groups/atoms selected from the group consisting of -C(R^aR^b)-, -C(R^a)=C(R^b)-, -C(R^a)=N-, -O-, -Si(R^a)₂-, -S-, -SO₂-, -N(R^a)-, and >C=Z,

In some embodiments, -X-Y- designates a biradicle selected from the groups consisting of: -X-CH₂-, -X-CR^aR^b-, -X-CHR^a_', -X-C(HCH₃)^-, -O-Y-, -O-CH₂-, -S-CH₂-, -NH-CH₂-, -O-CHCH₃-, -CH₂-O-CH₂, -O-CH(CH₃CH₃)-, -O-CH₂-CH₂-, OCH₂-CH₂-CH₂-,-O-CH₂OCH₂-,-O-NCH₂-, -C(=CH₂)-CH₂-, -NR^a-CH₂-, N-O-CH₂, -S-CR^aR^b- and -S-CHR^a-.

In some embodiments -X-Y- designates -O-CH₂- or -O-CH(CH₃)-.

• wherein Z is selected from -O-, -S-, and -N(R^a)-,
• and R^a and, when present R^b, each is independently selected from hydrogen, optionally substituted C_1-6-alkyl, optionally substituted C_2-6-alkenyl, optionally substituted C_2-6-alkynyl, hydroxy, optionally substituted C_1-6-alkoxy, C_2-6-alkoxyalkyl, C_2-6-alkenyloxy, carboxy, C_1-6-alkoxycarbonyl, C_1-6-alkylcarbonyl, formyl, aryl, aryloxy-carbonyl, aryloxy, arylcarbonyl, heteroaryl, heteroaryloxy-carbonyl, heteroaryloxy, heteroarylcarbonyl, amino, mono- and di(C_1-6-alkyl)amino, carbamoyl, mono- and di(C_1-6-alkyl)-amino-carbonyl, amino-C_1-6-alkylaminocarbonyl, mono- and di(C_1-6-alkyl)amino-C_1-6-alkyl-aminocarbonyl, C_1-6-alkylcarbonylamino, carbamido, C_1-6-alkanoyloxy, sulphono, C_1-6-alkylsulphonyloxy, nitro, azido, sulphanyl, C_1-6-alkylthio, halogen, where aryl and heteroaryl may be optionally substituted and where two geminal substituents R^a and R^b together may designate optionally substituted methylene (=CH₂), wherein for all chiral centers, asymmetric groups may be found in either R or S orientation.
• wherein R¹, R², R³, R⁵ and R^5* are independently selected from the group consisting of: hydrogen, optionally substituted C_1-6-alkyl, optionally substituted C_2-6-alkenyl, optionally substituted C_2-6-alkynyl, hydroxy, C_1-6-alkoxy, C_2-6-alkoxyalkyl, C_2-6-alkenyloxy, carboxy, C_1-6-alkoxycarbonyl, C_1-6-alkylcarbonyl, formyl, aryl, aryloxy-carbonyl, aryloxy, arylcarbonyl, heteroaryl, heteroaryloxy-carbonyl, heteroaryloxy, heteroarylcarbonyl, amino, mono- and di(C_1-6-alkyl)amino, carbamoyl, mono- and di(C_1-6-alkyl)-amino-carbonyl, amino-C_1-6-alkylaminocarbonyl, mono- and di(C_1-6-alkyl)amino-C_1-6-alkyl-aminocarbonyl, C_1-6-alkylcarbonylamino, carbamido, C_1-6-alkanoyloxy, sulphono, C_1-6-alkylsulphonyloxy, nitro, azido, sulphanyl, C_1-6-alkylthio, halogen, where aryl and heteroaryl may be optionally substituted, and where two geminal substituents together may designate oxo, thioxo, imino, or optionally substituted methylene.

In some embodiments R¹, R², R³, R⁵ and R^5* are independently selected from C_1-6 alkyl, such as methyl, and hydrogen.

In some embodiments R¹, R², R³, R⁵ and R^5* are all hydrogen.

In some embodiments R¹, R², R³, are all hydrogen, and either R⁵ and R^5* is also hydrogen and the other of R⁵ and R^5*is other than hydrogen, such as C_1-6 alkyl such as methyl.

In some embodiments, R^a is either hydrogen or methyl. In some embodiments, when present, R^b is either hydrogen or methyl.

In some embodiments, one or both of R^a and R^b is hydrogen

In some embodiments, one of R^a and R^b is hydrogen and the other is other than hydrogen

In some embodiments, one of R^a and R^b is methyl and the other is hydrogen

In some embodiments, both of R^a and R^b are methyl.

In some embodiments, the biradicle -X-Y- is -O-CH₂-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such LNA nucleosides are disclosed in WO99/014226, WO00/66604, WO98/039352 and WO2004/046160, and include what are commonly known as beta-D-oxy LNA and alpha-L-oxy LNA nucleosides.

In some embodiments, the biradicle -X-Y- is -S-CH₂-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such thio LNA nucleosides are disclosed in WO99/014226 and WO2004/046160.

In some embodiments, the biradicle -X-Y- is -NH-CH₂-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such amino LNA nucleosides are disclosed in WO99/014226 and WO2004/046160.

In some embodiments, the biradicle -X-Y- is -O-CH₂-CH₂- or -O-CH₂-CH₂- CH₂-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such LNA nucleosides are disclosed in WO00/047599 and Morita et al, Bioorganic & Med.Chem. Lett. 12 73-76, and include what are commonly known as 2'-O-4'C-ethylene bridged nucleic acids (ENA).

In some embodiments, the biradicle -X-Y- is -O-CH₂-, W is O, and all of R¹, R², R³, and one of R⁵ and R^5* are hydrogen, and the other of R⁵ and R^5* is other than hydrogen such as C_1-6 alkyl, such as methyl. Such 5' substituted LNA nucleosides are disclosed in WO2007/134181.

In some embodiments, the biradicle -X-Y- is -O-CR^aR^b-, wherein one or both of R^a and R^b are other than hydrogen, such as methyl, W is O, and all of R¹, R², R³, and one of R⁵ and R^5* are hydrogen, and the other of R⁵ and R^5* is other than hydrogen such as C_1-6 alkyl, such as methyl. Such bis modified LNA nucleosides are disclosed in WO2010/077578.

In some embodiments, the biradicle -X-Y- designate the bivalent linker group -O-CH(CH₂OCH₃)- (2' O-methoxyethyl bicyclic nucleic acid - Seth at al., 2010, J. Org. Chem. Vol 75(5) pp. 1569-81). In some embodiments, the biradicle -X-Y- designate the bivalent linker group -O-CH(CH₂CH₃)- (2'O-ethyl bicyclic nucleic acid - Seth at al., 2010, J. Org. Chem. Vol 75(5) pp. 1569-81). In some embodiments, the biradicle -X-Y- is -O-CHR^a-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such 6' substituted LNA nucleosides are disclosed in WO10036698 and WO07090071.

In some embodiments, the biradicle -X-Y- is -O-CH(CH₂OCH₃)-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such LNA nucleosides are also known as cyclic MOEs in the art (cMOE) and are disclosed in WO07090071.

In some embodiments, the biradicle -X-Y- designate the bivalent linker group -O-CH(CH₃)-. - in either the R- or S- configuration. In some embodiments, the biradicle -X-Y- together designate the bivalent linker group -O-CH₂-O-CH₂- (Seth at al., 2010, J. Org. Chem). In some embodiments, the biradicle -X-Y- is -O-CH(CH₃)-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such 6' methyl LNA nucleosides are also known as cET nucleosides in the art, and may be either (S)cET or (R)cET stereoisomers, as disclosed in WO07090071 (beta-D) and WO2010/036698 (alpha-L).

In some embodiments, the biradicle -X-Y- is -O-CR^aR^b-, wherein in neither R^a or R^b is hydrogen, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. In some embodiments, R^a and R^b are both methyl. Such 6' di-substituted LNA nucleosides are disclosed in WO 2009006478.

In some embodiments, the biradicle -X-Y- is -S-CHR^a-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such 6' substituted thio LNA nucleosides are disclosed in WO11156202. In some 6' substituted thio LNA embodiments R^a is methyl.

In some embodiments, the biradicle -X-Y- is -C(=CH2)-C(R^aR^b)-, such as -C(=CH₂)-CH₂- , or - C(=CH₂)-CH(CH₃)-W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. Such vinyl carbo LNA nucleosides are disclosed in WO08154401 and WO09067647.

In some embodiments the biradicle -X-Y- is -N(-OR^a)-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. In some embodiments R^a is C_1-6alkyl such as methyl. Such LNA nucleosides are also known as N substituted LNAs and are disclosed in WO2008/150729. In some embodiments, the biradicle -X-Y- together designate the bivalent linker group -O-NR^a-CH₃-(Seth at al., 2010, J. Org. Chem). In some embodiments the biradicle -X-Y- is -N(R^a)-, W is O, and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. In some embodiments R^a is C_1-6 alkyl such as methyl.

In some embodiments, one or both of R⁵ and R^5* is hydrogen and, when substituted the other of R⁵ and R^5* is C_1-6 alkyl such as methyl. In such an embodiment, R¹, R², R³, may all be hydrogen, and the biradicle -X-Y- may be selected from -O-CH2- or -O-C(HCR^a)-, such as -O-C(HCH3)-.

In some embodiments, the biradicle is -CR^aR^b-O-CR^aR^b-, such as CH₂-O-CH₂-, W is O and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. In some embodiments R^a is C_1-6 alkyl such as methyl. Such LNA nucleosides are also known as conformationally restricted nucleotides (CRNs) and are disclosed in WO2013036868.

In some embodiments, the biradicle is -O-CR^aR^b-O-CR^aR^b-, such as O-CH₂-O-CH₂-, W is O and all of R¹, R², R³, R⁵ and R^5* are all hydrogen. In some embodiments R^a is C_1-6 alkyl such as methyl. Such LNA nucleosides are also known as COC nucleotides and are disclosed in Mitsuoka et al., Nucleic Acids Research 2009 37(4), 1225-1238.

It will be recognized than, unless specified, the LNA nucleosides may be in the beta-D or alpha-L stereoisoform.

Certain examples of LNA nucleosides are presented in Scheme 1.

As illustrated in the examples, in preferred embodiments of the invention the LNA nucleosides in the oligonucleotides are beta-D-oxy-LNA nucleosides.

Nuclease mediated degradation refers to an oligonucleotide capable of mediating degradation of a complementary nucleotide sequence when forming a duplex with such a sequence.

In some embodiments, the oligonucleotide may function via nuclease mediated degradation of the target nucleic acid, where the oligonucleotides of the invention are capable of recruiting a nuclease, particularly and endonuclease, preferably endoribonuclease (RNase), such as RNase H. Examples of oligonucleotide designs which operate via nuclease mediated mechanisms are oligonucleotides which typically comprise a region of at least 5 or 6 DNA nucleosides and are flanked on one side or both sides by affinity enhancing nucleosides, for example gapmers, headmers and tailmers.

The RNase H activity of an antisense oligonucleotide refers to its ability to recruit RNase H when in a duplex with a complementary RNA molecule. WO01/23613 provides in vitro methods for determining RNaseH activity, which may be used to determine the ability to recruit RNaseH. Typically an oligonucleotide is deemed capable of recruiting RNase H if it, when provided with a complementary target nucleic acid sequence, has an initial rate, as measured in pmol/l/min, of at least 10% or more than 20% of the of the initial rate determined when using a oligonucleotide having the same base sequence as the modified oligonucleotide being tested, but containing only DNA monomers, with phosphorothioate linkages between all monomers in the oligonucleotide, and using the methodology provided by Example 91 - 95 of WO01/23613.

The term gapmer as used herein refers to an antisense oligonucleotide which comprises a region of RNase H recruiting oligonucleotides (gap) which is flanked 5' and 3' by one or more affinity enhancing modified nucleosides (flanks). Various gapmer designs are described herein. Headmers and tailmers are oligonucleotides capable of recruiting RNase H where one of the flanks is missing, i.e. only one of the ends of the oligonucleotide comprises affinity enhancing modified nucleosides. For headmers the 3' flank is missing (i.e. the 5' flanc comprise affinity enhancing modified nucleosides) and for tailmers the 5' flank is missing (i.e. the 3' flank comprises affinity enhancing modified nucleosides).

The term LNA gapmer is a gapmer oligonucleotide wherein at least one of the affinity enhancing modified nucleosides is an LNA nucleoside.

The term mixed wing gapmer refers to a LNA gapmer wherein the flank regions comprise at least one LNA nucleoside and at least one non-LNA modified nucleoside, such as at least one 2' substituted modified nucleoside, such as, for example, 2'-O-alkyl-RNA, 2'-O-methyl-RNA, 2'-alkoxy-RNA, 2'-O-methoxyethyl-RNA (MOE), 2'-amino-DNA, 2'-Fluoro-RNA, and 2'-F-ANA nucleoside(s). In some embodiments the mixed wing gapmer has one flank which comprises LNA nucleosides (e.g. 5' or 3') and the other flank (3' or 5' respectfully) comprises 2' substituted modified nucleoside(s).

The term conjugate as used herein refers to an oligonucleotide which is covalently linked to a non-nucleotide moiety (conjugate moiety or region C or third region).

Conjugation of the oligonucleotide of the invention to one or more non-nucleotide moieties may improve the pharmacology of the oligonucleotide, e.g. by affecting the activity, cellular distribution, cellular uptake or stability of the oligonucleotide. In some embodiments the conjugate moiety modify or enhance the pharmacokinetic properties of the oligonucleotide by improving cellular distribution, bioavailability, metabolism, excretion, permeability, and/or cellular uptake of the oligonucleotide. In particular the conjugate may target the oligonucleotide to a specific organ, tissue or cell type and thereby enhance the effectiveness of the oligonucleotide in that organ, tissue or cell type. A the same time the conjugate may serve to reduce activity of the oligonucleotide in non-target cell types, tissues or organs, e.g. off target activity or activity in non-target cell types, tissues or organs. WO 93/07883 and WO 2013/033230 provides suitable conjugate moieties. WO 2012/143379 provides a method of delivering a drug across the blood-brain-barrier by conjugation to an antibody fragment with affinity to the transferrin receptor.

Oligonucleotide conjugates and their synthesis has also been reported in comprehensive reviews by Manoharan in Antisense Drug Technology, Principles, Strategies, and Applications, S.T. Crooke, ed., Ch. 16, Marcel Dekker, Inc., 2001 and Manoharan, Antisense and Nucleic Acid Drug Development, 2002, 12, 103.

In an embodiment, the non-nucleotide moiety (conjugate moiety) is selected from the group consisting of carbohydrates, cell surface receptor ligands, drug substances, hormones, lipophilic substances, polymers, proteins, peptides, toxins (e.g. bacterial toxins), vitamins, viral proteins (e.g. capsids) or combinations thereof. In some embodiments the non-nucleotide moiety an antibody or antibody fragment, such as an antibody or antibody fragment that facilitates delivery across the blood-brain-barrier, in particular an antibody or antibody fragment targeting the transferrin receptor.

A linkage or linker is a connection between two atoms that links one chemical group or segment of interest to another chemical group or segment of interest via one or more covalent bonds. Conjugate moieties can be attached to the oligonucleotide directly or through a linking moiety (e.g. linker or tether). Linkers serve to covalently connect a third region, e.g. a conjugate moiety (Region C), to a first region, e.g. an oligonucleotide (region A).

In some embodiments of the invention the conjugate or oligonucleotide conjugate of the invention may optionally, comprise a linker region (second region or region B and/or region Y) which is positioned between the oligonucleotide (region A or first region) and the conjugate moiety (region C or third region).

Region B refers to biocleavable linkers comprising or consisting of a physiologically labile bond that is cleavable under conditions normally encountered or analogous to those encountered within a mammalian body. Conditions under which physiologically labile linkers undergo chemical transformation (e.g., cleavage) include chemical conditions such as pH, temperature, oxidative or reductive conditions or agents, and salt concentration found in or analogous to those encountered in mammalian cells. Mammalian intracellular conditions also include the presence of enzymatic activity normally present in a mammalian cell such as from proteolytic enzymes or hydrolytic enzymes or nucleases. In one embodiment the biocleavable linker is susceptible to S1 nuclease cleavage. In a preferred embodiment the nuclease susceptible linker comprises between 1 and 10 nucleosides, such as 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 nucleosides, more preferably between 2 and 6 nucleosides and most preferably between 2 and 4 linked nucleosides comprising at least two consecutive phosphodiester linkages, such as at least 3 or 4 or 5 consecutive phosphodiester linkages. Preferably the nucleosides are DNA or RNA. Phosphodiester containing biocleavable linkers are described in more detail in WO 2014/076195.

Region Y refers to linkers that are not necessarily biocleavable but primarily serve to covalently connect a conjugate moiety (region C or third region), to an oligonucleotide (region A or first region). The region Y linkers may comprise a chain structure or an oligomer of repeating units such as ethylene glycol, amino acid units or amino alkyl groups The oligonucleotide conjugates of the present invention can be constructed of the following regional elements A-C, A-B-C, A-BY-C, A-Y-B-C or A-Y-C. In some embodiments the linker (region Y) is an amino alkyl, such as a C2 - C36 amino alkyl group, including, for example C6 to C12 amino alkyl groups. In a preferred embodiment the linker (region Y) is a C6 amino alkyl group.

By the term "control" when used in relation to measurements of the effect of an oligonucleotide it is generally understood that the control is an untreated individual or target cell or a individual or target cell treated with a non-targeting oligonucleotide (mock). It may however also be an individual treated with the standard of care.

The term 'treatment' as used herein refers to both treatment of an existing disease (e.g. a disease or disorder as herein referred to), or prevention of a disease, i.e. prophylaxis. It will therefore be recognized that treatment as referred to herein may, in some embodiments, be prophylactic.

An aspect of the invention is to modulate the level of pig, primate or human UBE3A protein expression, in particular to increase the expression of paternal UBE3A expression in neuronal cells, in particular in human neuronal cells. The human UBE3A protein exists in several isoforms which are listed under Uniprot nr. Q05086. Several mutations in the maternal UBE3A gene can results in Angelman syndrome.

The target nucleic acid for the oligonucleotides of the invention is RNA, in particular a long non-coding RNA. The long non-coding RNA which is targeted by the oligonucleotides of the present invention is human SNHG14 (also known as UBE3A-ATS with Ensembl entry number ENSG00000224078, version GRCh38.p2). In particular the target nucleic acid is the region downstream of SNORD109B corresponding to position 25278410 to 25419462 on chromosome 15 (SEQ ID NO: 1). In Rhesus monkey (Macaca mulatta) the UBE3A supressor is defined as region downstream of SNORD109A corresponding to position 4222848 to 4373084 (forward strand) on chromosome 7 using the Ensembl assembly MMUL 1.0 (SEQ ID NO: 2).

In some embodiments, the target nucleic acid is SEQ ID NO: 1, or naturally occurring variants thereof.

In certain embodiments the target nucleic acid correspond to regions which are conserved between human (SEQ ID NO: 1) and Rhesus monkey (SEQ ID NO: 2). In certain embodiments target nucleic acid correspond to regions which are conserved between human (SEQ ID NO:1), Rhesus monkey (SEQ ID NO: 2) and mouse (SEQ ID NO: 3).

In certain embodiments the target nucleic acid is the region that is antisense to the UBE3A pre-mRNA, this region corresponds to position 55319 to 141053 of SEQ ID NO: 1.

In certain embodiments the target nucleic acid is the region that is downstream of SNORD109B and upstream of the region that is antisense to the UBE3A pre-mRNA, this region corresponds to position 1 to 55319 of SEQ ID NO: 1.

In some embodiments, the target nucleic acid is present in a cell, such as a mammalian cell in particular a human cell in vitro or in vivo (the target cell). In certain embodiments the target cell is a neuron, preferably a human neuronal cell.

The target sequence may be a sub-sequence of the target nucleic acid. In some embodiments the oligonucleotide targets sub-sequence selected from the group consisting of the antisense region of exon 9, exon10, exon13, exon14, intron 14, exon 15, intron15 and exon 16 of UBE3A. In some embodiments the oligonucleotide or contiguous nucleotide sequence hybridize or is complementary to a single stranded nucleic acid molecule selected from the group consisting of positions: 55319-76274, 77483-77573, 92157-93403 and 97056-97354 of SEQ ID NO: 1. In some embodiments the oligonucleotide or contiguous nucleotide sequence hybridize or is complementary to a single stranded nucleic acid molecule selected from the group consisting of positions: 60821-60849, 77567-77583, 92323-92339 and 97156-97172 of SEQ ID NO: 1.

In some embodiments the target nucleic acid is a region corresponding to positions 9200-9250 of SEQ ID NO: 1.

In some embodiments the target nucleic acid is a region corresponding to positions 11505-11555 of SEQ ID NO: 1.

In some embodiments the target nucleic acid is a region corresponding to positions 15100-15150 of SEQ ID NO: 1.

In some embodiments the target nucleic acid is a region corresponding to positions 30590-30740 of SEQ ID NO: 1.

In some embodiments the target nucleic acid is a region corresponding to positions 46380-46430 of SEQ ID NO: 1.

The invention relates to oligonucleotides capable of modulating expression of paternal UBE3A, in particular induction or up-regulation of paternally expressed UBE3A in neuronal cells . The modulation is achieved by hybridizing to a target nucleic acid located on the long non-coding RNA SNHG14 transcript downstream of SNORD109B. In certain embodiments the oligonucleotide of the invention hybridizes to a sub-sequence of the target nucleic acid of SEQ ID NO: 1 with a ΔG° below -10 kcal, such as with a ΔG° between -10 to -60 kcal, such as -12 to -40, such as from -15 to -30 kcal or-16 to -27 kcal such as -18 to -25 kcal.

The oligonucleotide of the invention is an antisense oligonucleotide which targets the pig, rhesus monkey and/or human SNHG14 transcript downstream of SNORD109B.

In some embodiments the antisense oligonucleotide of the invention is capable of modulating the expression of the target by removing, interfering with or decreasing the suppressor of the target. Preferably, the oligonucleotides of the invention induce UBE3A expression in a cell, in particular paternal UBE3A expression in a neuron, by degradation or removal of the SNHG14 transcript downstream of SNORD109B. In some embodiments the oligonucleotides of the invention are capable of increasing the expression of UBE3A by least 20% compared to the expression level of UBE3A in a neuronal cell treated with saline or a non-targeting oligonucleotide, more preferably by at least 30%, 35%, 40%, 45%, 50%, 55%, 60%, 80%, 100%, 120%, 150%, 160%, 170%, 180%, 190%, 200%, 210%, 220%, 230%, 240% or 250% compared to the expression level of UBE3A in a neuronal cell treated with saline or a non-targeting oligonucleotide. In additional embodiments the oligonucleotides of the invention are capable of decreasing the level of the SNHG14 transcript downstream of SNORD109B (in particular the part of the transcript that is antisense to the UBE3A pre-mRNA region) by at least 20% compared to the level of the SNHG14 transcript downstream of SNORD109B in a neuronal cell treated with saline or a non-targeting oligonucleotide, more preferably by at least 30%, 40%, 50%, 60%, 70%, 80%, 90% or 95% compared to the level of the SNHG14 transcript downstream of SNORD109B in a neuronal cell treated with saline or a non-targeting oligonucleotide, without reducing SNORD115 levels by more than 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 18%, 20%, 25% or 30% compared to the level of SNORD115 in a cell treated with saline or a non-targeting oligonucleotide. SNRPN and SNORD116 transcripts are located upstream from the SNORD115 transcript consequently if the SNORD115 transcript is not reduced by the oligonucleotide it is highly likely that the SNRPN and SNORD116 transcripts are also not reduced. In a further embodiment SNRPN and SNORD116 transcripts levels are not reduced by more than 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 18%, 20%, 25% or 30% compared to the level of SNRPN and SNORD116 in a cell treated with saline or a non-targeting oligonucleotide.

The target modulation is triggered by the hybridization between a contiguous nucleotide sequence of the oligonucleotide and the target nucleic acid. In some embodiments the oligonucleotide of the invention comprises mismatches between the oligonucleotide and the target nucleic acid. Despite mismatches hybridization to the target nucleic acid may still be sufficient to show a desired modulation of UBE3A expression. Reduced binding affinity resulting from mismatches may advantageously be compensated by increased number of nucleotides in the oligonucleotide and/or an increased number of modified nucleosides capable of increasing the binding affinity to the target, such as 2' modified nucleosides, including LNA, present within the oligonucleotide sequence.

An aspect of the present invention relates to an antisense oligonucleotide which comprises a contiguous nucleotide sequence of 10 to 30 nucleotides in length with at least 98% such as 100% complementarity to position 25278410 to 25419462 on human chromosome 15.

In some embodiments, the oligonucleotide comprises a contiguous sequence which is at least 98%, or 100% complementary with a region of the target nucleic acid shown as SEQ ID NO: 1, 2 or 3.

In a preferred embodiment the oligonucleotide of the invention, or contiguous nucleotide sequence thereof is fully complementary (100% complementary) to a region of the target nucleic acid shown as SEQ ID NO: 1, or in some embodiments may comprise one or two mismatches between the oligonucleotide and the target nucleic acid.

In some embodiments the oligonucleotide sequence is 100% complementary to a corresponding target nucleic acid region present in SEQ ID NO: 1 and SEQ ID NO: 2. In some embodiments the oligonucleotide sequence is 100% complementary to a corresponding target nucleic acid region present SEQ ID NO: 1, 2 and 3.

In some embodiments, the oligonucleotide comprises a contiguous nucleotide sequence of 10 to 30 nucleotides in length with at least 90% complementary, such as 100% complementarity, to a corresponding target nucleic acid region present in SEQ ID NO: 1, wherein the target nucleic acid region is selected from the group consisting of region A1 to A3649 in table 1 Reg. A Position in SEQ ID NO 1 Length Reg. A Position in SEQ ID NO 1 Length Reg. A Position in SEQ ID NO 1 Length from to from to from to 1 10 75 66 1218 50838 50864 27 2434 96887 96916 30 2 77 91 15 1219 50870 50884 15 2435 96928 96944 17 3 93 108 16 1220 50885 50911 27 2436 96946 96959 14 4 168 213 46 1221 50924 50937 14 2437 96970 96990 21 5 217 282 66 1222 50939 50974 36 2438 96992 97021 30 6 284 299 16 1223 50980 51008 29 2439 97023 97037 15 7 301 328 28 1224 51015 51030 16 2440 97039 97073 35 8 330 344 15 1225 51034 51047 14 2441 97075 97366 292 9 361 400 40 1226 51075 51089 15 2442 97368 97393 26 10 415 447 33 1227 51109 51123 15 2443 97420 97466 47 11 449 470 22 1228 51135 51172 38 2444 97469 97507 39 12 472 487 16 1229 51189 51216 28 2445 97513 97529 17 13 489 521 33 1230 51241 51260 20 2446 97531 97583 53 14 523 540 18 1231 51273 51294 22 2447 97585 97600 16 15 551 570 20 1232 51296 51312 17 2448 97602 97631 30 16 590 638 49 1233 51337 51357 21 2449 97633 97683 51 17 652 670 19 1234 51356 51381 26 2450 97685 97703 19 18 672 733 62 1235 51393 51465 73 2451 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33443 33456 14 2000 79522 79539 18 3216 123598 123634 37 784 33460 33501 42 2001 79568 79583 16 3217 123654 123683 30 785 33503 33535 33 2002 79574 79601 28 3218 123685 123706 22 786 33542 33557 16 2003 79603 79618 16 3219 123710 123774 65 787 34168 34181 14 2004 79617 79639 23 3220 123803 123816 14 788 34370 34385 16 2005 79651 79683 33 3221 123818 123831 14 789 35422 35435 14 2006 79685 79724 40 3222 123896 123939 44 790 35627 35641 15 2007 79721 79736 16 3223 123941 123974 34 791 35685 35700 16 2008 79727 79782 56 3224 123976 124021 46 792 35837 35851 15 2009 79784 79812 29 3225 124026 124040 15 793 35849 35864 16 2010 79809 79834 26 3226 124042 124079 38 794 35866 35879 14 2011 79841 79861 21 3227 124091 124109 19 795 35974 35987 14 2012 79873 79923 51 3228 124158 124185 28 796 36009 36042 34 2013 79928 79948 21 3229 124238 124274 37 797 36044 36079 36 2014 79950 79986 37 3230 124319 124332 14 798 36081 36097 17 2015 79993 80019 27 3231 124335 124373 39 799 36099 36120 22 2016 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