Modified guide RNAs, CRISPR-ribonucleotprotein complexes and methods of use
Described herein are modified guide RNAs such as a single guide RNA including, from 5′ to 3′, a single-stranded protospacer sequence, a first complementary strand of a binding region for the Cas9 polypeptide, an aptamer that binds a biotin-binding molecule, and a second complementary strand of the binding region for the Cas9 polypeptide. Also described is an RNP complex including the modified guide RNA and a Cas9 polypeptide or active fragment thereof. Also included are methods of modifying target genes in cells using the modified guide RNAs.
1. A ribonucleoprotein (RNP) complex, comprising
a modified guide RNA comprising,
a crRNA comprising a single-stranded protospacer sequence and a first complementary strand of a binding region for a Cas9 polypeptide,
a tracrRNA comprising a second complementary strand of the binding region for the Cas9 polypeptide,
wherein the crRNA or the tracrRNA comprises a nucleic acid aptamer that binds an avidin,
wherein the crRNA and the tracrRNA hybridize through the first and second complementary strands of the binding region for the Cas9 polypeptide;
an avidin
the Cas9 polypeptide, wherein the Cas9 polypeptide is active for guide RNA binding, and has an active, inactive or partially inactive nuclease domain, and
a biotinylated molecule.
2. The RNP complex of claim 1 , wherein the avidin has one, two or four biotin binding sites, and wherein the avidin optionally comprises a fluorescent label.
3. The RNP complex of claim 1 , wherein the biotinylated molecule is a biotinylated donor polynucleotide.
4. The RNP complex of claim 3 , wherein the donor polynucleotide comprises single-stranded DNA, double-stranded DNA, RNA, or a duplex of RNA and DNA.
5. The RNP complex of claim 3 , wherein the donor polynucleotide includes a mutation, deletion, alteration, integration, gene correction, gene replacement, transgene insertion, nucleotide deletion, gene disruption, and/or gene mutation in a target nucleic acid.
6. The RNP complex of claim 1 , wherein the biotinylated molecule comprises a biotinylated nanoparticle, dye, contrast agent, or peptide.
7. The RNP complex of claim 6 , wherein the nanoparticle is a quantum dot, a gold particle, a magnetic particle, or a polymeric nanoparticle.
8. The RNP complex of claim 1 , wherein the avidin is covalently linked to a donor polynucleotide, either directly or via a linker molecule.
9. The RNP complex of claim 8 , wherein the donor polynucleotide comprises single-stranded DNA, double-stranded DNA, RNA, or a duplex of RNA and DNA.
10. The RNP complex of claim 8 , wherein the donor polynucleotide includes a mutation, deletion, alteration, integration, gene correction, gene replacement, transgene insertion, nucleotide deletion, gene disruption, and/or gene mutation in a target nucleic acid.
11. The RNP complex of claim 1 , wherein the avidin is covalently linked to a nanoparticle, dye molecule, or a peptide, either directly or via a linker molecule.
12. A kit comprising
a modified guide RNA, the modified guide RNA comprising,
a crRNA comprising, a single-stranded protospacer sequence and a first complementary strand of a binding region for a Cas9 polypeptide, and
a tracrRNA comprising, a second complementary strand of the binding region for the Cas9 polypeptide,
wherein the crRNA or the tracrRNA comprises a nucleic acid aptamer that binds an avidin,
wherein the crRNA and the tracrRNA hybridize through the first and second complementary strands of the binding region for the Cas9 polypeptide;
an avidin;
a Cas9 polypeptide, and
a biotinylated molecule.
13. A method of modifying a target nucleic acid in a cell, comprising
delivering to the cell an RNP complex, the RNP complex comprising
a modified guide RNA comprising,
a crRNA comprising a single-stranded protospacer sequence and a first complementary strand of a binding region for a Cas9 polypeptide,
a tracrRNA comprising a second complementary strand of the binding region for the Cas9 polypeptide,
wherein the crRNA or the tracrRNA comprises a nucleic acid aptamer that binds an avidin,
wherein the crRNA and the tracrRNA hybridize through the first and second complementary strands of the binding region for the Cas9 polypeptide;
an avidin; and
the Cas9 polypeptide, wherein the Cas9 polypeptide is active for guide RNA binding, and has an active, inactive or partially inactive nuclease domain,
wherein the single-stranded protospacer sequence of the modified guide RNA hybridizes to a sequence in the target nucleic acid to be modified.
14. The method of claim 13 , wherein modifying the target nucleic acid increases or decreases expression of a gene product of the target nucleic acid.
15. The method of claim 13 , further comprising delivering a donor polynucleotide to the cell, and wherein modifying the target nucleic acid comprises homology-directed repair (HDR).
16. The method of claim 13 , further comprising delivering a donor polynucleotide to the cell, and wherein modifying the target nucleic acid comprises addition of a genetically encoded functionality, or correction of a mutation in the target nucleic acid.
17. The method of claim 13 , wherein modifying the target nucleic acid creates a double strand break (DSB) which is repaired by a non-homologous end joining (NHEJ) cell repair mechanism generating indels thereby modifying the polynucleotide sequence of the target nucleic acid.
18. The method of claim 13 , further comprising delivering a donor polynucleotide to the cell, and wherein modifying the target nucleic acid creates a DSB which is repaired by a HDR cell repair mechanism incorporating a donor DNA sequence thereby modifying the polynucleotide sequence of the target nucleic acid.
19. The method of claim 13 , further comprising delivering a biotinylated molecule, wherein the biotinylated molecule targets the RNP complex to a specific cell type, organ or tissue.
20. The method of claim 13 , wherein the RNP complex further comprises a biotinylated molecule.
21. The method of claim 20 , wherein the biotinylated molecule is a biotinylated donor polynucleotide.
22. The method of claim 21 , wherein the donor polynucleotide comprises single-stranded DNA, double-stranded DNA, RNA, or a duplex of RNA and DNA.
23. The method of claim 21 , wherein the donor polynucleotide includes a mutation, deletion, alteration, integration, gene correction, gene replacement, transgene insertion, nucleotide deletion, and/or gene disruption.
24. A method of modifying a target nucleic acid in a cell, comprising delivering to the cell two RNP complexes, wherein each RNP complex comprises
a modified guide RNA comprising,
a crRNA comprising a single-stranded protospacer sequence and a first complementary strand of a binding region for a Cas9 polypeptide,
a tracrRNA comprising a second complementary strand of the binding region for the Cas9 polypeptide,
wherein the crRNA or the tracrRNA comprises a nucleic acid aptamer that binds an avidin,
wherein the crRNA and the tracrRNA hybridize through the first and second complementary strands of the binding region for the Cas9 polypeptide;
an avidin; and
a Cas9 polypeptide, wherein the Cas9 polypeptide is active for guide RNA binding, and has an active, inactive or partially inactive nuclease domain,
wherein each of the RNP complexes hybridizes to a different sequence in the target nucleic acid.
25. The method of claim 24 , further comprising delivering a donor polynucleotide to the cell, wherein the donor polynucleotide comprises a gene correction relative to the sequence of the target nucleic acid, thereby providing multiple allelic correction of the target nucleic acid, or excision of target DNA from the target nucleic acid.
26. The method of claim 24 , further comprising delivering a donor polynucleotide to the cell, wherein the donor polynucleotide comprises a gene correction relative to the sequence of the target nucleic acid, thereby providing multiple allelic correction of the target nucleic acid.
27. The method of claim 24 , wherein modifying the target nucleic acid provides excision of genomic DNA.
28. The method of claim 24 , wherein each RNP complex further comprises a biotinylated molecule.
29. The method of claim 28 , wherein the biotinylated molecules are biotinylated donor polynucleotides.
30. The method of claim 29 , wherein the donor polynucleotides comprise single-stranded DNA, double-stranded DNA, RNA, or a duplex of RNA and DNA.
31. The method of claim 29 , wherein the donor polynucleotides include a mutation, deletion, alteration, integration, gene correction, gene replacement, transgene insertion, nucleotide deletion, and/or gene disruption.
32. A method of modifying a target nucleic acid in a cell, the cell comprising a Cas9 polypeptide, wherein the Cas9 polypeptide is active for guide RNA binding, and has an active, inactive or partially inactive nuclease domain, the method comprising
delivering to the cell a modified guide RNA, the modified guide RNA comprising,
a crRNA comprising, a single-stranded protospacer sequence and a first complementary strand of a binding region for the Cas9 polypeptide, and
a tracrRNA comprising, a second complementary strand of the binding region for a Cas9 polypeptide,
wherein the crRNA or the tracrRNA comprises a nucleic acid aptamer that binds an avidin,
wherein the crRNA and the tracrRNA hybridize through the first and second complementary strands of the binding region for the Cas9 polypeptide;
wherein the modified guide RNA is associated with an avidin; and
wherein the single-stranded protospacer sequence of the modified guide RNA hybridizes to a sequence in the target nucleic acid to be modified.
33. The method of claim 32 , wherein two modified guide RNAs are delivered to the cell, and wherein each of the modified guide RNAs hybridizes to a different nucleic acid sequence.
34. The method of claim 32 , further comprising delivering a donor polynucleotide to the cell, wherein the donor polynucleotide comprises a gene correction relative to the sequence of the target nucleic acid, thereby providing multiple allelic correction of the target nucleic acid, or excision of target DNA from the target nucleic acid.
35. A method of modifying a target nucleic acid in a cell, comprising
delivering to the cell a vector expressing a modified guide RNA, a vector expressing a Cas9 polypeptide, an avidin, and a biotinylated donor DNA template, the modified guide RNA comprising,
a crRNA comprising, a single-stranded protospacer sequence and a first complementary strand of a binding region for the Cas9 polypeptide, and
a tracrRNA comprising, a second complementary strand of the binding region for the Cas9 polypeptide,
wherein the crRNA or the tracrRNA comprises a nucleic acid aptamer that binds the avidin,
wherein the crRNA and the tracrRNA hybridize through the first and second complementary strands of the binding region for the Cas9 polypeptide,
wherein the single-stranded protospacer sequence of the modified guide RNA hybridizes to a sequence in the target nucleic acid to be modified.
36. The method of claim 35 , wherein the cell is a human cell.
37. The method of claim 36 , wherein the human cell is a human pluripotent stem cell line, or a primary blood cell.