Transposition-based therapies
Gene therapy compositions and methods are provided that make use of novel transposases and/or chimeric transposases for targeted transposition.
1. A method for inserting a gene into the genome of a cell, comprising contacting the cell with a composition comprising a nucleic acid encoding a transposase enzyme, wherein the transposase enzyme comprises an amino acid sequence having at least 95% sequence identity to SEQ ID NO: 2 and has a non-polar aliphatic amino acid at position 2 of SEQ ID NO: 2,
wherein the transposase enzyme further comprises a substitution C13X2, wherein X2 is selected from lysine (K), arginine (R), and histidine (H).
2. The method of claim 1 , wherein the non-polar aliphatic amino acid is selected from alanine (A), glycine (G), valine (V), leucine (L), isoleucine (I), and proline (P).
3. The method of claim 2 , wherein the non-polar aliphatic amino acid is alanine (A).
4. The method of claim 1 , wherein the transposase enzyme further comprises a substitution S8X1, wherein X1 is selected from alanine (A), glycine (G), valine (V), leucine (L), isoleucine (I), and proline (P).
5. The method of claim 4 , wherein X1 is proline (P).
6. The method of claim 1 , wherein X2 is arginine (R).
7. The method of claim 1 , wherein the transposase enzyme does not have additional amino acid residues at the C terminus relative to SEQ ID NO: 2.
8. The method of claim 1 , wherein the transposase enzyme comprises an amino acid sequence having at least 98% identity to SEQ ID NO: 2.
9. The method of claim 1 , wherein the nucleic acid further encodes a transcription activator-like effector (TALE) DNA binding domain (DBD), or a nuclease-deficient Cas9 (dCas9) connected to the transposase enzyme.
10. The method of claim 9 , wherein the transposase enzyme is capable of inserting a transposon at a TA dinucleotide site or a TTAA tetranucleotide site in a genomic safe harbor site (GSHS) of the genome.
11. The method of claim 10 , wherein the TALE DBD or dCas9 is suitable for directing the transposase enzyme to the GSHS sequence.
12. The method of claim 11 , wherein the GSHS is selected from adeno-associated virus site 1 (AAVS1), chemokine (C-C motif) receptor 5 (CCR5) gene, and human Rosa26 locus.
13. The method of claim 1 , wherein the nucleic acid is co-formulated with a nucleic acid encoding a transposon comprising the gene.
14. The method of claim 13 , wherein the composition is in the form of a lipid nanoparticle (LNP).
15. A method for inserting a gene into the genome of a cell, comprising contacting the cell with a composition comprising a nucleic acid encoding a transposase enzyme,
wherein the transposase enzyme comprises an amino acid sequence having at least 95% sequence identity to SEQ ID NO: 2 and has a non-polar aliphatic amino acid at position 2 of SEQ ID NO: 2, wherein the transposase enzyme further comprises a substitution N125X3, wherein X3 is selected from is selected from lysine (K), arginine (R), and histidine (H).
16. The method of claim 15 , wherein X3 is lysine (K).
17. The method of claim 15 , wherein the non-polar aliphatic amino acid is selected from alanine (A), glycine (G), valine (V), leucine (L), isoleucine (I), and proline (P).
18. The method of claim 15 , wherein the nucleic acid further encodes a transcription activator-like effector (TALE) DNA binding domain (DBD), or a nuclease-deficient Cas9 (dCas9) connected to the transposase enzyme.
19. A method for inserting a gene into the genome of a cell, comprising contacting the cell with a composition comprising a nucleic acid encoding a transposase enzyme,
wherein the transposase enzyme comprises an amino acid sequence having at least 95% sequence identity to SEQ ID NO: 2 and has a non-polar aliphatic amino acid at position 2 of SEQ ID NO: 2, wherein the transposase enzyme further comprises two or more of substitutions S8P, C13R, and N125K.
20. The method of claim 19 , wherein the non-polar aliphatic amino acid is selected from alanine (A), glycine (G), valine (V), leucine (L), isoleucine (I), and proline (P).
21. The method of claim 20 , wherein the nucleic acid further encodes a transcription activator-like effector (TALE) DNA binding domain (DBD), or a nuclease-deficient Cas9 (dCas9) connected to the transposase enzyme.
22. A method for inserting a gene into the genome of a cell, comprising contacting the cell with a composition comprising a first nucleic acid encoding a transposase enzyme and a DNA binding domain and a second nucleic acid encoding a transposon,
wherein the transposase enzyme comprises an amino acid sequence having at least 97% sequence identity to SEQ ID NO: 2 and comprises two or more of substitutions of S8P, C13R, and N125K,
wherein the transposase enzyme is operatively linked to the DNA binding domain, and
wherein the first nucleic acid and second nucleic acid are contained in a LNP.
23. The method of claim 22 , wherein the DNA binding domain is a TALE DBD.
24. The method of claim 22 , wherein the DNA binding domain is a dCas9.
25. The method of claim 23 , wherein the transposase enzyme does not have additional amino acid residues at the C terminus relative to SEQ ID NO: 2.
26. The method of claim 25 , wherein the substitutions are S8P and C13R.
27. The method of claim 24 , wherein the transposase enzyme does not have additional amino acid residues at the C terminus relative to SEQ ID NO: 2.
28. The method of claim 27 , wherein the substitutions are S8P and C13R.