Synthetic transcriptional and epigenetic regulators based on engineered, orthogonal zinc finger proteins
Embodiments disclosed herein provide artificial expression systems comprising the zinc-finger containing transcription factors and engineered promoters to modulate expression of genes of interest. Engineered zinc-finger transcription factors that interact with engineered promoters constitute synthetic and regulatable expression systems which facilitate the modulation of gene expression as desired.
1. An engineered responsive promoter comprising (a) at least one target DNA sequence element selected from the group consisting of 5′-CGTCGAAGTCGAAGTCGACC-3′ (SEQ ID NO: 81), 5′-GGACGACGTTACGGACGTAC-3′ (SEQ ID NO: 82), 5′-A GACGTCGAAGTAGCCGTAG-3′ (SEQ ID NO: 83), 5′-GGACGACGCCGATGTAGAAG-3′ (SEQ ID NO: 84), 5′-TGAAGCAGTCGACGCCGAAG-3′ (SEQ ID NO: 85), 5′-GGACGACGCGGTCTAAGAAG-3′ (SEQ ID NO: 86), 5′-CGACGAGGTCGCATAAGTAG-3′ (SEQ ID NO: 87), 5′-AGACGCAGTATAGGTCGAAC-3′ (SEQ ID NO: 88), 5′-AGACGCAGTATAGGACGACG-3′ (SEQ ID NO: 89), 5′-CGGCGTAGCCGATGTCGCGC-3′ (SEQ ID NO: 90), and 5′-GGTCGTTGCGGTAGTCGAAG-3′ (SEQ ID NO: 91) and (b) a promoter sequence, wherein the at least one target DNA sequence element is operably linked at the 5′ end of the promoter sequence in order to influence transcription initiation of a nearby coding sequence.
2. An engineered gene expression system for the in vivo or in vitro regulatable expression of an exogenous gene, the system comprising:
a) an engineered zinc-finger-containing synthetic transcription factor (synTF) protein comprising two main domains: (a) a first main domain which is a DNA-binding zinc finger protein domain (ZF protein domain), and (b) a second domain through which the synTF exerts its effect (effector domain) having the formula I: [ZF protein domain]-[effector domain] or the formula IV: [effector domain]-[ZF protein domain], wherein the ZF protein domain is modular in design and is composed zinc finger arrays (ZFA), wherein there is one to ten ZFAs, wherein the ZFA comprises the sequence: N′-[(formula II)-L 2 ] 6-8 -C′, wherein formula II is that of a ZF motif and is [X 0-3 CX 1-5 CX 2-7 -(helix)-HX 3-6 H] (SEQ ID NO: 19), where the subscript 6-8 indicates the number of ZF motifs in a ZFA, wherein the ZF motifs are linked together by L 2 , wherein L 2 is a linker peptide having 4-6 amino acid residues, and wherein N′- and C′- indicates the N-terminus and C-terminus, respectively, of the sequence, and
b) an engineered responsive promoter comprising
i) at least one orthogonal target DNA sequence element selected from the group consisting of 5′-CGTCGAAGTCGAAGTCGACC-3′ (SEQ ID NO: 81), 5′-GGACGACGTTACGGACGTAC-3′ (SEQ ID NO: 82), 5′-A GACGTCGAAGTAGCCGTAG-3′ (SEQ ID NO: 83), 5′-GGACGACGCCGATGTAGAAG-3′ (SEQ ID NO: 84), 5′-TGAAGCAGTCGACGCCGAAG-3′ (SEQ ID NO: 85), 5′-GGACGACGCGGTCTAAGAAG-3′ (SEQ ID NO: 86), 5′-CGACGAGGTCGCATAAGTAG-3′ (SEQ ID NO: 87), 5′-AGACGCAGTATAGGTCGAAC-3′ (SEQ ID NO: 88), 5′-AGACGCAGTATAGGACGACG-3′ (SEQ ID NO: 89), 5′-CGGCGTAGCCGATGTCGCGC-3′ (SEQ ID NO: 90), and 5′-GGTCGTTGCGGTAGTCGAAG-3′ (SEQ ID NO: 91), and,
ii) a promoter sequence, wherein the at least one target DNA sequence element is operably linked to the 5′ end of the promoter sequence in order to influence transcription initiation of a nearby coding sequence, wherein the influence is to upregulate or downregulate transcription initiation, and wherein the gene is operably linked to the promoter in the engineered responsive promoter,
wherein the ZFA of the synTF is capable of binding the at least one orthogonal target DNA sequence element in the engineered responsive promoter.
3. The system of claim 2 , wherein formula II is [X 3 CX 2 CX 5 -(helix)-HX 3 H] (SEQ ID NO: 20).
4. The system of claim 2 , wherein all of the helices of each ZFA or at least four of the helices in each ZFA comprise a sequence selected from the group consisting of: SEQ ID NO: 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, and 80.
5. The system of claim 2 , wherein the effector domain of the synTF is a transcription activating domain, or a transcription repressor domain, or an epigenetic effector domain.
6. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 22, 23, 24, 25, 26, 27, 28, 29, and 30, and the ZFA is capable of binding the sequence of SEQ ID NO: 81.
7. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 31, 32, 33, 34, 35, 36, 37, 38 and 39, and the ZFA is capable of binding the sequence of SEQ ID NO: 82.
8. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 31, 38, 40, 41, 42, 43, 44, and 45, and the ZFA is capable of binding the sequence of SEQ ID NO: 83.
9. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 26, 35, 36, 46, 47, 40, 48, 49, 50, and 51, and the ZFA is capable of binding the sequence of SEQ ID NO: 84.
10. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 52, 53, 54, 55, 56, 57, 58, and 59, and the ZFA is capable of binding the sequence of SEQ ID NO: 85.
11. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 26, 30, 35, 36, 48, 49, 60, 61, 62, and 63, and the ZFA is capable of binding the sequence of SEQ ID NO: 86.
12. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 30, 31, 49, 64, 65, 66, 67, 68, and 69, and the ZFA is capable of binding the sequence of SEQ ID NO: 87.
13. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 30, 31, 49, 70, 71, 72, 73, and 74, and the ZFA is capable of binding the sequence of SEQ ID NO: 88.
14. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of ZF motif helices selected from the group consisting of: SEQ ID NO: 31, 35, 36, 48, 49, 71, and 72, and the ZFA is capable of binding the sequence of SEQ ID NO: 89.
15. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of a ZFA helix combo, comprising ZF 10, selected from the group consisting of: SEQ ID NO: 30, 31, 47, 50, 75 and 76, and the at least one ZFA is capable of binding the sequence of SEQ ID NO: 90.
16. The system of claim 2 , wherein the ZFA of the synTF comprises, consists of, or consist essentially of a ZFA helix combo, ZF 11-1, selected from the group consisting of: SEQ ID NO: 31, 63, 77, 78, 79, and 80, and the at least one ZFA is capable of binding the sequence of SEQ ID NO: 91.
17. A method of regulating gene activation or repression comprising contacting a cell with an engineered gene expression system of claim 2 .
18. A kit for regulating gene activation or repression, the kit comprising an engineered expression system comprising
a) an engineered zinc-finger-containing synthetic transcription factor (synTF) protein comprising two main domains: (a) a first main domain which is a DNA-binding zinc finger protein domain (ZF protein domain), and (b) a second domain through which the synTF exerts its effect (effector domain) having the formula I: [ZF protein domain]-[effector domain] or the formula IV: [effector domain]-[ZF protein domain], wherein the ZF protein domain is modular in design and is composed zinc finger arrays (ZFA), wherein there is one to ten ZFAs, wherein the ZFA comprises the sequence: N′-[(formula II)-L 2 ] 6-8 -C′, wherein formula II is that of a ZF motif and is [X 0-3 CX 1-5 CX 2-7 -(helix)-HX 3-6 H] (SEQ ID NO: 19), where the subscript 6-8 indicates the number of ZF motifs in a ZFA, wherein the ZF motifs are linked together by L 2 , wherein L 2 is a linker peptide having 4-6 amino acid residues, and wherein N′- and C′- indicates the N-terminus and C-terminus, respectively, of the sequence, and
b) an engineered responsive promoter comprising
i) at least one orthogonal target DNA sequence element selected from the group consisting of 5′-CGTCGAAGTCGAAGTCGACC-3′ (SEQ ID NO: 81), 5′-GGACGACGTTACGGACGTAC-3′ (SEQ ID NO: 82), 5′-A GACGTCGAAGTAGCCGTAG-3′ (SEQ ID NO: 83), 5′-GGACGACGCCGATGTAGAAG-3′ (SEQ ID NO: 84), 5′-TGAAGCAGTCGACGCCGAAG-3′ (SEQ ID NO: 85), 5′-GGACGACGCGGTCTAAGAAG-3′ (SEQ ID NO: 86), 5′-CGACGAGGTCGCATAAGTAG-3′ (SEQ ID NO: 87), 5′-AGACGCAGTATAGGTCGAAC-3′ (SEQ ID NO: 88), 5′-AGACGCAGTATAGGACGACG-3′ (SEQ ID NO: 89), 5′-CGGCGTAGCCGATGTCGCGC-3′ (SEQ ID NO: 90), and 5′-GGTCGTTGCGGTAGTCGAAG-3′ (SEQ ID NO: 91), and
ii) a promoter sequence, wherein the at least one target DNA sequence element is operably linked to the 5′ end of the promoter sequence in order to influence transcription initiation of a nearby coding sequence, wherein the influence is to upregulate or downregulate transcription initiation, and wherein the gene is operably linked to the promoter in the engineered responsive promoter,
wherein the ZFA of the synTF is capable of binding the at least one orthogonal target DNA sequence element in the engineered responsive promoter, and
c) reagents and instructions for use thereof.