Methods and compositions for multiplex RNA guided genome editing and other RNA technologies
The invention includes materials and methods to generate numerous small RNAs from one polynucleotide construct (synthetic gene) to facilitate RNA-guided multiplex genome editing, modification, inhibition of expression and other RNA-based technologies. The synthetic gene/polynucleotide construct encodes polycistronic RNA components separated by tRNAs, and preferably also includes regulatory components such as a promoter or terminator to form an expression cassette. Once transcribed in a cell, the transcript is processed by the cell to multiple RNA molecules by the endogenous tRNA processing system. The system can be used for any RNA based gene manipulation method including RNA-mediated genome editing, artificial microRNA mediated gene silencing, small RNA mediated genetic manipulation, double-stranded RNA mediated gene silencing, antisense mechanisms and the like.
1. A method for producing multiplex RNA mediated genetic manipulation in a recipient cell comprising:
obtaining a polynucleotide construct which encodes two or more guide RNA sequences in tandem array with one or more tRNA cleavage sequence, wherein each guide RNA sequence comprises a 5′ spacer sequence that hybridizes to a target sequence; and introducing said polynucleotide construct to said recipient cell in the presence of a CRISPR-associated nuclease, so that said recipient cell's tRNA processing system cleaves the transcript produced from the transcribed polynucleotide construct at the tRNA sequences to release the guide RNA sequences.
2. The method of claim 1 wherein said guide RNA sequences target multiple sites within a single gene in said recipient cell.
3. The method of claim 1 wherein said guide RNA sequences target multiple different genes in said recipient cell.
4. The method of claim 1 wherein said RNA mediated genetic manipulation is RNA guided genome editing, wherein said RNA guided genome editing includes targeted mutation, homology-dependent repair, transcriptional activation and repression, epigenome editing, and/or genomic labeling.
5. The method of claim 1 wherein said tRNA cleavage sequence includes a pretRNA acceptor stem, a D-loop arm and a TΨC-loop arm.
6. The method of claim 1 wherein said tRNA cleavage sequence includes an active site for one or more of RNase P and/or RNase Z and/or RNase E.
7. The method of claim 1 wherein said tRNA cleavage sequence is SEQ ID NO: 13, 188 or 189.
8. The method of claim 1 wherein said guide RNA further comprises a scaffold RNA sequence.
9. The method of claim 1 wherein said polynucleotide construct includes a tRNA-guide RNA-tRNA.
10. The method of claim 1 wherein said recipient cell is a plant cell.
11. The method of claim 1 wherein said recipient cell is an animal cell.
12. The method of claim 1 wherein said cell is a microbial cell.
13. The method of claim 1 wherein said cell is a human cell.
14. A nucleic acid construct for multiplex RNA mediated genome manipulation in a recipient cell comprising: two or more guide RNA sequences in tandem array with one or more tRNA cleavage sequence, wherein each guide RNA sequence comprises a 5′ spacer sequence that hybridizes to a target sequence.
15. The nucleic acid construct of claim 14 wherein said guide RNA sequences target multiple sites within a single gene in said recipient cell.
16. The nucleic acid construct of claim 14 wherein said guide RNA sequences target multiple different genes in said recipient cell.
17. The nucleic acid construct of claim 14 wherein said tRNA cleavage sequence includes a pretRNA acceptor stem, a D-loop arm and a TΨC-loop arm.
18. The nucleic acid construct of claim 14 wherein said tRNA cleavage sequence includes an active site for one or more of RNase P and/or RNase Z and/or RNase E.
19. The nucleic acid construct of claim 14 wherein said tRNA cleavage sequence is SEQ ID NO: 13, 188 or 189.
20. The nucleic acid construct of claim 14 wherein said guide RNA further comprises a scaffold RNA sequence.
21. The nucleic acid construct of claim 14 wherein said nucleic acid construct includes a tRNA-guide RNA-tRNA.
22. The nucleic acid construct of claim 14 further comprising regulatory element for expression of said nucleic acid in said recipient cell.
23. The nucleic acid construct of claim 22 wherein said construct comprises a promoter sequence operably linked to said guide RNA sequences and said tRNA cleavage sequence.
24. The nucleic acid construct of claim 14 further comprising a terminator sequence.
25. The nucleic acid construct of claim 23 wherein said promoter sequence is a Pol III promoter.
26. The nucleic acid construct of claim 24 wherein said terminator sequence is a Pol III terminator.
27. An expression cassette comprising the nucleic acid construct of claim 14 .
28. A vector comprising the expression cassette of claim 27 .
29. A recipient cell comprising the nucleic acid construct of claim 14 .
30. A genetically modified cell comprising a genomic insertion or deletion said cell having been edited by the introduction of the construct of claim 14 .
31. The cell of claim 30 wherein said cell is a plant cell.
32. The cell of claim 30 wherein said cell is an animal cell.
33. The cell of claim 30 wherein said cell is a microbial cell.
34. The cell of claim 30 wherein said cell is a human cell.