IP Library › Granted Patent US 12,378,566
Granted Patent B2
US 12,378,566 · App. 18/055,614 · Granted Aug 5, 2025

Plant genome modification using guide RNA/Cas endonuclease systems and methods of use

Inventors: Andrew Mark Cigan (Madison, WI); Saverio Carl Falco (Wilmington, DE); Huirong Gao (Johnston, IA); Zhongsen Li (Hockessin, DE); Zhan-Bin Liu (Clive, IA); L. Aleksander Lyznik (Johnston, IA); Jinrui Shi (Johnston, IA); Sergei Svitashev (Johnston, IA); Joshua K. Young (Johnston, IA)
Assignees: PIONEER HI-BRED INTERNATIONAL, INC.; E.I. DU PONT DE NEMOURS AND COMPANY
C12N15/8213C12N15/00C12N15/63C12N15/8205C12N15/8207C12N15/8216C12N15/8247C12N15/8262A01H1/00
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Quick Facts
Patent No.
US 12,378,566
App. No.
18/055,614
Granted
Aug 5, 2025
Kind
B2
Abstract

Compositions and methods are provided for genome modification of a target sequence in the genome of a plant or plant cell. The methods and compositions employ a guide RNA/Cas endonuclease system to provide an effective system for modifying or altering target sites within the genome of a plant, plant cell or seed. Also provided are compositions and methods employing a guide polynucleotide/Cas endonuclease system for genome modification of a nucleotide sequence in the genome of a cell or organism, for gene editing, and/or for inserting or deleting a polynucleotide of interest into or from the genome of a cell or organism. Once a genomic target site is identified, a variety of methods can be employed to further modify the target sites such that they contain a variety of polynucleotides of interest. Breeding methods and methods for selecting plants utilizing a two component RNA guide and Cas endonuclease system are also disclosed. Compositions and methods are also provided for editing a nucleotide sequence in the genome of a cell.

Claims (20)

1. A method for modifying a target site in the genome of a plant cell, the method comprising:

transforming at least one plant cell with a guide polynucleotide, a polynucleotide sequence encoding a Cas endonuclease, and an expression cassette encoding at least one developmental gene polypeptide, wherein the at least one developmental gene polypeptide comprises a Babyboom (BBM), an Ovule Development Protein 2 (ODP2), and/or a Wuschel (WUS) polypeptide, wherein the guide polynucleotide and the Cas endonuclease form a guide polynucleotide-Cas endonuclease complex that introduces a double-strand break at the target site in the plant cell, and wherein the at least one developmental gene polypeptide increases the frequency of modification of the target site by the guide polynucleotide-Cas endonuclease complex in the plant cell relative to a control plant cell comprising a guide polynucleotide-Cas endonuclease complex and not comprising an expression cassette encoding a developmental gene polypeptide; and

regenerating a plantlet or a plant from the plant cell, the plantlet or plant comprising a modified target site, wherein the plantlet or the plant does not contain the Cas endonuclease or the expression cassette encoding the at least one developmental gene polypeptide.

2. The method of claim 1 , wherein the at least one plant cell is an embryogenic plant cell.

3. The method of claim 2 , wherein the embryogenic plant cell is transformed by particle bombardment.

4. The method of claim 2 , wherein the at least one plant cell comprises a plurality of embryogenic plant cells and the double-strand break at the target site is induced in the plurality of embryogenic plant cells at a frequency of at least 10.1%.

5. The method of claim 1 , wherein the at least one plant cell is an embryo.

6. The method of claim 5 , wherein the embryo is transformed by particle bombardment or bacterial-mediated transformation.

7. The method of claim 5 , wherein the at least one plant cell comprises a plurality of embryos and the double-strand break at the target site is induced in the plurality of embryos at a frequency of at least 33%.

8. The method of claim 2 , wherein the modified target site comprises at least one nucleotide insertion, deletion, or substitution.

9. The method of claim 2 , wherein the modified target site is a promoter sequence, a terminator sequence, a regulatory element sequence, a splice site, a coding sequence, a polyubiquitination site, an intron site, an intron-enhancing motif, or a gene of interest.

10. The method of claim 2 , wherein the plant cell is monocot or dicot.

11. The method of claim 10 , wherein the monocot is maize, rice, sorghum, rye, barley, wheat, millet, oats, sugarcane, turfgrass, or switchgrass.

12. The method of claim 10 , wherein the dicot is soybean, canola, alfalfa, sunflower, cotton, tobacco, peanut, potato, Arabidopsis , or safflower.

13. The method of claim 2 , further comprising transforming the at least one plant cell with a polynucleotide modification template comprising at least one nucleotide modification relative to a polynucleotide sequence of the target site.

14. The method of claim 2 , wherein the polynucleotide sequence encoding the Cas endonuclease comprises a Cas coding region that is operably linked to a first nuclear localization signal upstream of the Cas coding region and a second nuclear localization signal downstream of the Cas coding region, wherein the first nuclear localization signal and the second nuclear localization signal are derived from different sources.

15. The method of claim 14 , wherein the first nuclear localization signal is a monopartite nuclear localization signal.

16. The method of claim 14 , wherein the second nuclear localization signal is a bipartite nuclear localization signal.

17. The method of claim 1 , wherein the plant cell is a non-protoplast plant cell.

18. The method of claim 1 , wherein the plant cell is transformed with the one or more expression cassettes by particle bombardment or bacterial-mediated transformation.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 10, 2025
From: CIGAN, ANDREW MARK; GAO, HUIRONG; FALCO, SAVERIO CARL; LI, ZHONGSEN; LIU, ZHAN-BIN; LYZNIK, LESZEK ALEKSANDER; SHI, JINRUI; SVITASHEV, SERGEI; YOUNG, JOSHUA K.
To: PIONEER HI-BRED INTERNATIONAL, INC.
Reel/Frame 070796/0001 →
Continuity (7)
Continuation 14913614
Provisional Application 62023239 · Jul 11, 2014
Provisional Application 61953090 · Mar 14, 2014
Provisional Application 61937045 · Feb 7, 2014
Provisional Application 61882532 · Sep 25, 2013
Provisional Application 61868706 · Aug 22, 2013
Related Publication 20230323374A1 · Oct 12, 2023
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