IP Library Granted Patent US 12,416,015
Granted Patent B2
US 12,416,015 · App. 16/646,999 · Granted Sep 16, 2025

Multiplex production and barcoding of genetically engineered cells

Inventors: Kevin Roy (Mountain View, CA); Justin D. Smith (Redwood City, CA); Robert P. St. Onge (San Francisco, CA); Lars M. Steinmetz (Stanford, CA); James E. Haber (Waltham, MA)
Assignees: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY; BRANDEIS UNIVERSITY
C12N15/85C12N9/22C12N15/1082C12N15/113C12N15/81C12N2310/20C12N2800/80
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Quick Facts
Patent No.
US 12,416,015
App. No.
16/646,999
Granted
Sep 16, 2025
Kind
B2
Abstract

The present disclosure relates to multiplex production and phenotyping of genetically engineered cells using RNA-guided nucleases and genomic barcoding. In particular, high-throughput multiplex genome editing is achieved utilizing a system that facilitates precise genome editing at desired target chromosomal loci by homology directed repair. Integration of guide RNA and donor DNA sequences as a genomic barcode at a separate chromosomal locus allows identification, isolation, and massively-parallel validation of individual variants from a pool of transformants. Strains can be arrayed according to their precise genetic modifications, as specified by donor DNA incorporation in heterologous or native genes. The present disclosure further relates to a method of editing codons outside of canonical guide RNA recognition regions, which enables complete saturation mutagenesis of protein-coding genes, a marker-based internal cloning method, which removes background due to oligonucleotide synthesis errors and incomplete vector backbone cleavage, and a method of enhancing homology directed repair by active donor recruitment.

Claims (45)

1. A method for localizing a donor polynucleotide to a genomic target locus in a target cell, the method comprising:

(a) transfecting a target cell with a first recombinant polynucleotide, the first recombinant polynucleotide comprising a genome editing cassette comprising:

(i) a promoter operably linked to a nucleic acid sequence encoding a guide RNA (gRNA) capable of hybridizing at a genomic target locus to be modified, and

(ii) a donor polynucleotide comprising a sequence to be integrated into the genomic target locus;

(b) transfecting the target cell with a second recombinant polynucleotide that encodes a first polypeptide and encodes a second polypeptide, wherein:

(i) the first polypeptide is an RNA-guided nuclease, wherein the RNA-guided nuclease when complexed with the gRNA recognizes and creates a DNA break at the genomic target locus; and

(ii) the second polypeptide is a donor recruitment protein, wherein the donor recruitment protein comprises:

(1) a DNA binding domain that binds to the donor polynucleotide, and

(2) a DNA break site localizing domain that binds to a region near the DNA break at the genomic target locus;

wherein the donor recruitment protein when bound to both the region near the DNA break site and to the donor polynucleotide selectively recruits the donor polynucleotide to the DNA break site, thereby localizing the donor polynucleotide to the genomic target locus,

wherein the DNA binding domain comprises a LexA DNA binding domain and the DNA break site localizing domain comprises a forkhead-associated (FHA) phosphothreonine-binding domain or comprises a TP53BP1 domain.

2. The method of claim 1 , wherein the RNA-guided nuclease modifies the genomic target locus by integrating the donor polynucleotide into the genomic target locus, thereby producing a genetically engineered cell.

3. The method of claim 1 , wherein the genome editing cassette comprises a unique polynucleotide barcode or the donor polynucleotide comprises a unique polynucleotide barcode.

4. The method of claim 1 , wherein the RNA-guided nuclease is a Cas nuclease or an engineered RNA-guided FokI-nuclease.

5. The method of claim 4 , wherein the Cas nuclease is Cas9 or Cpf1.

6. The method of claim 1 , wherein the donor recruitment protein exists independent of the first RNA-guided nuclease.

7. The method of claim 1 , wherein the recruitment protein comprises a LexA DNA binding domain linked to the DNA break site localizing domain comprising an FHA phosphothreonine-binding domain.

8. The method of claim 1 , wherein the first recombinant polynucleotide is circular and further comprises a second nucleic acid sequence encoding a second gRNA (guide X) capable of hybridizing with the first recombinant polynucleotide, wherein the guide X forms a complex with a nuclease in each cell such that the guide X-nuclease complex cleaves the first recombinant polynucleotide.

9. The method of 2 , wherein the genetically engineered cell is a genetically engineered therapeutic cell.

10. The method of 9 , wherein the genetically engineered therapeutic cell is a genetically engineered immune cell.

11. The method of 10 , wherein the genetically engineered immune cell is a T cell or a natural killer cell that targets a cancer.

12. The method of claim 3 , wherein the target cell is modified to harbor a barcode integration locus for integration of the unique polynucleotide barcode.

13. A kit comprising the first recombinant polynucleotide and the second recombinant polynucleotide used in the method of claim 1 .

14. A method for localizing a donor polynucleotide to a genomic target locus in a target cell, the method comprising:

(a) transfecting a target cell with a first recombinant polynucleotide, the first recombinant polynucleotide comprising a genome editing cassette comprising:

(i) a promoter operably linked to a nucleic acid sequence encoding a guide RNA (gRNA) capable of hybridizing at a genomic target locus to be modified, and

(ii) a donor polynucleotide comprising a sequence to be integrated into the genomic target locus;

(b) transfecting the target cell with a second recombinant polynucleotide that encodes a first polypeptide and encodes a second polypeptide, wherein:

(i) the first polypeptide is an RNA-guided nuclease, wherein the RNA-guided nuclease when complexed with the gRNA recognizes and creates a DNA break site at the genomic target locus; and

(ii) the second polypeptide is a donor recruitment protein, wherein the donor recruitment protein comprises:

(1) a DNA binding domain that binds to the donor polynucleotide, and

(2) a DNA break site localizing domain that binds to a region near the DNA break at the genomic target locus;

wherein the donor recruitment protein when bound to both the region near the DNA break site and to the donor polynucleotide selectively recruits the donor polynucleotide to the DNA break site, thereby localizing the donor polynucleotide to the genomic target locus; and

wherein the genome editing cassette comprises a unique polynucleotide barcode or the donor polynucleotide comprises a unique polynucleotide barcode.

15. A method for localizing a donor polynucleotide to a genomic target locus in a target cell, the method comprising:

(a) transfecting a target cell with a first recombinant polynucleotide, the first recombinant polynucleotide comprising a genome editing cassette comprising:

(i) a promoter operably linked to a nucleic acid sequence encoding a guide RNA (gRNA) capable of hybridizing at a genomic target locus to be modified, and

(ii) a donor polynucleotide comprising a sequence to be integrated into the genomic target locus;

(b) transfecting the target cell with a second recombinant polynucleotide that encodes a first polypeptide and encodes a second polypeptide, wherein:

(i) the first polypeptide is an RNA-guided nuclease, wherein the RNA-guided nuclease when complexed with the gRNA recognizes and creates a DNA break site at the genomic target locus; and

(ii) the second polypeptide is a donor recruitment protein, wherein the donor recruitment protein comprises:

(1) a DNA binding domain that binds to the donor polynucleotide, and

(2) a DNA break site localizing domain that binds to a region near the DNA break at the genomic target locus;

wherein the donor recruitment protein when bound to both the region near the DNA break site and to the donor polynucleotide selectively recruits the donor polynucleotide to the DNA break site, thereby localizing the donor polynucleotide to the genomic target locus; and

wherein the first recombinant polynucleotide is circular and further comprises a second nucleic acid sequence encoding a second gRNA (guide X) capable of hybridizing with the first recombinant polynucleotide, wherein the guide X forms a complex with a nuclease in each cell such that the guide X-nuclease complex cleaves the first recombinant polynucleotide.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 7, 2022
From: HABER, JAMES E
To: BRANDEIS UNIVERSITY
Reel/Frame 059185/0285 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 14, 2022
From: SMITH, JUSTIN D., MR.; ROY, KEVIN, MR.; STEINMETZ, LARS M., MR.
To: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY
Reel/Frame 058656/0436 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 22, 2021
From: ST. ONGE, ROBERT P.
To: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY
Reel/Frame 058181/0062 →
Continuity (2)
Provisional Application 62559493 · Sep 15, 2017
Related Publication 20200270632A1 · Aug 27, 2020
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