Granted Patent
B2
US 12,365,915 · App. 17/531,172 · Granted Jul 22, 2025
Universal donor cells
Assignee:
CRISPR THERAPEUTICS AG
C12N15/85C07K14/70532C07K14/70539C12N5/0606C12N5/0607C12N5/0676C12N5/0696C12N9/22C12N15/11C12N15/907C12N2310/20C12N2506/02C12N2506/03C12N2506/45C12N2800/80
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Abstract
Genetically modified cells that are compatible with multiple subjects, e.g., universal donor cells, and methods of generating the genetically modified cells are provided herein. The universal donor cells comprise at least one genetic modification within or near at least one gene that encodes one or more MHC-I or MHC-II human leukocyte antigens or component or transcriptional regulator of the MHC-I or MHC-II complex, at least one genetic modification that increases the expression of at least one polynucleotide that encodes a tolerogenic factor, and optionally at least one genetic modification that increases or decreases the expression of at least one gene that encodes a survival factor.
Claims (24)
1. An in vitro method for generating a genetically modified cell, the method comprising delivering to a cell:
(a) an RNA-guided nuclease;
(b) a guide RNA targeting a target site in a beta-2-microglobulin (B2M) gene locus; and
(c) a nucleic acid comprising (i) a nucleotide sequence homologous with a region located left of the target site in the B2M gene locus, (ii) a nucleotide sequence encoding a tolerogenic factor, and (iii) a nucleotide sequence homologous with a region located right of the target site in the B2M gene locus; wherein the tolerogenic factor is programmed death ligand 1 (PD-L1) or a human leukocyte antigen E (HLA-E) trimer comprising a B2M signal peptide fused to an HLA-G peptide fused to the B2M membrane protein fused to the HLA-E protein without its signal peptide;
wherein the B2M gene locus is cleaved at the target site and, through a process of homologous recombination, the nucleic acid of (c) is utilized as a template for inserting the nucleotide sequence encoding the tolerogenic factor into the B2M gene locus, thereby disrupting the B2M gene and generating a genetically modified cell, wherein the genetically modified cell expresses the tolerogenic factor and has disrupted expression of B2M,
wherein the nucleotide sequence encoding PD-L1 comprises SEQ ID NO: 17.
2. The in vitro method of claim 1 , wherein the nucleotide sequence encoding the HLA-E trimer comprises SEQ ID NO: 21, SEQ ID NO: 22, SEQ ID NO: 23, SEQ ID NO: 24, SEQ ID NO: 25, and SEQ ID NO: 26.
3. The in vitro method of claim 1 , wherein the nucleotide sequence encoding the tolerogenic factor is operably linked to an exogenous promoter.
4. The in vitro method of claim 3 , wherein the exogenous promoter is a CAG/CAGGS promoter, a CMV promoter, an EF1α promoter, a PGK promoter, or an UBC promoter.
5. The in vitro method of claim 1 , wherein the RNA-guided nuclease is a Cas9 nuclease.
6. The in vitro method of claim 1 , wherein the RNA-guided nuclease is linked to at least one nuclear localization signal (NLS) located at or within 50 amino acids of the amino-terminus and/or at least one NLS at or within 50 amino acids of the carboxy-terminus.
7. The in vitro method of claim 1 , wherein the guide RNA comprises a spacer sequence comprising an RNA sequence corresponding to a sequence of SEQ ID NO: 1, SEQ ID NO: 2, or SEQ ID NO: 3.
8. The in vitro method of claim 1 , wherein the RNA-guided nuclease and the guide RNA are present at a molar ratio of about 1:3.
9. The in vitro method of claim 1 , wherein the nucleotide sequence of (c) (i) comprises SEQ ID NO: 13.
10. The in vitro method of claim 1 , wherein the nucleotide sequence of (c) (iii) comprises SEQ ID NO: 19.
11. The in vitro method of claim 1 , wherein the nucleic acid of (c) is delivered to the cell via a plasmid vector.
12. The in vitro method of claim 11 , wherein the plasmid vector comprises a nucleotide sequence of SEQ ID NO: 34 or SEQ ID NO: 33.
13. The in vitro method of claim 1 , wherein the disrupted expression of B2M comprises reduced or eliminated expression of B2M.
14. The in vitro method of claim 1 , wherein the genetically modified cell is a stem cell.
15. The in vitro method of claim 14 , wherein the stem cell is a human stem cell, an embryonic stem cell, an adult stem cell, an induced pluripotent stem cell, or a hematopoietic stem and progenitor cell.
16. The in vitro method of claim 14 , wherein the stem cell is capable of being differentiated into mesenchymal progenitor cells, hypoimmunogenic cardiomyocytes, muscle progenitor cells, blast cells, endothelial cells, macrophages, hepatocytes, pancreatic beta cells, pancreatic endoderm progenitors, pancreatic endocrine progenitors, or neural progenitor cells.
17. The in vitro method of claim 1 , wherein the genetically modified cell is a somatic cell.
18. The in vitro method of claim 17 , wherein the somatic cell is an endocrine secretory epithelial cell, an exocrine secretory epithelial cell, a hormone-secreting cell, a keratinizing epithelial cell, a wet stratified barrier epithelial cell, a sensory transducer cell, an autonomic neuron cell, a sense organ and peripheral neuron supporting cell, a central nervous system neuron, a glial cell, a lens cell, an adipocyte, a kidney cell, a barrier function cell, a contractile cell, a blood cell, an immune system cell, a nurse cell, or an interstitial cell.
19. The in vitro method of claim 1 , wherein the genetically modified cell comprises additional genetic modifications.
Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Apr 8, 2025
From: REZANIA, ALIREZA
To: CRISPR THERAPEUTICS AG
Reel/Frame 070776/0328 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Apr 8, 2025
From: RAMOS-ZAYAS, REBECA
To: CRISPR THERAPEUTICS AG
Reel/Frame 070776/0338 →
Continuity (5)
Provisional Application
62728529
· Sep 7, 2018
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