Universal donor cells
Genetically modified cells that are compatible with multiple subjects, e.g., universal donor cells, and methods of generating said genetic modified cells are provided herein. The universal donor cells comprise at least one genetic modification within or near at least one gene that encodes a survival factor, wherein the genetic modification comprises an insertion of a polynucleotide encoding a tolerogenic factor. The universal donor cells may further comprise at least one genetic modification within or near a gene that encodes one or more MHC-I or MHC-II human leukocyte antigens or a component or a transcriptional regulator of a MHC-I or MHC-II complex, wherein said genetic modification comprises an insertion of a polynucleotide encoding a second tolerogenic factor.
1. A genetically modified cell comprising (a) a nucleotide sequence encoding programmed death-ligand 1 (PD-L1) operably linked to an exogenous promoter inserted within a gene encoding beta-2 microglobulin (B2M) and (b) a nucleotide sequence encoding HLA class I histocompatibility antigen, alpha chain E (HLA-E) operably linked to an exogenous promoter inserted within a gene encoding thioredoxin interacting protein (TXNIP), wherein the genetically modified cell expresses PD-L1 and HLA-E and does not express B2M and TXNIP.
2. The genetically modified cell of claim 1 , wherein the nucleotide sequence encoding PD-L1 consists essentially of SEQ ID NO: 11.
3. The genetically modified cell of claim 1 , wherein the nucleotide sequence encoding HLA-E comprises a sequence encoding a HLA-E trimer comprising a B2M signal peptide fused to an HLA-G presentation peptide fused to a B2M membrane protein fused to HLA-E without its signal peptide.
4. The genetically modified cell of claim 3 , wherein the sequence encoding the HLA-E trimer consists essentially of SEQ ID NO: 55.
5. The genetically modified cell of claim 1 , wherein the exogenous promoter is a CAG promoter.
6. The genetically modified cell of claim 1 , wherein the cell is a stem cell.
7. The genetically modified cell of claim 6 , wherein the stem cell is an embryonic stem cell, an adult stem cell, an induced pluripotent stem cell, or a hematopoietic stem cell.
8. The genetically modified cell of claim 1 , wherein the cell is a differentiated cell or a somatic cell.
9. The genetically modified cell of claim 1 , wherein the cell is capable of being differentiated into lineage-restricted progenitor cells or fully differentiated somatic cells.
10. The genetically modified cell of claim 9 , wherein the lineage-restricted progenitor cells are definitive endoderm cells, primitive gut tube cells, posterior foregut cells, pancreatic endoderm progenitors, or pancreatic endocrine progenitors, and the fully differentiated somatic cells are immature beta cells or mature beta cells.
11. A plurality of genetically modified cells according to claim 1 .
12. The plurality of cells of claim 11 , wherein at least about 50% of the cells express PD-L1 and/or at least about 50% of the cells express HLA-E.
13. The plurality of cells of claim 11 , wherein at least about 70% of the cells express PD-L1 and/or at least about 70% of the cells express HLA-E.
14. The plurality of cells of claim 11 , wherein at least about 90% of the cells express PD-L1 and/or at least about 90% of the cells express HLA-E.
15. A population of lineage-restricted progenitor cells or fully differentiated somatic cells derived from the plurality of genetically modified cells of claim 11 .
16. The population of cells of claim 15 , wherein the lineage-restricted progenitor cells are definitive endoderm cells, primitive gut tube cells, posterior foregut cells, pancreatic endoderm progenitors, or pancreatic endocrine progenitors, and the fully differentiated somatic cells are immature beta cells or mature beta cells.
17. The population of cells of claim 15 , wherein at least about 50% of the cells express PD-L1 and/or at least about 50% of the cells express HLA-E.
18. The population of cells of claim 15 , wherein at least about 70% of the cells express PD-L1 and/or at least about 70% of the cells express HLA-E.
19. The population of cells of claim 15 , wherein at least about 90% of the cells express PD-L1 and/or at least about 90% of the cells express HLA-E.