Granted Patent B2

US 12,319,925 · App. 18/157,052 · Granted Jun 3, 2025

Inventors: Daniel Getts (Stow, MA); Yuxiao Wang (Belmont, MA); Namita Bisaria (Somerville, MA); Inna Shcherbakova (Holliston, MA); Socheata Ly (North Billerica, MA)

Assignee: MYELOID THERAPEUTICS, INC.

C12N15/85A61K31/713C12N15/90C07K2319/03C07K2319/09C07K2319/30C07K2319/33C12N2310/20C12N2800/80C12N2800/90C12N2830/50C12N2840/203

Abstract

Claims (41)

1. A method of expressing an exogenous human therapeutic polypeptide encoded by an exogenous sequence from a site-specifically integrated genomic DNA sequence of target human cells, the method comprising:

(a) contacting a composition to the target human cells, the composition comprising one or more nanoparticle delivery vehicles encapsulating:

(I) an RNA molecule encoding a Cas nickase,

(II) a first guide RNA or a polynucleic acid encoding the first guide RNA, wherein the first guide RNA specifically targets a sequence upstream of a genomic DNA target site of the target human cells,

(III) a second guide RNA or a polynucleic acid encoding the second guide RNA, wherein the second guide RNA specifically targets a sequence downstream of the genomic DNA target site of the target human cells, and

(IV) one or more RNA molecules,

wherein the one or more RNA molecules comprise a first RNA molecule comprising:

(i) a sequence that is a reverse complement of a DNA sequence that encodes the exogenous human therapeutic polypeptide; and

(ii) a mobile genetic element, wherein the mobile genetic element comprises an RNA sequence encoding a polypeptide with target-primed reverse transcription (TPRT) activity, wherein the polypeptide with TPRT activity comprises an endonuclease domain with a mutation that abrogates endonuclease activity of the endonuclease domain, wherein the polypeptide with TPRT activity comprises a human ORF2p polypeptide having an amino acid sequence with at least 90% sequence identity to the amino acid sequence of SEQ ID NO: 59, and wherein the human ORF2p has a mutation at D205 of SEQ ID NO: 59 that abrogates endonuclease activity of the endonuclease;

wherein the target human cells uptake the one or more nanoparticle delivery vehicles;

(b) translating the RNA sequence encoding the polypeptide with TPRT activity and translating the RNA sequence encoding the Cas nickase;

(c) introducing nicks upstream and downstream of the genomic DNA target site of the target human cells via the Cas nickase translated in (b) guided by the first guide RNA and the second guide RNA;

(d) reverse transcribing the sequence that is the reverse complement of the DNA sequence that encodes the human therapeutic polypeptide via the TPRT activity of the polypeptide with TPRT activity translated in (b), thereby producing a DNA sequence encoding the exogenous human therapeutic polypeptide;

(e) integrating the DNA sequence encoding the exogenous human therapeutic polypeptide produced in step (d) into nicked genomic DNA target site of the target human cells, wherein the nicked genomic DNA target site of the target human cells is a non-ribosomal genomic DNA target site; and

(f) expressing the exogenous human therapeutic polypeptide in the target human cells, wherein the exogenous human therapeutic polypeptide is expressed from the DNA sequence integrated into the genomic DNA of the target human cells in step (e);

wherein the DNA sequence encoding the exogenous human therapeutic polypeptide produced in (d) that is integrated into the genomic DNA target site of the target human cells in (e) is less than 7.5 kb in length.

2. The method of claim 1 , wherein the polypeptide with TPRT activity comprises an amino acid sequence with at least 95% sequence identity to the amino acid sequence of SEQ ID NO: 59.

3. The method of claim 1 , wherein the one or more RNA molecules further comprise a second RNA molecule comprising a sequence encoding a LINE1 ORF1p polypeptide with at least 90% sequence identity to the amino acid sequence of SEQ ID NO: 57.

4. The method of claim 2 , wherein the RNA sequence encoding the polypeptide with TPRT activity comprises a sequence having at least 80% sequence identity to SEQ ID NO: 60.

5. The method of claim 1 , wherein the polypeptide with TPRT activity comprises the amino acid sequence of SEQ ID NO: 59, with the proviso that amino acid D205 of SEQ ID NO: 59 is mutated.

6. The method of claim 1 , wherein the polynucleic acid encoding the first guide RNA and the second guide RNA is a DNA.

7. The method of claim 1 , wherein the Cas nickase is a Cas9 nickase, and wherein each of the first guide RNA and the second guide RNA is fused to a Cas9 nickase.

8. The method of claim 1 , wherein the DNA sequence encoding the exogenous human therapeutic polypeptide produced in (d) that is integrated into the genomic DNA target site of the target human cells in (e) is from 1 kb to 5 kb in length.

9. The method of claim 1 , wherein the target human cells are primary cells.

10. The method of claim 1 , wherein the first RNA molecule comprises a homology arm complementary to a sequence comprising the target site in the genomic DNA.

11. The method of claim 1 , wherein (e) does not comprise integrating the DNA sequence encoding the exogenous human therapeutic polypeptide produced in step (c) into the genomic DNA at a poly T site.

12. The method of claim 5 , wherein the first RNA molecule has a total length of from 3 kb to 20 kb.

13. The method of claim 1 , wherein the exogenous human therapeutic polypeptide is selected from the group consisting of a ligand, an antibody, a receptor, an enzyme, a transport protein, a structural protein, a hormone, a contractile protein, a storage protein and a transcription factor.

14. The method of claim 13 , wherein the exogenous human therapeutic polypeptide is a receptor selected from the group consisting of a chimeric antigen receptor (CAR) and a T cell receptor (TCR).

15. The method of claim 1 , wherein the composition is a pharmaceutical composition formulated for systemic administration to a human subject.

16. The method of claim 5 , wherein the human ORF2p polypeptide is fused to a nuclear localization signal (NLS).

17. The method of claim 1 , wherein the second first RNA molecule lacks a 3′ UTR sequence.

18. The method of claim 1 , wherein the DNA sequence encoding the exogenous human therapeutic polypeptide does not comprise introns.

19. The method of claim 1 , wherein the target human cells are immune cells selected from the group consisting of T cells, B cells, myeloid cells, monocytes, macrophages and dendritic cells.

20. The method of claim 1 , wherein the one or more RNA molecules

(i) is formulated in a nanoparticle selected from the group consisting of a lipid nanoparticle and a polymeric nanoparticle; and/or

(ii) comprise a glycosylated RNA molecule, a circular RNA molecule or a self-replicating RNA molecule.

21. The method of claim 1 , wherein the first RNA molecule comprises:

an RNA sequence encoding human ORF1p with at least 95% sequence identity to the amino acid sequence of SEQ ID NO: 57, and

an RNA sequence encoding a human ORF2p with at least 95% sequence identity to the amino acid sequence of SEQ ID NO: 59 and;

wherein the Cas nickase is a Cas9 nickase.

Assignments (2)

Continuity (5)

References Cited (400)

Cited By (1)

US 12,599,678