Granted Patent
B2
US 12,584,109 · App. 18/331,092 · Granted Mar 24, 2026
Engineering cell lines capable of proliferation in growth factor free media formulations
Assignee:
Upside Foods, Inc.
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Abstract
Provided herein are methods of engineering a cell line for reduced dependence on exogenous growth factor(s). In some embodiments, the method includes introducing into a cell one or more of: a polynucleotide comprising a coding sequence of a growth factor ligand; a polynucleotide comprising a coding sequence of a growth factor receptor; or a polynucleotide comprising a coding sequence of an activated downstream growth factor target, and culturing the cells in a cultivation infrastructure.
Claims (36)
1 . A method for culturing an avian cell line in a cell culture media, said method comprising:
(a) seeding an edible cell culture media with an edible, avian cell line arising from cells transduced with
a polynucleotide comprising a single coding sequence encoding a single growth factor receptor or growth factor, which is an FGFR, a PDGFR, an activated FGFR, or an activated PDGFR, or a combination of solely a coding sequence encoding an FGFR or an activated FGFR and a coding sequence encoding an IGF;
wherein the polynucleotide is engineered to express the coding sequence or the combination of coding sequences in the cell line; and
(b) culturing the cell line in the cell culture media substantially free of exogenous growth factors,
wherein the cell line proliferates in the absence of exogenous growth factors over 72 hours of culture to a cell density equivalent to a cell density over 72 hours of culture time of a comparable cell line not comprising the polynucleotide and cultured in the presence of the exogenous growth factors.
2 . The method of claim 1 , wherein the cells are transduced with only the polynucleotide encoding the single growth factor or growth factor receptor.
3 . The method of claim 1 , wherein the coding sequence encodes an FGFR or activated FGFR.
4 . The method of claim 1 , wherein the coding sequence encodes a PDGFR or activated PDGFR.
5 . The method of claim 1 , wherein the polynucleotide comprises the combination of a coding sequence encoding an FGFR or an activated FGFR and a coding sequence encoding IGF.
6 . The method of claim 1 , wherein the activated FGFR is FGFR3 having an N540K modification, a K650E modification, a myrist modification, or some combination thereof.
7 . The method of claim 1 , wherein the cell line is cultured in an absence of serum.
8 . The method of claim 1 , wherein the cell line is capable of proliferating to a cell density double the seeded cell density over 72 hours of culture time without exogenous growth factors.
9 . The method of claim 1 , wherein the cell line is cultured to a cell density of 1 million cells per milliliter or more.
10 . The method of claim 1 , wherein the coding sequence for the IGF encodes a fusion protein comprising the IGF and a signal peptide, wherein the signal peptide is IL2 signal peptide.
11 . The method of claim 1 , wherein the coding sequence encodes an FGFR and is one of FGFR1, FGFR2, FGFR3, or FGFR4.
12 . The method of claim 1 , wherein the cell line is derived from chicken.
13 . The method of claim 1 , wherein the cells of the cell line are myoblasts, myocytes, satellite cells, side population cells, muscle derived stem cells, mesenchymal stem cells, myogenic pericytes, mesoangioblasts, or fibroblasts.
14 . The method of claim 1 , further comprising the step of forming cell line into a cell-based food product suitable for consumption.
15 . A method for culturing an edible, avian cell line in a cell culture media, said method comprising:
(a) seeding an edible cell culture media with an edible, avian cell line arising from cells transduced with
a polynucleotide comprising a combination of solely a coding sequence encoding IGF1 and a coding sequence encoding FGF;
wherein the polynucleotide is engineered to express the coding sequences in the cell line; and
(b) culturing the cell line in the cell culture media substantially free of exogenous growth factors,
wherein the cell line proliferates in the absence of the exogenous growth factors over 72 hours of culture to a cell density equivalent to a cell density over 72 hours of culture time of a comparable cell line not comprising the polynucleotide and cultured in the presence of exogenous IGF1 and FGF.
16 . The method of claim 15 , wherein the cell line is derived from chicken.
17 . The method of claim 15 , wherein the cells of the cell line are myoblasts, myocytes, satellite cells, side population cells, muscle derived stem cells, mesenchymal stem cells, myogenic pericytes, mesoangioblasts, or fibroblasts.
18 . The method of claim 15 , further comprising the step of forming the cell line into a cell-based food product suitable for consumption.
19 . A method for culturing an edible, avian cell line in a cell culture media, said method comprising:
(a) seeding an edible cell culture media with an edible, avian cell line arising from cells transduced with
a polynucleotide comprising a single coding sequence of a single growth factor, which encodes FGF2 or FGF3;
wherein the polynucleotide is engineered to express the coding sequence in the cell line; and
(b) culturing the cell line in the cell culture media substantially free of exogenous growth factors, wherein the cell line is capable of proliferating to a cell density higher than the seeded cell density over 72 hours of culture time of a comparable cell line not comprising the polynucleotide.
20 . The method of claim 19 , wherein the cell line is derived from chicken.
21 . The method of claim 19 , wherein the cells of the cell line are myoblasts, myocytes, satellite cells, side population cells, muscle derived stem cells, mesenchymal stem cells, myogenic pericytes, mesoangioblasts, or fibroblasts.
22 . The method of claim 19 , further comprising the step of forming the cell line into a cell-based food product suitable for consumption.
Assignments (2)
CHANGE OF NAME
Recorded Jun 9, 2026
From: UPSIDE FOODS, INC.
To: THE UPSIDE GROUP INC.
Reel/Frame 075827/0954 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Jul 25, 2023
From: DHADWAR, SUKHDEEP SINGH; SCHUMAKER, RACHEL MICHELE
To: UPSIDE FOODS, INC.
Reel/Frame 064369/0624 →
Continuity (2)
Provisional Application
63349865
· Jun 7, 2022
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