IP Library › Granted Patent US 12,492,372
Granted Patent B2
US 12,492,372 · App. 17/534,594 · Granted Dec 9, 2025

Induced stem cells

Inventors: Jose Polo (Clayton, AU); Xiaodong Liu (Clayton, AU); Jia Ping Tan (Clayton, AU)
Assignee: Monash University
C12N5/0606C12N5/0696C12N2501/11C12N2501/155C12N2501/16C12N2506/02C12N2510/02
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Quick Facts
Patent No.
US 12,492,372
App. No.
17/534,594
Granted
Dec 9, 2025
Kind
B2
Abstract

The present invention relates to stem cells derived from a multi-layered cellular structure or blastocyst structure, compositions comprising the same, and methods for obtaining the same.

Claims (43)

1 . A human primed pluripotent stem cell (pPSC) or a cell exhibiting at least one characteristic of a pPSC, wherein the pPSC or cell exhibiting at least one characteristic of a pPSC is produced or isolated from a blastocyst-like structure, wherein the at least one characteristic of a pPSC is selected from:

an absence of the markers characterising a somatic cell;

expression of one or more mRNAs of epiblast specific transcription factors;

expression of one or more of: SFP, OTX2, ZIC2, ZIC3, ZIC5, DNMT3B, KDR, CDH2, CER1, COL2A1, DAZL, TCF7L1, SOX11, SALL2, SOX2, NANOG, KLF4, EPCAM, PRDM14, SSEA-3, SSEA-4, TRA-1-60, TRA-1-81, TRA-2-49/6E, ALP, E-cadherin, UTF-1, OCT4 (POU5F1) and REX1; or

the cell does not express one or more of the markers: ANPEP, TWIST2, KLF17, KRT7, ITGA2.

2 . A method of producing a human primed pluripotent stem cell (pPSC) or a cell exhibiting at least one characteristic of a pPSC, the method comprising;

culturing single cells dissociated from a blastocyst-like structure on a vitronectin layer in the presence of a culture medium for promoting cells to a pluripotent state,

wherein the blastocyst-like structure is obtained by a method of aggregating reprogramming intermediates or a method of assembly of iPSCs and iTSCs,

and wherein the at least one characteristic of a pPSC is selected from:

an absence of the markers characterising a somatic cell;

expression of one or more mRNAs of epiblast specific transcription factors;

expression of one or more of: SFP, OTX2, ZIC2, ZIC3, ZIC5, DNMT3B, KDR, CDH2, CER1, COL2A1, DAZL, TCF7L1, SOX11, SALL2, SOX2, NANOG, KLF4, EPCAM, PRDM14, SSEA-3, SSEA-4, TRA-1-60, TRA-1-81, TRA-2-49/6E, ALP, E-cadherin, UTF-1, OCT4 (POU5F1) and REX1; or

the cell does not express one or more of the markers: ANPEP, TWIST2, KLF17, KRT7, ITGA2,

thereby producing the pPSC or a cell exhibiting at least one characteristic of the pPSC.

3 . The method of claim 2 , further comprising;

dissociating the blastocyst-like structure into single cells, and

culturing those single cells on a vitronectin layer in the presence of a culture medium for promoting cells to a primed pluripotent state,

thereby producing a pPSC or a cell exhibiting at least one characteristic of a pPSC.

4 . An isolated pPSC or a cell exhibiting at least one characteristic of a pPSC, produced or isolated from a blastocyst-like structure, obtainable, or obtained by the method of claim 2 .

5 . The method of claim 2 , further comprising the step of expanding the pPSCs or cells exhibiting at least one characteristic of a pPSC to increase the number of pPSCs.

6 . The method of claim 2 , further comprising the step of differentiating the pPSC, or cell having at least one characteristic of a pPSC, for a sufficient time and under conditions for generating a cell that is not in a pluripotent state.

7 . A differentiated cell produced by the method of claim 6 .

8 . The method of claim 2 , wherein the single cells are cultured for a period of at least 1 day.

9 . The method of claim 2 , wherein the cell retains its undifferentiated state when maintained in subculture.

10 . The method of claim 2 , wherein the cell retains its undifferentiated state when maintained in subculture for at least 5 or more cell culture passages.

11 . The method of claim 3 , wherein the step of dissociating the cells comprises contacting the cells with an enzyme or enzyme composition.

12 . The isolated pPSC or a cell exhibiting at least one characteristic of a pPSC of claim 1 , wherein the pPSC or cell exhibiting at least one characteristic of a pPSC is obtained from a blastocyst-like structure comprising a trophectoderm-like tissue that surrounds a blastocoel and an inner cell mass-like tissue.

13 . The isolated pPSC or a cell exhibiting at least one characteristic of a pPSC of claim 1 , wherein the pPSC or cell exhibiting at least one characteristic of a pPSC is obtained from a blastocyst-like structure that is an in vitro derived blastocyst-like structure exhibiting the main morphological features of a human blastocyst.

14 . The isolated pPSC or a cell exhibiting at least one characteristic of claim 13 , wherein the blastocyst-like structure comprises an inner cell layer and an outer cell layer, the inner cell layer comprising cells exhibiting one or more characteristics of cells of the epiblast or the primitive endoderm lineage, and the outer cell layer comprising cells that exhibit one or more characteristics of the trophectoderm.

15 . The isolated pPSC or a cell exhibiting at least one characteristic of a pPSC of claim 13 , wherein the blastocyst-like structure comprises an inner cell layer and an outer cell layer, the inner cell layer comprising cells that exhibit one or more characteristics of a cell of the epiblast or the primitive endoderm lineage, and the outer cell layer comprises cells that exhibit one or more characteristics of a cell of the trophectoderm, and wherein:

the one or more characteristics of an epiblast cell is present in any one or more of the markers NANOG, OCT4 (also known as POU5F1) or SOX2

the one or more characteristics of an epiblast cell is the morphology of a rounded columnar appearance;

the one or more characteristics of a trophectoderm cell is present in one or more of the markers CDX2 and GATA2s;

the one or more characteristics of a trophectoderm cell is a flattened or elongated epithelial morphology; or

the one or more characteristics or a primitive endoderm lineage is the presence of the marker SOX17 or GATA6.

16 . The isolated pPSC or a cell exhibiting at least one characteristic of a pPSC of claim 13 , wherein the blastocyst-like structure comprises GATA6 positive cells adjacent to OCT4 cells.

17 . The isolated pPSC or a cell exhibiting at least one characteristic of a pPSC of claim 13 , wherein the main morphological features of a human blastocyst comprise:

a spherical or predominantly spherical layered cell aggregate or structure comprising at least two radially positioned layers, and comprising an inner cell layer and an outer cell layer with a fluid-filled cavity, called the blastocoel,

a diameter of approximately 0.1-0.2 mm,

about 200-300 cells within the structure,

wherein the inner layer comprises cells that exhibit one or more characteristics of the cell of the epiblast or the primitive endoderm lineage, and

wherein the outer layer comprises cells that exhibit one or more characteristics of a cell of the trophectoderm.

18 . The isolated pPSC or a cell exhibiting at least one characteristic of a pPSC of claim 13 , wherein the blastocyst-like structure does not form or comprise a zona pellucida.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 10, 2023
From: POLO, JOSE; LIU, XIAODONG; TAN, JIA PING
To: MONASH UNIVERSITY
Reel/Frame 062659/0073 →
Priority Claims (3)
AU 2020904340 · Nov 24, 2020 · national
AU 2021900686 · Mar 10, 2021 · national
AU 2021903429 · Oct 26, 2021 · national
Continuity (1)
Related Publication 20220162550A1 · May 26, 2022
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