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Reproduction of reset cell

ABSTRACT: Functional-assay limitations are an emerging issue in characterizing human pluripotent stem cells (hPSCs). With rodent PSCs, chimera formation, using pre-implantation embryos, is the gold-standard assay of pluripotency. In hPSCs, this can only be monitored via teratoma formation or in vitro differentiation, as ethical concerns preclude generation of human-animal chimera. To circumvent this issue, we established a functional assay utilizing interspecific blastocyst injection and in vitro culture (interspecies in vitro chimera assay). The assay uses mouse pre-implantation embryos and human PSCs to make interspecies chimeras cultured in vitro to the early egg cylinder stage. When hiPSCs, both conventional and naive type, which called “reset cell”, were injected into mouse embryos and cultured. The cells were never integrated into the epiblast of egg cylinder stage-embryo. These results suggest that hPSCs, including naïve type, are unable to form chimera with mouse embryo.

ORGANISM(S): Homo sapiens

PROVIDER: GSE66657 | GEO | 2015/03/10

SECONDARY ACCESSION(S): PRJNA277636

REPOSITORIES: GEO

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Reproduction of reset cell

Project description:Functional-assay limitations are an emerging issue in characterizing human pluripotent stem cells (hPSCs). With rodent PSCs, chimera formation, using pre-implantation embryos, is the gold-standard assay of pluripotency. In hPSCs, this can only be monitored via teratoma formation or in vitro differentiation, as ethical concerns preclude generation of human-animal chimera. To circumvent this issue, we established a functional assay utilizing interspecific blastocyst injection and in vitro culture (interspecies in vitro chimera assay). The assay uses mouse pre-implantation embryos and human PSCs to make interspecies chimeras cultured in vitro to the early egg cylinder stage. When hiPSCs, both conventional and naive type, which called M-bM-^@M-^\reset cellM-bM-^@M-^], were injected into mouse embryos and cultured. The cells were never integrated into the epiblast of egg cylinder stage-embryo. These results suggest that hPSCs, including naM-CM-/ve type, are unable to form chimera with mouse embryo. Reset cells were converted from conventional human iPSC line PB004, and then compared their gene expression profile with or without transgene overexpression induced by doxycyclin treatment.

2015-03-10 | E-GEOD-66657 | biostudies-arrayexpress

Chimeric contribution of human extended pluripotent stem cells to monkey embryos

Project description:Pluripotent stem cells (PSCs) represent the earliest stages of organismal development, and have the potential to differentiate into cell types from all three primary germ layers. To date, however, chimeric competency of human EPS cells has not been determined in other animal hosts. Leveraging on a recently developed in vitro culture system that enabled the development of monkey embryos up to 20 days in vitro, in this study, we injected human PSCs (hPSCs) cells into cynomolgus monkeys (Macaca fascicularis) morula embryos and examined their contribution to different lineages at different timepoints during in vitro culture.

2021-04-15 | GSE155381 | GEO

Derivation of formative-like pluripotent stem cells from mammalian embryos [RNA-Seq]

Project description:Two phases of pluripotency, naïve and primed, have been captured in vitro and studied in details1. A third formative phase was recently proposed to exist between naïve and primed phases2. Formative pluripotency entails permissiveness for direct primordial germ cell (PGC) induction and competence for blastocyst chimeras, and is characterized by transcriptional and epigenetic features intermediate of naïve and primed pluripotency. To date, however, stable pluripotent stem cells (PSCs) harboring formative features haven’t been derived from early mammalian embryos. Here we develop a method which enabled the derivation and culture of stable formative-like embryonic stem cells (ESCs) from mouse blastocysts. Formative-like mouse ESCs share molecular features characteristic of early post-implantation epiblasts and are competent for PGC-like cell induction and blastocyst chimera formation. The same culture also supported the derivation of ESCs and transgene-free induced pluripotent stem cells (iPSCs) from horse blastocysts and fibroblasts, respectively. Horse ESCs/iPSCs transcriptionally resembled mouse formative cells, and could also be directly induced into PGC-like cells. Formative-like horse iPSCs could efficiently chimerize horse, mouse, goat, sheep and pig embryos. Stable formative-like PSCs will be invaluable for studying mammalian pluripotency, and our method may be broadly applicable for the derivation of PGC and chimera competent PSCs from other mammalian species.

2020-11-27 | GSE135989 | GEO

Derivation of formative-like pluripotent stem cells from mammalian embryos [ChIP-Seq]

2020-11-27 | GSE135990 | GEO

Podocalyxin-Like Protein 1 Regulates Extended and Primed Pluripotency through the Cholesterol Biosynthesis Pathway

Project description:We utilized scRNA-seq to study the human-mouse chimera transcriptomic regulation at peri-implantation embryo stage. Single-cell RNA sequencing revealed PODXL overexpression boosted chimerism between human cells in mouse host embryos and the potential cell-cell communication interactions in human-mouse chimeras. Potential cell-cell communications were identified to optimize cell-cell contact interaction for reducing the xenogeneic barrier in the interspecies chimeras in future studies.

2022-12-01 | GSE189014 | GEO

Human Naive Pluripotency Attained by Transient Inhibition of Mtor

Project description:The ability to support blastocyst chimera formation is the most critical property of naïve pluripotent stem cells (PSCs). Transient inhibition of mTOR converts human PSCs from primed to naive state. Naïve human PSCs cultured in 2iLI robustly incorporate into mouse embryonic development after injected to mouse blastocysts.

2020-05-13 | GSE125813 | GEO

Ex utero Mouse Embryogenesis from Pre-Gastrulation to Late-Organogenesis

Project description:Establishment of the mammalian body plan occurs shortly after the embryo implants into the maternal uterus, and our understanding of post-implantation developmental processes remains limited. While methods for in vitro culture of pre- and peri-implantation mouse embryos are routinely utilized, approaches for robust culture of post-implantation embryos from egg cylinder stages until advanced organogenesis remain to be established. We develop herein highly stable ex utero post-implantation mouse embryo culture platforms, that enable appropriate development of embryos before gastrulation (E5.5) until the hind limb formation stage (E11). Late gastrulating embryos (E7.5) are grown in 3D rotating bottles settings, while extended culture from pre-gastrulation stages (E5.5 or E6.5) requires a combination of novel static and rotating bottle culture protocols. Histological, molecular, and single cell RNA-seq analysis validate that the ex utero developed embryos recapitulate precisely in utero development. This culture system is amenable to introducing a variety of embryonic perturbations and micro-manipulations that can be followed ex utero for up to 6 days. Establishment of a system to robustly grow normal mouse embryos ex utero from pre-gastrulation to advanced organogenesis represents a valuable tool to investigate post-implantation embryogenesis, eliminating the uterine barrier to mechanistically interrogate morphogenesis and tissue specification in mammals.

2021-02-15 | GSE149372 | GEO

Global gene expression profile of interspecies pregnant implantation sites between rat and mouse

Project description:In present, interspecies cloning and interspecies-pregnancy were studied for endangered species rescue. However, the low implantation and survival ratio, spontaneous abortion, and unknown reason embryos absorption are the common and difficult problems of interspecies-pregnancy. In order to discover the mechanism of interspecies-pregnant failure and find ways to overcome the xeon-pregnant obstacles, we chosen the rat embryos pregnant in mouse uterus as a interspecies-pregnancy model. Three groups were set, mouse embryos to mouse recipients (MM) as control group, rat embryos to mouse recipients (RM), and rat and mouse embryos to mouse recipients together (RMM) as experiment groups. The former studies showed that rat embryos live no longer than day 7 of mouse pregnancy (D7). Our results showed that rat embryos survived to D7, and still existed to day 9 of mouse pregnancy (D9) in RM group. Surprisingly, the rat embryos survived to day 13 of the mouse gestation (D13) in RMM group. Microarray analysis was used to detect the global-gene expression profile changes of the whole implantation sites among the three groups at D7 and D9. By this way, we screened out the genes promoting the implanted rat embryos development in a mouse uterus which helped the rat embryos survive to D13 in RMM group compared with RM group, and the genes hindering the rat embryos development in a mouse uterus which prevented rat embryos living longer than D7 in RM group and D13 in RMM group compared with MM group. These findings provide insights into the mechanism of interspecies pregnant failure and new idea for interspecies pregnant studies. Keywords: time course, pregnancy day

2007-12-01 | GSE4002 | GEO

Turner2015-Human/Mosquito ELP Model

Project description:the growth of the mosquito population is directly related to the spread of malaria, the Four Stage Life Cycle is incorporated to model the effects of climate change and interspecies competition within the mosquito life cycle stages of Egg, Larvae, and Pupae.

2020-03-13 | BIOMD0000000922 | BioModels

Expression data from mouse embryo (E5) cultured in the narrow and wide cavity

Project description:The mouse anterior-posterior (A-P) axis polarization is preceded by formation of the distal visceral endoderm (DVE). However, the mechanism of the emergence of DVE cells is not well understood. Here, we show by in vitro culturing of embryos immediately after implantation in micro-fabricated cavities (narrow; 90 micro-meter, wide; 180 miro-meter in diameter) that the external mechanical cues exerted on the embryo, i.e. cultured in the narrow cavity, are crucial for DVE formation as well as elongated egg cylinder shape. This implies that these developmental events immediately after implantation are not simply embryo-autonomous processes but require extrinsic mechanical factors. Further whole genome-wide gene expression profiles with DNA microarray revealed that no significant difference of transcripts were evident with or without mechanical cues except DVE-related markers. Thus, we propose that external mechanical cues rather than not specific molecular pathways can trigger the establishment of the A-P axis polarization, which is one of the fundamental proccesses of mammalian embryogenesis.

2013-09-27 | GSE51198 | GEO

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