Oocyte subsequent derivation of stem cells from cloned human embryos. Medical search. Frequent questions

They showed that opposing gradients of bone morphogenetic protein (BMP) and Nodal, two transforming growth factor family members that act as morphogens, are sufficient to induce molecular and cellular mechanisms required to organize, in vivo or in vitro, uncommitted cells of the zebrafish blastula animal pole into a well-developed embryo. (wikipedia.org)
They form characteristic cell clusters in suspension culture that express a set of genes associated with pluripotency and can differentiate into endodermal, ectodermal and mesodermal cells both in vitro and in vivo. (wikipedia.org)
… "human clone" means an embryo that, as a result of the manipulation of human reproductive material or an in vitro embryo, contains a diploid set of chromosomes obtained from a single - living or deceased - human being, fetus, or embryo. (hinxtongroup.org)
In vitro studies indicate that Dab2 establishes epithelial cell polarity and organization by directing endocytic trafficking of membrane glycoproteins. (biomedcentral.com)
In vitro fertilized (IVF) embryos were cultured in the presence of dimethyl sulfoxide or inhibitors of MAP2K (0.4 μM PD0325901) and GSK3 (3 μM CHIR99021) from the zygote (Day 1) stage. (bioone.org)
We discuss what is known about the distinct metabolic states captured in vitro by the 2-cell-like, naïve, blastocyst-like, formative, and primed states of pluripotency. (conditionmed.org)
2019). Akin to the dynamic nutrient requirements of the developing embryo, discrete in vitro cell states have distinct metabolic profiles (Zhou et al. (conditionmed.org)
It is only through understanding embryonic metabolism and development that we can derive and maintain different in vitro stem cell states for disease modeling and therapies. (conditionmed.org)

Induced stem cells (iSC) are stem cells derived from somatic, reproductive, pluripotent or other cell types by deliberate epigenetic reprogramming. (wikipedia.org)
They are classified as either totipotent (iTC), pluripotent (iPSC) or progenitor (multipotent - iMSC, also called an induced multipotent progenitor cell - iMPC) or unipotent - (iUSC) according to their developmental potential and degree of dedifferentiation. (wikipedia.org)
The researchers were able to identify the minimal conditions and factors that would be sufficient for starting the cascade of molecular and cellular processes to instruct pluripotent cells to organize the embryo. (wikipedia.org)
Transplantation of a human induced pluripotent stem cell-derived airway epithelial cell sheet into the middle ear of rats. (kyoto-u.ac.jp)
In mouse, only epiblast cells can be directly converted into cultured pluripotent embryonic stem cells, capable of forming all adult cell types. (bioone.org)
The developing embryo, from which pluripotent stem cells originate, undergoes a series of dynamic metabolic transitions synchronized to its molecular development. (conditionmed.org)

Mechanochemical Principles of Spatial and Temporal Patterns in Cells and Tissues. (mpi-cbg.de)
Patterns are ubiquitous in living systems and underlie the dynamic organization of cells, tissues, and embryos. (mpi-cbg.de)
However, the mice were grossly normal when dab2 deletion was restricted to the embryo proper and the gene was retained in extraembryonic tissues using Meox2-Cre and Sox2-Cre. (biomedcentral.com)
The fertilized oocyte is totipotent, with resultant blastomeres capable of generating all three primary germ layers, ectoderm, mesoderm, and endoderm, in addition to the extra embryonic tissues. (conditionmed.org)
Therefore, we propose that damage to and subsequent release of mtDNA elicits a protective signalling response that enhances nDNA repair in cells and tissues, suggesting that mtDNA is a genotoxic stress sentinel. (regenerativemedicine.net)

In fact, low levels of telomerase activity have been found in human adult stem cells including haematopoietic and non-haematopoietic stem cells such as neuronal, skin, intestinal crypt, mammary epithelial, pancreas, adrenal cortex, kidney, and mesenchymal stem cells (MSCs) ( Table 1 ). (nature.com)
Intravenous infusion of bone marrow-derived mesenchymal stem cells improves tissue perfusion in a rat hindlimb ischemia model. (kyoto-u.ac.jp)
Possible role of intravenous administration of mesenchymal stem cells to alleviate interstitial cystitis/bladder pain syndrome in a Toll-like receptor-7 agonist-induced experimental animal model in rat. (kyoto-u.ac.jp)

In this regard, emerging technologies of chimeric human organ production via blastocyst complementation (BC) holds great promise. (frontiersin.org)
Collected MII oocytes were vitrified and divided into four groups: untreated, 10 mM caffeine (CA), 10 μM MG132 (MG), and 10 mM caffeine +10 μM MG132 (CA+MG). After warming, the MPF activity of oocytes and their blastocyst formation and implantation rates in the CA, MG, and CA+MG groups were much higher than those in the untreated group. (molcells.org)
Analysis of the effectiveness of caffeine and MG132 for improving somatic cell nuclear transfer (SCNT) technology using cryopreserved eggs showed that supplementation did not improve the blastocyst formation rate of cloned mouse eggs. (molcells.org)
Compared to vehicle controls, 2i conditions increased the abundance of cumulus cells in bovine IVF cultures, which compromised blastocyst formation. (bioone.org)
Following cumulus removal, 2i accelerated blastocyst development and increased inner cell mass (ICM) and trophoblast cell numbers by 30% and 27%, respectively. (bioone.org)
In the mouse, a transporting epithelium is established around the 8-16-cell stage through a process known as compaction where cell definition is lost and the outer cells of the embryo form tight junctions, giving rise to the blastocyst. (conditionmed.org)
The blastocyst comprises the inner cell mass (ICM), which gives rise to the three primary germ layers and consequently the fetus, and the trophectoderm (TE), which gives rise to the extraembryonic and placental tissue. (conditionmed.org)

Differentiated airway epithelial cells can revert into stable and functional stem cells in vivo. (wikipedia.org)

Induced totipotent cells can be obtained by reprogramming somatic cells with somatic-cell nuclear transfer (SCNT). (wikipedia.org)
In somatic cells, the activity of telomerase, a reverse transcriptase that can elongate telomeric repeats, is usually diminished after birth so that the telomere length is gradually shortened with cell divisions, and triggers cellular senescence. (nature.com)
Thus, even in stem cells, except for embryonal stem cells and cancer stem cells, telomere shortening occurs during replicative ageing, possibly at a slower rate than that in normal somatic cells. (nature.com)
Telomeric DNA consists of short guanine-rich repeat sequences in all eukaryotes with linear chromosomes, and its length in human somatic cells is remarkably heterogeneous among individuals ranging from 5 to 20 kb, according to age, organ, and the proliferative history of each cell ( Wright and Shay, 2005 ). (nature.com)
In most human somatic cells except for stem cells and lymphocytes, telomerase activity is diminished after birth so that telomere length shortens with each cell division. (nature.com)

To take human organ generation via BC and transplantation to the next step, we reviewed current emerging organ generation technologies and the associated efficiency of chimera formation in human cells from the standpoint of developmental biology. (frontiersin.org)
A comparative study of mesenchymal stem cell transplantation and NTG-101 molecular therapy to treat degenerative disc disease. (kyoto-u.ac.jp)
The Rosa26-targeted GS cells differentiated into fertility-competent sperm following transplantation. (cyberleninka.org)
On the other hand, Stra8-targeted GS cells showed defective spermatogenesis following transplantation, confirming its prime role in the initiation of meiosis. (cyberleninka.org)

Depending on the species, DAZL is expressed in primordial germ cells (PGCs) and/or pre-meiotic and meiotic germ cells of both sexes. (ijbs.com)

Tudor-related proteins TDRD1/MTR-1, TDRD6 and TDRD7/TRAP: domain composition, intracellular localization, and function in male germ cells in mice. (shengsci.com)

Small-molecule inhibitor cocktail promotes the proliferation of pre-existing liver progenitor cells. (kyoto-u.ac.jp)

Up to the 2-cell embryo, blastomeres remain totipotent (Garner and McLaren, 1974). (conditionmed.org)

Nat Rev Mol Cell Biol , Art. (mpi-cbg.de)

Thus, intrinsic factors governing the developmental potential that diminish during oocyte cryopreservation should be explored. (molcells.org)
Another drawback of oocyte vitrification is diminished developmental potential because of the decreased quality of embryos after warming. (molcells.org)

However, the cell numbers in blastocysts did not differ among groups. (molcells.org)

In Drosophila imaginal discs, cells have to choose from a limited number of standard discrete differentiation states. (wikipedia.org)
Acquisition of limb-forming ability by discrete regions of the lateral plate of the chick embryo is thought to depend on a signaling cascade moving sequentially from the area of Hensen's node to the somitic mesoderm, the intermediate mesoderm, and then to the prospective limb-forming regions of the lateral plate (Step. (shengsci.com)

In 1924 Hans Spemann and Hilde Mangold demonstrated the key importance of cell-cell inductions during animal development. (wikipedia.org)
… "embryo" means a human organism during the first 56 days of its development following fertilization or creation, excluding any time during which its development has been suspended, and includes any cell derived from such an organism that is used for the purpose of creating a human being. (hinxtongroup.org)
However, robust and large-scale genome-wide reprogramming of DNA methylome occurs during two critical developmental processes: (1) development of primordial germ cells and (2) pre-implantation embryogenesis. (nature.com)
We therefore decided to investigate comprehensively the global and high-resolution DNA methylation dynamics during early development of a non-human primate (rhesus monkey, Macaca mulatta ). (nature.com)
Monkeys have served as one of the most valuable models for understanding DNA methylation dynamics during early embryogenesis in human due to their similarities in genetics and early embryonic development 17 , 18 . (nature.com)
Furthermore, due to ethical and legal concerns, very limited techniques can be applied to human embryos to validate some of significant conclusions drawn from descriptive studies regarding human embryonic development. (nature.com)
The study of the new dab2 mutant allele in embryos and embryoid bodies confirms a role for Dab2 in extraembryonic endoderm development and epithelial organization. (biomedcentral.com)
Conditional deletion indicates that Dab2 is dispensable for organ development, when the vast majority of the embryonic cells are dab2 null. (biomedcentral.com)
Here, we consider the metabolism of the early embryo through development, and look at the nutrient milieu within the developing stem cell niche. (conditionmed.org)
2020). This places metabolism at the forefront of development and cell state decisions. (conditionmed.org)
These data provide insight into epigenetic errors that may be associated with the poor development of embryos generated from immature spermatozoa. (shengsci.com)
In studies initially focused on roles of nonmuscle myosin IIA (NMIIA) in the developing mouse epidermis, we have discovered that a previously described cytokeratin 5 (K5)-Cre gene construct is expressed in early embryo development. (shengsci.com)

Recently, the importance of telomere maintenance in human stem cells has been highlighted by studies on dyskeratosis congenital, which is a genetic disorder in the human telomerase component. (nature.com)
In Enhancing Evolution, leading bioethicist John Harris dismantles objections to genetic engineering, stem-cell research, designer babies, and cloning and makes an ethical case for biotechnology that is both forthright and rigorous. (philpapers.org)
Human enhancement, Harris argues, is a good thing--good morally, good for individuals, good as social policy, and good for a genetic heritage that needs serious improvement. (philpapers.org)
TALEN and CRISPR/Cas9, when applied in GS cells, will be valuable tools in the study of spermatogenesis and for revealing the genetic mechanism of spermatogenic failure. (cyberleninka.org)
2004). In order to make GS cells more widely applicable for the study of spermatogenesis at the genetic and molecular levels, it is desirable to be able to modify their genome without disturbing their spermato-genic ability. (cyberleninka.org)

Promoters of genes associated with oxidative phosphorylation are preferentially remethylated at the 8-cell stage, suggesting that this mode of energy metabolism may not be favored. (nature.com)
Positional cloning of rat mutant genes reveals new functions of these genes. (kyoto-u.ac.jp)
Mapping all miRNAs to the tammar genome and comparing target genes among tammar, mouse and human, we identified 163 conserved target genes. (biomedcentral.com)
An additional nine genes were identified in tammar that do not have an orthologous miRNA target in human and likely represent novel miRNA-regulated genes in the tammar. (biomedcentral.com)
DAZ (Deleted in Azoospermia) family genes are important fertility factors in many animals including humans. (ijbs.com)
In human, an array of four DAZ genes ( DAZ 1-4) is located in two clusters on the Y chromosome and mutations of these genes cause severe oligospermia or azospermia [ 1 ]. (ijbs.com)
In the present study, we tested TALEN and double-nicking CRISPR/Cas9 on GS cells, targeting Rosa26 and Stra8 loci as representative genes dispensable and indispensable in spermatogenesis, respectively. (cyberleninka.org)
In fact, this was shown to be possible by the transfection of genes into GS cells (Kanatsu-Shinohara et al. (cyberleninka.org)

Cliff and Dalton, 2017), with nutrients capable of inducing and maintaining alternate cell states (Shyh-Chang et al. (conditionmed.org)

Although the genome-wide DNA demethylation is believed to be a hallmark of mammalian embryogenesis, previous study also indicated that the somatic form of dnmt1 ( dnmt1s ) is actually expressed at each stage of pre-implantation embryos and plays a role in the maintenance of DNA imprinting 8 . (nature.com)
Cryopreservation of mammalian oocytes has been successfully applied for long-term storage of surplus eggs in mammalian assisted reproductive technology (ART), including in humans. (molcells.org)
Spermatogonial stem cells (SSCs) are pivotal for maintaining the lifelong sperm production of mammalian males. (cyberleninka.org)

Telomerase can add telomeric repeats onto the chromosome ends, and prevents the replication-dependent loss of telomere and cellular senescence in highly proliferative cells of the germline and in the majority of cancers ( Blasco, 2005 ). (nature.com)
Although the cultured SSCs, named germline stem (GS) cells, are targets of genome modification, this process remains technically difficult. (cyberleninka.org)
The cultured SSCs, named germline stem (GS) cells, are now useful in research on various aspects of spermatogenesis. (cyberleninka.org)

Some types of mature, specialized adult cells can naturally revert to stem cells. (wikipedia.org)

The regulation of telomere length and telomerase activity is a complex and dynamic process that is tightly linked to cell cycle regulation in human stem cells. (nature.com)

DAZ family proteins are found almost exclusively in germ cells in distant animal species. (ijbs.com)
DAZ family proteins are located in the nucleus and/or in the cytoplasm of male and female germ cells at different developmental stages throughout the gametogenesis. (ijbs.com)
Dazl can regulate the expression, transport and localization of target mRNAs of proteins which control the differentiation, growth and maturation of germ cells. (ijbs.com)
In mice, nuage that is prominent in postnatal male germ cells is also called intermitochondrial cement or chromatoid bodies. (shengsci.com)

After injury, mature terminally differentiated kidney cells dedifferentiate into more primordial versions of themselves and then differentiate into the cell types needing replacement in the damaged tissue Macrophages can self-renew by local proliferation of mature differentiated cells. (wikipedia.org)

Basically, given the difference of telomere and telomerase activity in human and mouse cells, the telomere and telomerase status in stem cell populations is different between humans and mice ( Harrington, 2004 ). (nature.com)

Deletion of DAZ gene is the most common causes of infertility in humans. (ijbs.com)

Maintaining the thyroid gland in mutant thyroglobulin-induced hypothyroidism requires thyroid cell proliferation that must continue in adulthood. (kyoto-u.ac.jp)
The constitutive dab2 deleted embryos showed a spectrum in the degree of endoderm disorganization in E5.5 and no mutant embryos persisted at E9.5. (biomedcentral.com)

In newts, muscle tissue is regenerated from specialized muscle cells that dedifferentiate and forget the type of cell they had been. (wikipedia.org)
XI - embryonic stem cells: embryonic cells that are capable of modifying the cells of any organism tissue. (hinxtongroup.org)
International bi-monthly journal of cell signaling, tissue protection, and translational research. (conditionmed.org)

Here we report genome-wide composition, patterning, and stage-specific dynamics of DNA methylation in pre-implantation rhesus monkey embryos as well as male and female gametes studied using an optimized tagmentation-based whole-genome bisulfite sequencing method. (nature.com)
Genomes from elongated spermatids exhibited an intermediate level of DNA methylation, between those of round spermatids and mature spermatozoa, suggesting that the male germ cell acquires the ability to maintain its undermethylated state in the paternal zygotic genome during this phase of spermiogenesis. (shengsci.com)

hESCs can be generated by SCNT using dermal fibroblasts nuclei from both a middle-aged 35-year-old male and an elderly, 75-year-old male, suggesting that age-associated changes are not necessarily an impediment to SCNT-based nuclear reprogramming of human cells. (wikipedia.org)

Summary Mouse spermatogonial stem cells (SSCs) can be cultured for multiplication and maintained for long periods while preserving their spermatogenic ability. (cyberleninka.org)
In addition, mtDNA stress in TFAM-deficient mouse melanoma cells produces tumours that are more resistant to doxorubicin in vivo. (regenerativemedicine.net)

We explore the recently described metabolic surge event that occurs as pluripotency is lost and stem cells commit to differentiate. (conditionmed.org)

One example is the transformation of iris cells to lens cells in the process of maturation and transformation of retinal pigment epithelium cells into the neural retina during regeneration in adult newt eyes. (wikipedia.org)
The fact that transdetermination (change of the path of differentiation) often occurs for a group of cells rather than single cells shows that it is induced rather than part of maturation. (wikipedia.org)
Levels of maturation-promoting factor (MPF) in oocytes decline after vitrification, and this decline has been suggested as one of the main causes of low developmental competence resulting from cryoinjury. (molcells.org)

Keratin 5-Cre-driven excision of nonmuscle myosin IIA in early embryo trophectoderm leads to placenta defects and embryonic lethality. (shengsci.com)

An examination of chromosome cycles showed that the AB-cell entered M-phase 5 min later and spent about 35 min. (shengsci.com)

The germ-line cells of many animals possess a characteristic cytoplasmic structure termed nuage or germinal granules. (shengsci.com)

On the other hand, a chimera is defined as an organism in which cells from two or more different organisms have contributed. (frontiersin.org)

A critical length of telomere repeats is required to ensure proper telomere function and avoid the activation of DNA damage pathways that result in replicative senescence or cell death. (nature.com)

However, though BC is emerging as a potential organ transplant option, challenges regarding organ size scalability, immune system incompatibilities, long-term maintenance, potential evolutionary distance, or unveiled mechanisms between donor and host cells remain. (frontiersin.org)
In this review, we summarize the history of interspecies chimerism in various animal models to find hints for BC application and describe the challenges and prospects of utilizing BC for human organ generation. (frontiersin.org)

Progenitors are obtained by so-called direct reprogramming or directed differentiation and are also called induced somatic stem cells. (wikipedia.org)
This meant that the cells can change their differentiation pathway. (wikipedia.org)
To establish protocols for the safe and efficient differentiation of healthy cells for therapies, we must develop a better understanding of the dynamic continuum of metabolic states that span pluripotency and differentiation, and how to influence them. (conditionmed.org)

Here we review the role of telomeres and telomerase in the function and capacity of the human stem cells. (nature.com)
Modulation of LDL receptor endocytosis by Dab2 has also been studied in cultured cells [ 36 ], though a role in vivo has not yet been established. (biomedcentral.com)

By the 8-cell stage, remethylation becomes more pronounced than demethylation, resulting in an increase in global DNA methylation. (nature.com)

This process allows the body to replace cells not suitable to new conditions with more suitable new cells. (wikipedia.org)
The process involves sucking out the nucleus of a somatic (body) cell and injecting it into an oocyte that has had its nucleus removed Using an approach based on the protocol outlined by Tachibana et al. (wikipedia.org)

Cleavage asynchrony in the Tubifex embryo: involvement of cytoplasmic and nucleus-associated factors. (shengsci.com)

Anatomy59

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