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Embryonic Stem Cells00:58

Embryonic Stem Cells

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Embryonic stem (ES) cells are undifferentiated pluripotent cells, meaning they can produce any cell type in the body. This gives them tremendous potential in science and medicine since they can generate specific cell types for use in research or to replace body cells lost due to damage or disease.
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Embryonic Stem Cells00:57

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Embryonic stem (ES) cells were first discovered in mice in 1981 by Martin Evans. In 1998, James Thomson identified a method to isolate embryonic stem cells from humans. Human embryonic stem cells (hESCs) are obtained from 3-5 day old embryos that remain unused after an in vitro fertilization procedure.
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Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
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Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
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Zygotic Development And Stem Cell Formation01:10

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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Xenotransplantation of Human Stem Cells into the Chicken Embryo
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Reassembling embryos in vitro from component stem cells.

Caroline Kubaczka1,2,3, George Q Daley1,2,3

  • 1Stem Cell Transplantation Program, Division of Pediatric Hematology and Oncology, Boston Children's Hospital and Dana-Farber Cancer Institute, Boston, MA 02115, USA.

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Summary
This summary is machine-generated.

Scientists created a mouse embryo model using stem cells in a 3D scaffold. This breakthrough tool allows studying early mammalian development outside the uterus, potentially impacting human embryo research guidelines.

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Area of Science:

  • Developmental Biology
  • Stem Cell Research
  • Mammalian Embryogenesis

Background:

  • Studying early mammalian development is crucial for understanding embryogenesis and developmental disorders.
  • Current methods often face limitations in replicating the complex in vivo environment.
  • The 14-day rule has historically restricted research on human embryos.

Purpose of the Study:

  • To develop a novel in vitro model for studying early post-implantation mammalian development.
  • To investigate the self-assembly and differentiation of embryonic and extraembryonic stem cells.
  • To provide a tool for exploring key developmental processes outside the uterus.

Main Methods:

  • Combining pluripotent embryonic stem cells with multipotent trophoblast stem cells.
  • Utilizing a 3D scaffold to facilitate cell aggregation and organization.
  • Culturing the reconstructed structures to observe developmental progression.

Main Results:

  • Successful reconstruction of mouse embryos exhibiting key developmental features.
  • Demonstration of the model's capacity to mimic early embryonic development.
  • Validation of the 3D scaffold approach for guided stem cell self-organization.

Conclusions:

  • The developed model offers a powerful new tool for investigating early mammalian development.
  • This research may necessitate a re-evaluation of ethical guidelines, such as the 14-day rule, for human embryo research.
  • The findings open avenues for understanding developmental origins of disease and improving reproductive technologies.