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Related Concept Videos

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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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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The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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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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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Related Experiment Video

Updated: Apr 24, 2026

Stem cell-like Xenopus Embryonic Explants to Study Early Neural Developmental Features In Vitro and In Vivo
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Chipping away at the embryonic stem cell network.

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  • 1Dana Farber Cancer Institute and Children's Hospital Boston, Harvard Medical School, Howard Hughes Medical Institute, Boston, Massachusetts 02115, USA.

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Summary
This summary is machine-generated.

Key transcription factors OCT4, SOX2, and NANOG are crucial for embryonic stem cell (ESC) self-renewal and pluripotency. Genome-wide analysis reveals their frequent co-occupancy at target gene promoters, suggesting complex regulatory networks in human ESCs.

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Area of Science:

  • Stem cell biology
  • Epigenetics
  • Gene regulation

Background:

  • Embryonic stem cells (ESCs) possess self-renewal and pluripotency.
  • Transcription factors OCT4, SOX2, and NANOG are critical for maintaining these properties.

Purpose of the Study:

  • To investigate the genome-wide binding patterns of OCT4, SOX2, and NANOG in human ESCs.
  • To understand the regulatory mechanisms governing pluripotency and self-renewal.

Main Methods:

  • Genome-wide localization analysis (ChIP-chip or similar).
  • Identification of promoter regions targeted by key transcription factors.

Main Results:

  • Frequent co-occupancy of OCT4, SOX2, and NANOG at numerous target gene promoters.
  • Evidence for a complex network of regulatory interactions.

Conclusions:

  • OCT4, SOX2, and NANOG function in a coordinated manner.
  • Autoregulatory and feedforward loops are likely involved in maintaining human ESC pluripotency.