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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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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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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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Stem cell-based embryo models: The 2021 ISSCR stem cell guidelines revisited.

Amander T Clark1, Heidi Cook-Andersen2, Sarah Franklin3

  • 1Department of Molecular Cell and Developmental Biology, Center for Reproductive Science, Health and Education, University of California, Los Angeles, Los Angeles, CA 90095, USA.

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|June 11, 2025
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Summary
This summary is machine-generated.

New guidelines for human stem cell-based embryo models (SCBEMs) emphasize appropriate review, scientific rationale, and limited timelines for research. These updates aim to enhance clarity and public trust in this evolving field.

Keywords:
ISSCR guidelinesembryostem cell-based embryo models

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Area of Science:

  • Developmental Biology
  • Stem Cell Research
  • Biomedical Ethics

Background:

  • Human stem cell-based embryo models (SCBEMs) offer insights into human embryogenesis, reproductive technologies, and disease origins.
  • SCBEMs present unique ethical considerations compared to other stem cell models like organoids.
  • Existing 2021 ISSCR guidelines categorize SCBEM research oversight based on embryonic and extraembryonic lineage involvement.

Purpose of the Study:

  • To re-examine and update existing guidelines for human stem cell-based embryo models (SCBEMs) in light of recent scientific advancements.
  • To provide clearer recommendations for the ethical and scientific oversight of SCBEM research.
  • To ensure continued public confidence in stem cell research involving embryo models.

Main Methods:

  • A working group was convened by the International Society for Stem Cell Research (ISSCR) executive.
  • The group conducted a thorough re-examination of the 2021 ISSCR guidelines.
  • New recommendations were developed based on recent progress in creating complex SCBEMs.

Main Results:

  • Research involving organized 3D human SCBEMs requires appropriate review.
  • All human SCBEM research must possess a clear scientific rationale.
  • Human SCBEM research should be conducted within limited, defined timelines.

Conclusions:

  • The proposed modifications aim to bring clarity to the rapidly advancing field of SCBEMs.
  • These updated guidelines will assist researchers, oversight committees, and stakeholders in navigating SCBEM research.
  • Adherence to revised guidelines is crucial for maintaining scientific integrity and public trust.