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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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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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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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Dissecting human embryonic skeletal stem cell ontogeny by single-cell transcriptomic and functional analyses.

Jian He1, Jing Yan1, Jianfang Wang2

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Researchers identified novel embryonic skeletal stem cells (eSSPCs) in human limb development. These cells are crucial for forming bone and cartilage during early skeletogenesis.

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Skeletal Biology

Background:

  • Human skeletal stem cells (SSCs) are known in fetal and adult bone, but their embryonic origins and development are unclear.
  • Understanding early skeletal development is key to regenerative medicine and congenital bone disorder research.

Purpose of the Study:

  • To map the transcriptional landscape of human embryonic limb buds and long bones at single-cell resolution.
  • To identify and characterize early skeletal stem/progenitor cells during human skeletogenesis.

Main Methods:

  • Single-cell RNA sequencing of human embryonic limb buds and long bones.
  • Transcriptional landscape mapping and cell alignment along axes.
  • Identification of cell surface markers and transcriptional networks.

Main Results:

  • Discovered significant cellular heterogeneity in human limb bud mesenchyme and epithelium.
  • Identified osteo-chondrogenic progenitors in the core limb bud mesenchyme.
  • Characterized a perichondrial embryonic skeletal stem/progenitor cell (eSSPC) subset marked by CADM1 and the FOXP1/2 network, capable of self-renewal and osteochondral lineage generation.
  • Found similar cell populations in embryonic calvaria, suggesting roles in intramembranous ossification.

Conclusions:

  • This study reveals the cellular heterogeneity and lineage hierarchy in human embryonic skeletogenesis.
  • Identified distinct eSSPCs orchestrating both endochondral and intramembranous ossification processes.
  • Provides a foundational understanding of early skeletal development and stem cell populations.