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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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Spatial transcriptomic characterization of a Carnegie stage 7 human embryo.

Lina Cui1, Sirui Lin2,3, Xiaolong Yang4

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This study used spatial transcriptomics to analyze a human embryo during gastrulation, revealing early cell type specifications and germ cell locations. It provides a 3D map of early human development.

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Area of Science:

  • Developmental Biology
  • Genomics
  • Human Embryology

Background:

  • Gastrulation is crucial for establishing germ layers and body axes in mammalian development.
  • Studying human gastrulation is difficult due to limited access to early embryonic tissues.

Purpose of the Study:

  • To analyze a Carnegie stage 7 human embryo using spatial transcriptomics at single-cell resolution.
  • To create a 3D model of the embryo and identify early cell lineage specifications.

Main Methods:

  • Spatial transcriptomics (Stereo-seq) applied to 82 serial cryosections of a human embryo.
  • Three-dimensional reconstruction of the embryo.
  • Immunofluorescence validation in a second embryo.

Main Results:

  • Detailed spatial organization of cell types during human gastrulation.
  • Early specification of mesoderm subtypes and presence of anterior visceral endoderm.
  • Localization of primordial germ cells in the connecting stalk and yolk sac hematopoiesis.

Conclusions:

  • This research provides unprecedented insights into human gastrulation at single-cell resolution.
  • The study offers a valuable 3D spatial map and dataset for early human development research.