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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 spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
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Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously...
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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 (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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Related Experiment Video

Updated: Feb 10, 2026

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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Checkpoints of melanocyte stem cell development.

Lukas Sommer1

  • 1Institute of Cell Biology, Swiss Federal Institute of Technology, ETH-Hoenggerberg HPM E38, CH-8093 Zürich, Switzerland. lukas.sommer@cell.biol.ethz.ch

Science'S STKE : Signal Transduction Knowledge Environment
|August 25, 2005
PubMed
Summary

The adult hair follicle

Area of Science:

  • Stem cell biology
  • Dermatology
  • Hair follicle biology

Background:

  • The bulge region of the adult hair follicle harbors stem cells for both epithelium and melanocytes.
  • Key regulators of melanocyte stem cell development include transcription factors (Pax3, Sox10, Mitf) and Wnt signaling.
  • The complete regulatory network and interactions are not fully understood.

Purpose of the Study:

  • To identify novel signaling pathways regulating melanocyte stem cell maintenance and differentiation.
  • To investigate the role of epithelial stem cells in influencing melanocyte stem cell fate.
  • To elucidate the complex interplay between different stem cell populations within the hair follicle niche.

Main Methods:

  • This study will likely involve molecular biology techniques, genetic manipulation, and in vivo imaging.

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  • Investigating gene expression patterns and protein interactions.
  • Utilizing mouse models to study stem cell behavior in the hair follicle.

    • Main Results:

    • This section is not applicable as the abstract does not contain results.
    • Further research is needed to identify the specific signals and their mechanisms of action.
    • The study aims to uncover new factors that control stem cell behavior.

    Conclusions:

    • Understanding the intricate signaling networks within the hair follicle is crucial for regenerative medicine and treating hair disorders.
    • Identifying novel regulators could lead to therapeutic strategies for hair growth and pigmentation.
    • The interaction between epithelial and melanocyte stem cells is a key area for future investigation.