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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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Tracing human stem cell lineage during development using DNA methylation.

Lucas A Salas1, John K Wiencke2, Devin C Koestler3

  • 1Department of Epidemiology, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire 03756, USA.

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|August 4, 2018
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Summary
This summary is machine-generated.

Scientists identified a fetal cell origin (FCO) DNA methylation signature to track stem cell development. This signature reveals dynamic changes in human tissues, particularly leukocytes, from birth through adulthood, highlighting individual variations.

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Stem Cell Biology

Background:

  • Stem cell maturation is crucial for human development but remains poorly understood.
  • Understanding stem cell transitions is key to deciphering developmental processes and disease origins.

Purpose of the Study:

  • To develop and apply a DNA methylation signature to investigate stem cell maturation.
  • To analyze the dynamic changes in cell populations during human development using this signature.

Main Methods:

  • Devised a DNA methylation signature (fetal cell origin, FCO) resembling embryonic stem cells.
  • Applied the FCO signature to analyze multiple human tissues across different developmental stages.
  • Examined leukocyte FCO signature dynamics during the first five years of life and into adulthood.

Main Results:

  • The FCO signature's prevalence varied significantly with developmental stage (fetal vs. adult).
  • Leukocyte FCO signatures showed dynamic transitions in early childhood and persistent individual variation.
  • Genes within the FCO signature are involved in embryonic development, including transcription factors.

Conclusions:

  • The FCO DNA methylation signature effectively traces cell lineage and developmental transitions in humans.
  • This signature provides insights into stem cell heterogeneity under homeostatic conditions.
  • The findings illuminate the evolving nature of stem cell populations throughout human life.