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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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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 cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
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Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
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Development: sketch for a theory of Oct4.

Ryan T Wagner1, Thomas P Zwaka2

  • 1Department of Developmental and Regenerative Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA.

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|November 23, 2013
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Summary

Oct4, a key stem cell pluripotency factor, also regulates cell adhesion. This conserved role across species helps explain Oct4's diverse functions in controlling cell behaviors and lineage specification.

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Area of Science:

  • Developmental Biology
  • Stem Cell Biology
  • Molecular Biology

Background:

  • Oct4 is a crucial transcription factor regulating pluripotency in embryonic stem cells.
  • The precise mechanisms by which Oct4 controls lineage specification remain incompletely understood.
  • Understanding Oct4's multifaceted roles is vital for stem cell research and regenerative medicine.

Purpose of the Study:

  • To investigate the conserved functions of Oct4 beyond pluripotency.
  • To identify common Oct4 targets across different vertebrate species.
  • To elucidate Oct4's role in mediating cell adhesion and its implications for lineage specification.

Main Methods:

  • Comparative analysis of Oct4 target genes in various vertebrate species.
  • Bioinformatic approaches to identify evolutionarily conserved Oct4 binding sites.
  • Functional assays to assess the impact of Oct4 on cell adhesion properties.

Main Results:

  • Identification of a conserved set of Oct4 target genes across vertebrate species.
  • Evidence for a significant role of Oct4 in regulating genes involved in cell adhesion.
  • Demonstration that Oct4's function in cell adhesion is evolutionarily conserved.

Conclusions:

  • Oct4's role extends beyond pluripotency to include the regulation of cell adhesion.
  • This conserved function in cell adhesion provides a potential mechanism for Oct4's involvement in lineage specification.
  • The findings offer new insights into the versatility of Oct4 in governing diverse stem cell behaviors.