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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Genome-wide Snapshot of Chromatin Regulators and States in Xenopus Embryos by ChIP-Seq
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Overview of chromatin regulatory processes during surface ectodermal development and homeostasis.

Meagan C Branch1, Madison Weber1, Meng-Yen Li1

  • 1Black Family Stem Cell Institute, Department of Cell, Developmental, and Regenerative Biology, Icahn School of Medicine at Mount Sinai, New York, NY, USA.

Developmental Biology
|July 6, 2024
PubMed
Summary

The ectoderm forms crucial organs like the epidermis. Epigenetic regulation, including chromatin modifications, is vital for surface ectoderm development and maintaining organ function.

Keywords:
Chromatin regulationDevelopmentEpigeneticsHomeostasisSurface ectoderm

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Area of Science:

  • Developmental biology
  • Epigenetics
  • Cell biology

Background:

  • The ectoderm is a primary germ layer in early embryonic development.
  • It gives rise to the surface ectoderm and neural ectoderm.
  • Surface ectoderm forms the epidermis and associated organs.

Purpose of the Study:

  • To review recent discoveries on epigenetic regulation in surface ectoderm development.
  • To highlight the role of chromatin regulatory mechanisms.
  • To discuss maintenance of organ homeostasis post-development.

Main Methods:

  • Literature review of recent discoveries.
  • Focus on transcription factors and epigenetic modifications (histone and DNA).
  • Analysis of gene expression programs.

Main Results:

  • Epigenetic mechanisms are crucial for surface ectodermal organogenesis.
  • Chromatin regulatory mechanisms, including transcription factors and histone/DNA modifications, are key.
  • These mechanisms are essential for both development and homeostasis.

Conclusions:

  • Epigenetic regulation is fundamental for the development and maintenance of surface ectodermal organs.
  • Understanding these chromatin-mediated mechanisms offers insights into organ homeostasis.
  • Recent discoveries underscore the importance of epigenetics in developmental biology.