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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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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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TRANSCRIPTIONAL CONTROL OF PROTEIN SYNTHISIS IN THE DEVELOPING OVARIES OF BOMBYX MORI.

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Homoeotic Gene E

Yukie Shinohara1, Katsumi Koga1, Bungo Sakaguchi1

  • 1Laboratory of Sericulture, Faculty of Agriculture, Kyushu University, Fukuoka, 812, Japan.

Development, Growth & Differentiation
|June 7, 2023
PubMed
Summary

The ETc gene in Bombyx larvae regulates ectodermal cell proliferation during embryogenesis. This gene is crucial for differentiating leg-bearing segments from legless ones, impacting larval development.

Area of Science:

  • Developmental biology
  • Genetics
  • Insect embryogenesis

Background:

  • Segment differentiation in Bombyx larvae involves the formation of distinct legged and legless regions.
  • Understanding the genetic control of segment patterning is key to insect development.

Purpose of the Study:

  • To investigate the role of the ETc gene in regulating cell proliferation during Bombyx larval segment differentiation.
  • To determine how the ETc gene influences the development of appendages in abdominal segments.

Main Methods:

  • Light microscopy was used to examine serial sections of developing Bombyx embryos.
  • Comparative analysis of cell numbers in ectodermal layers of normal and mutant embryos.

Main Results:

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  • Ectodermal cell numbers increased significantly in developing leg segments compared to legless segments in normal embryos.
  • In Bombyx embryos with the homoeotic ETc/ETc mutation, abdominal segments failed to develop legs, and ectodermal cell numbers did not increase.
  • The ETc gene appears to control ectodermal cell proliferation linked to abdominal segment differentiation.

    • Conclusions:

    • The ETc gene plays a critical role in controlling ectodermal cell numbers during embryogenesis.
    • This regulation by the ETc gene is essential for the proper differentiation of abdominal segments and appendage formation in Bombyx larvae.