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Related Concept Videos

Euchromatin01:01

Euchromatin

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.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin01:01

Euchromatin

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.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Eukaryotic Transcription Inhibitors01:52

Eukaryotic Transcription Inhibitors

Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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 DNA...

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Related Experiment Video

Updated: May 11, 2026

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

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Chromatin: a tail of repression.

Danesh Moazed1

  • 1Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA. danesh_moazed@hms.harvard.edu

Current Biology : CB
|May 25, 2013
PubMed
Summary

Genetic mutations in histone H3 lysine 27 (H3K27) in fruit flies mirror developmental defects seen with enzyme mutations. This provides genetic evidence for H3K27

Area of Science:

  • Developmental Biology
  • Epigenetics
  • Genetics

Background:

  • The role of specific histone modifications in metazoan development is not well understood.
  • Histone posttranslational modifications are crucial epigenetic marks regulating gene expression.
  • Genetic evidence linking specific histone residues to developmental processes has been limited.

Purpose of the Study:

  • To investigate the genetic role of histone H3 lysine 27 (H3K27) in metazoan development.
  • To determine if mutations in H3K27 affect developmental processes similarly to mutations in the responsible enzyme.
  • To provide genetic evidence for the functional significance of H3K27 in development.

Main Methods:

  • Generating fruit fly (Drosophila melanogaster) models with mutations in histone H3 lysine 27.

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  • Analyzing homeotic gene expression patterns in these mutant flies.
  • Assessing developmental defects in fruit flies with H3K27 mutations and mutations in the H3K27 trimethyltransferase enzyme.

    • Main Results:

    • Fruit flies with H3K27 mutations exhibited altered homeotic gene expression.
    • These flies displayed developmental defects comparable to those observed in mutants of the H3K27 trimethylating enzyme.
    • The study establishes a direct genetic link between H3K27 and developmental regulation.

    Conclusions:

    • Mutations in histone H3 lysine 27 directly impact metazoan development.
    • H3K27 plays a critical role in regulating homeotic gene expression during development.
    • This study provides key genetic evidence supporting the functional importance of H3K27 modifications in developmental processes.