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Related Concept Videos

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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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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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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 that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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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.
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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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Related Experiment Video

Updated: Aug 5, 2025

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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The LINC Complex Inhibits Excessive Chromatin Repression.

Daria Amiad Pavlov1, C P Unnikannan2, Dana Lorber1

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel.

Cells
|March 29, 2023
PubMed
Summary

The Linker of Nucleoskeleton and Cytoskeleton (LINC) complex prevents gene silencing in muscles. LINC complex disruption increases repressive marks, hindering muscle gene transcription.

Keywords:
LINC complexchromatin repressionepigeneticsmusclenuclear mechanobiology

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Validation of a Mouse Model to Disrupt LINC Complexes in a Cell-specific Manner
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Validation of a Mouse Model to Disrupt LINC Complexes in a Cell-specific Manner

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The Linker of Nucleoskeleton and Cytoskeleton (LINC) complex connects the nucleus to the cytoplasm, sensing mechanical forces.
  • Its role in regulating gene expression and chromatin organization, particularly under mechanical stress, remains poorly understood.

Purpose of the Study:

  • To investigate the mechanism by which the LINC complex influences chromatin repression in muscle tissue.
  • To determine the impact of LINC complex deficiency on gene expression and epigenetic modifications in Drosophila muscles.

Main Methods:

  • Analysis of genomic binding profiles for Polycomb, Heterochromatin Protein1 (HP1a), and RNA Polymerase II (RNA-Pol II) in LINC-deficient Drosophila muscles.
  • Assessment of histone modifications (H3K9me3, H3K27me3, H3K9ac) and chromatin localization.
  • Utilizing computer simulations to model chromatin behavior in LINC mutant cells.

Main Results:

  • LINC complex absence led to increased Polycomb repressor binding and decreased RNA-Pol II binding at muscle genes.
  • Elevated levels of repressive histone marks (H3K9me3, H3K27me3) and reduced activating marks (H3K9ac) were observed.
  • LINC mutants exhibited larger H3K27me3 clusters and altered chromatin distribution, moving away from the nuclear envelope.

Conclusions:

  • The LINC complex is crucial for preventing excessive chromatin repression in mechanically active muscle cells.
  • By promoting chromatin-nuclear envelope interactions, the LINC complex limits the formation of repressive Polycomb clusters.
  • This regulation by the LINC complex is essential for robust gene transcription in muscle fibers.