Chromatin and signaling

Tamaki Suganuma1, Jerry L Workman

  • 1Stowers Institute for Medical Research, United States. tas@stowers.org

Insights

Cell signaling pathways coordinate molecules to regulate cell functions and gene activation. Emerging research reveals chromatin receives signals, advancing understanding of development and disease.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Epigenetics

Background:

  • Cellular signaling pathways are crucial for survival, development, and homeostasis.
  • These pathways involve interactions between stimuli, receptors, and enzymes.
  • Signaling molecules often interact with transcriptional machinery and chromatin.

Purpose of the Study:

  • To explore the intricate relationship between cell signaling and chromatin.
  • To understand how signaling pathways regulate gene expression.
  • To investigate the emerging role of chromatin in receiving cellular signals.

Main Methods:

  • Analysis of molecular interactions within signaling pathways.
  • Investigation of transcriptional regulation by signaling molecules.
  • Examination of chromatin modifications in response to cellular signals.

Main Results:

  • Signaling pathways directly influence gene activation via transcription machinery and histone modifications.
  • Evidence suggests chromatin itself acts as a recipient of cellular signals.
  • Novel regulatory mechanisms involving chromatin and signaling are being uncovered.

Conclusions:

  • Cellular signaling profoundly impacts chromatin biology.
  • Chromatin's role in receiving signals opens new avenues for research.
  • Understanding these mechanisms is vital for advancing knowledge in development and disease.

Related Concept Videos

Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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.
Writers
The writer is an enzyme that can...
Histone Modification02:32

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Histone Modification02:32

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
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...
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...