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Inheritance of Chromatin Structures

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...

Histone Modification

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 Modification

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,...

Spreading of Chromatin Modifications

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 Variants at the Centromere

Histone Variants at the Centromere

Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...

Heterochromatin

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...

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Related Experiment Video

Updated: May 27, 2026

Deacetylation Assays to Unravel the Interplay between Sirtuins (SIRT2) and Specific Protein-substrates

Deacetylation Assays to Unravel the Interplay between Sirtuins (SIRT2) and Specific Protein-substrates

Published on: February 27, 2016

Sirtuin 1 (SIRT1): the misunderstood HDAC.

Walter Stünkel¹, Robert M Campbell

¹Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR ), Singapore.

Journal of Biomolecular Screening

|November 17, 2011

Summary

This summary is machine-generated.

Sirtuin 1 (SIRT1) is a tumor suppressor, not an oncogene, in cancer. New strategies are needed to develop effective SIRT1 inhibitors for cancer therapy.

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Last Updated: May 27, 2026

Deacetylation Assays to Unravel the Interplay between Sirtuins (SIRT2) and Specific Protein-substrates

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Published on: February 27, 2016

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Published on: January 26, 2024

Discovering Protein Interactions and Characterizing Protein Function Using HaloTag Technology

Discovering Protein Interactions and Characterizing Protein Function Using HaloTag Technology

Published on: July 12, 2014

Area of Science:

Biochemistry
Molecular Biology
Oncology

Background:

The sirtuin family comprises seven mammalian NAD-dependent histone deacetylases (HDACs), SIRT1-7.
Sirtuins, including SIRT1 and SIRT2, deacetylate both histone and non-histone substrates.
SIRT1 activators have been explored for various diseases, but concerns exist regarding assay artifacts.

Purpose of the Study:

To review recent developments in SIRT1 function, particularly in oncology.
To present evidence for SIRT1 acting as a context-specific tumor suppressor.
To discuss challenges and future directions for developing SIRT1 inhibitors in cancer therapy.

Main Methods:

Literature review of sirtuin function and cancer biology.
Analysis of studies investigating SIRT1's role in tumorigenesis.
Evaluation of current SIRT1 inhibitor development and therapeutic potential.

Main Results:

Compelling data suggest SIRT1 functions as a context-specific tumor suppressor.
Previous findings supporting SIRT1 as an oncogene may be attributed to assay artifacts.
Development of effective and selective SIRT1 inhibitors for oncology remains challenging.

Conclusions:

SIRT1's role in cancer is complex and context-dependent, leaning towards tumor suppression.
Improved model systems and more potent, selective inhibitors are crucial for therapeutic success.
Expanding selectivity to include other sirtuins, like SIRT2, may offer new therapeutic avenues.