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Euchromatin

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...

Duplication of Chromatin Structure

Duplication of Chromatin Structure

The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...

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...

Euchromatin

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...

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...

Chromatin Packaging

Chromatin Packaging

Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...

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Related Experiment Video

Updated: Jul 15, 2026

Chromatin Extraction from Frozen Chimeric Liver Tissue for Chromatin Immunoprecipitation Analysis

Chromatin Extraction from Frozen Chimeric Liver Tissue for Chromatin Immunoprecipitation Analysis

Published on: March 23, 2021

Chromatin structure revisited.

J Zlatanova¹, S H Leuba, K van Holde

¹Biochip Technology Center, Argonne National Laboratory, IL 60439-4833, USA.

Critical Reviews in Eukaryotic Gene Expression

|January 29, 2000

Summary

The core particle structure requires a broader definition, encompassing variable DNA lengths and dynamic linker regions. The term "30-nm fiber" should be abandoned for describing compact chromatin.

Area of Science:

Molecular Biology
Epigenetics
Chromatin Structure

Background:

Despite advances, fundamental questions about chromatin core particle structure persist.
Existing definitions of the core particle may not fully capture the dynamic nature of DNA wrapping and linker regions.

Purpose of the Study:

To redefine the 'core particle' concept based on variable DNA lengths.
To clarify the role of linker histones and HMG1 in chromatosome formation.
To describe the dynamic nature of DNA partitioning in extended chromatin fibers and question the utility of the '30-nm fiber' term.

Main Methods:

Conceptual analysis and re-evaluation of existing structural data on chromatin.
Integration of findings regarding histone octamer-DNA interactions.

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A Multilabel Single Molecule Localization Microscopy Protocol for Investigation of Chromatin in the Dense Nuclear Environment

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Last Updated: Jul 15, 2026

Chromatin Extraction from Frozen Chimeric Liver Tissue for Chromatin Immunoprecipitation Analysis

Chromatin Extraction from Frozen Chimeric Liver Tissue for Chromatin Immunoprecipitation Analysis

Published on: March 23, 2021

Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

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Published on: May 12, 2023

A Multilabel Single Molecule Localization Microscopy Protocol for Investigation of Chromatin in the Dense Nuclear Environment

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Discussion of chromatosome and extended fiber structures.

Main Results:

The DNA length associated with the histone octamer varies (100-170 bp).
Linker histones bridge DNA termini to the dyad axis in chromatosomes.
HMG1-containing particles qualify as chromatosomes; linker DNA is dynamic.
Compact fiber structure is irregular, and the '30-nm fiber' designation is deemed inappropriate.

Conclusions:

The definition of the core particle needs expansion to include variable DNA lengths.
Chromatosome structure and the role of HMG1 are clarified.
The dynamic nature of chromatin fibers and the inadequacy of the '30-nm fiber' model are highlighted.