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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...

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...

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...

Nucleosome Remodeling

Nucleosome Remodeling

Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...

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...

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...

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Related Experiment Video

Updated: Jun 1, 2026

HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries

HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries

Published on: March 31, 2019

Chromatin boundaries require functional collaboration between the hSET1 and NURF complexes.

Xingguo Li¹, Shaohua Wang, Ying Li

¹Department of Biochemistry and Molecular Biology, University of Florida College of Medicine, Gainesville, FL 32610, USA.

|June 10, 2011

Summary

Chromatin insulators prevent gene silencing in red blood cells. USF1 protein complexes with hSET1 and NURF maintain active chromatin, preventing anemia by blocking heterochromatin spread.

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Generation and Purification of Human INO80 Chromatin Remodeling Complexes and Subcomplexes

Generation and Purification of Human INO80 Chromatin Remodeling Complexes and Subcomplexes

Published on: October 23, 2014

Area of Science:

Epigenetics
Molecular Biology
Hematopoiesis

Background:

Chromatin insulators are crucial for preventing gene silencing during erythropoiesis.
Disruption of insulator function can lead to anemia.
The mechanism by which insulators establish barrier activity remains unclear.

Purpose of the Study:

To elucidate the molecular mechanism by which USF1-bound insulators establish chromatin barrier activity.
To identify proteins interacting with USF1 and their roles in insulator function.

Main Methods:

Purification of USF1-associated protein complexes.
Analysis of protein complex composition including hSET1 and NURF.
Functional assays measuring chromatin barrier activity upon knockdown or suppression of SET1 and NURF.
Assessment of nucleosome positioning and histone modifications (H3K4me2, H3K27me3, acH3K9/K14).

Main Results:

USF1 forms a complex with hSET1 (histone H3K4 methyltransferase) and NURF (nucleosome remodeling complex).
Recruitment of hSET1 and NURF by USF1 maintains active chromatin structure at the 5'HS4 insulator.
NURF depletion leads to loss of barrier activity, altered nucleosome positioning, and increased repressive H3K27me3.
SET1 suppression reduces barrier activity, alters specific histone marks, and diminishes BPTF recruitment.

Conclusions:

hSET1 and NURF act synergistically with USF1 to establish barrier insulator function.
This coordinated action prevents the encroachment of heterochromatin into erythroid gene loci.
The findings reveal a novel mechanism for maintaining active chromatin and preventing anemia.