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Chromatin Position Affects Gene Expression

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.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...

Position-effect Variegation

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.

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...

The Nucleosome

The Nucleosome

Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...

The Nucleosome

The Nucleosome

DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...

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Related Experiment Video

Updated: Jul 2, 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

Nucleosome positioning in human HOX gene clusters.

Peter V Kharchenko¹, Caroline J Woo, Michael Y Tolstorukov

¹Harvard Partners Center for Genetics and Genomics, Boston, Massachusetts 02115, USA.

Genome Research

|August 30, 2008

Summary

Nucleosome positioning in human HOX gene clusters reveals unique organization and sequence properties. Active transcription surprisingly correlates with increased nucleosome positioning, impacting gene regulation.

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Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA

Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA

Published on: September 10, 2013

Area of Science:

Genomics
Epigenetics
Molecular Biology

Background:

Nucleosome distribution is crucial for chromatin structure and gene regulation by controlling DNA accessibility.
Understanding nucleosome organization in mammalian genomes, especially HOX gene clusters, remains limited.

Purpose of the Study:

To investigate stable nucleosome positions within human HOX gene clusters.
To characterize the sequence properties and long-range organization of nucleosomes in mammalian genomes.

Main Methods:

Utilized tiled microarrays to map nucleosome positions.
Analyzed nucleosome organization in human cell lines, focusing on HOX gene clusters.

Main Results:

Identified nucleosome positioning with distinct sequence properties and long-range organization compared to other organisms.
Observed regular nucleosomal arrays with 195-bp periodicity at specific loci, often near the 3' ends of genes.
Found a correlation between active transcription and increased nucleosome positioning.

Conclusions:

Human HOX gene clusters exhibit unique nucleosome organization patterns.
Transcription may play an unexpected role in establishing well-positioned nucleosomes, influencing gene regulation.