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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...

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...

Forces Acting on Chromosomes

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...

DNA Packaging

DNA Packaging

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...

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Related Experiment Video

Updated: Sep 12, 2025

A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis

A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis

Published on: December 19, 2015

Differential Crosslinking and Contractile Motors Drive Nuclear Chromatin Compaction.

Ligesh Theeyancheri¹, Edward J Banigan², J M Schwarz^1,3

¹Physics Department, Syracuse University, Syracuse, NY 13244 USA.

Biorxiv : the Preprint Server for Biology

|August 8, 2025

Summary

A new model explains how cells organize chromatin. Contractile motors and crosslinking density drive the segregation of active euchromatin and repressed heterochromatin, matching experimental data.

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Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation

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A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

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Last Updated: Sep 12, 2025

A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis

A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis

Published on: December 19, 2015

Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation

Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation

Published on: September 14, 2011

A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton

Published on: July 29, 2018

Area of Science:

Biophysics
Molecular Biology
Computational Biology

Background:

Cell nuclei exhibit spatial compartmentalization of euchromatin and heterochromatin during interphase.
Heterochromatin is denser than euchromatin and typically located at the nuclear periphery, influenced by the deformable nuclear lamina.
Previous studies focused on rigid nuclei, leaving mechanisms in deformable nuclear environments less explored.

Purpose of the Study:

To investigate the biophysical mechanisms governing chromatin compartmentalization within a deformable nuclear model.
To explore the roles of contractile motors, lamina deformability, and crosslink distribution in genomic organization.

Main Methods:

Development of a computational model simulating chromatin as an active, crosslinked polymer tethered to a deformable, polymeric lamina shell.
Analysis of the model's behavior under varying parameters, including contractile motor activity and radial crosslink density distribution.

Main Results:

A radial crosslink density gradient, with higher density at the nuclear edge, combined with contractile motor activity, drives genomic segregation.
Contractile motors concentrate crosslinks at the periphery, forming dense heterochromatin domains and explaining experimental observations.
The model predicts increased nuclear stiffness due to heterochromatin compaction beneath the lamina, consistent with nanoindentation experiments.

Conclusions:

Contractile motors and specific crosslinking patterns are key drivers of chromatin compartmentalization in deformable nuclei.
The model provides a biophysical explanation for heterochromatin peripheral localization and its impact on nuclear mechanics.
Predictions offer avenues for experimental validation of the proposed mechanisms.