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Related Concept Videos

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Heterochromatin

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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...
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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
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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. 
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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.
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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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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
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Related Experiment Video

Updated: Jan 18, 2026

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization
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Inferring chromatin architecture at a single locus through probabilistic in situ DNA localization.

Minh Tam Le1, James McGehee1, Leslie Dunipace1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, 1200 East California Blvd, Pasadena, CA, USA.

Nature Communications
|January 15, 2026
PubMed
Summary

We developed PLOTTED (Probabilistic Localization of Oligopaint Tagged Target Element Distances) to measure nanoscale chromatin organization. This new method reveals how DNA folding dynamics impact gene regulation during development.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genomics

Background:

  • Chromatin conformation is crucial for enhancer function but challenging to measure at the nanoscale.
  • Understanding dynamic chromatin organization is key to deciphering gene regulation.

Purpose of the Study:

  • To introduce PLOTTED (Probabilistic Localization of Oligopaint Tagged Target Element Distances), a novel framework for inferring chromatin architecture.
  • To quantitatively model chromatin configurations and their impact on gene regulation.

Main Methods:

  • Integrated imaging and computational analysis of targeted high-resolution imaging of cis-regulatory modules (CRMs).
  • PLOTTED generates spatial distance distributions between DNA loci to model chromatin configurations.
  • Application to the brinker locus in Drosophila embryos to measure CRM distances.

Main Results:

  • PLOTTED successfully inferred dynamic chromatin architecture changes at the brinker locus during Drosophila development.
  • CRM configurations shifted dynamically in wild type embryos, with delayed changes observed in mutants.
  • Conformational changes along spatial axes (dorsal-ventral, anterior-posterior) correlated with altered gene expression.

Conclusions:

  • PLOTTED provides a probabilistic, single-locus framework for interpreting chromatin architecture.
  • The study demonstrates the link between dynamic chromatin geometry and regulatory activity in development.
  • Findings offer insights into chromatin's role in development and disease.