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Related Concept Videos

Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Duplication of Chromatin Structure02:05

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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.
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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Polytene Chromosomes02:04

Polytene Chromosomes

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Euchromatin01:01

Euchromatin

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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 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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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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Chromatin Packaging01:32

Chromatin Packaging

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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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Related Experiment Video

Updated: Sep 20, 2025

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
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Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II

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3D chromatin structure changes during spermatogenesis and oogenesis.

Shiqiang Zhang1,2, Wanyu Tao1, Jing-Dong J Han1

  • 1Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Center for Quantitative Biology (CQB), Peking University, Beijing 100871, China.

Computational and Structural Biotechnology Journal
|June 6, 2022
PubMed
Summary
This summary is machine-generated.

Gametogenesis involves complex gene regulation and extensive 3D genome reorganization. New Hi-C technology reveals detailed chromatin structure changes during sperm and egg development, impacting gene activity.

Keywords:
Chromatin 3D structureCompartmentsHi-CLoopsOogenesisSpermatogenesisTADs

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Area of Science:

  • Reproductive Biology
  • Genomics
  • Epigenetics

Background:

  • Gametogenesis (spermatogenesis and oogenesis) requires intricate regulation of gene expression and epigenetic modifications.
  • Chromatin 3D structure plays a crucial role in controlling transcriptional activity during cellular differentiation.
  • Understanding these processes is vital for reproductive health and developmental biology.

Purpose of the Study:

  • To review recent advancements in mapping 3D genome organization during gametogenesis.
  • To summarize findings on chromatin 3D structure remodeling in spermatogenesis and oogenesis.
  • To highlight the impact of 3D genome architecture on gene regulation in germ cells.

Main Methods:

  • Utilized 3D genome technologies, primarily Hi-C, for high-resolution mapping of chromosome organization.
  • Analyzed the formation of chromatin loops, topologically associating domains (TADs), and compartments (A/B).
  • Integrated findings from various studies investigating chromatin dynamics during germ cell development.

Main Results:

  • Hi-C technology provides unprecedented resolution for observing 3D genome reorganization during zygogenesis.
  • Significant remodeling of chromatin structure, including loop and TAD formation, occurs during spermatogenesis and oogenesis.
  • These structural changes are directly linked to the regulation of gene expression essential for gamete formation.

Conclusions:

  • The 3D genome architecture undergoes dynamic and precise reorganization during gametogenesis.
  • Advances in 3D genome mapping technologies have significantly enhanced our understanding of these complex processes.
  • Further research into chromatin 3D structure changes will illuminate mechanisms of reproductive development and potential disruptions.