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Related Concept Videos

Heterochromatin02:38

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...
Heterochromatin02:38

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...
Euchromatin01:01

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...
Nucleosome Remodeling02:54

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...
Meiosis I01:49

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...

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Related Experiment Video

Updated: Jun 2, 2026

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
10:39

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

Published on: February 26, 2018

Stable and dynamic nucleosome states during a meiotic developmental process.

Liye Zhang1, Hong Ma, B Franklin Pugh

  • 1Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Genome Research
|April 26, 2011
PubMed
Summary

Chromatin organization is largely fixed during meiosis, with nucleosome repositioning used sparingly for specific gene access. Histone modifications remain stable, indicating a stable genomic structure with minor, program-specific adjustments.

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Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae
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Last Updated: Jun 2, 2026

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
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Published on: February 26, 2018

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Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae
07:48

Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae

Published on: October 11, 2022

Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Chromatin plasticity during meiosis is poorly understood.
  • Understanding how genome organization changes during development is crucial.

Purpose of the Study:

  • To investigate genome-wide nucleosome organization and histone modifications during meiotic development.
  • To determine the role of nucleosome repositioning and histone modifications in regulating gene expression during meiosis.

Main Methods:

  • Generated genome-wide maps of nucleosome positions, occupancy, and histone modifications (H3K9ac, H3K4/K36/K79me3).
  • Analyzed these maps during meiotic spore development (gametogenesis) in Saccharomyces.
  • Investigated changes during both normal meiotic progression and an acute meiotic starvation response.

Main Results:

  • Nucleosome organization remained largely constant during genome compaction.
  • Nucleosome repositioning occurred during starvation response, altering transcriptional start site accessibility.
  • Histone modification states were stable and abundant at specific nucleosome positions for most genes.
  • Antisense control, not nucleosome repositioning, dominated most meiotic programs.

Conclusions:

  • Genomic chromatin organization is primarily a fixed property of chromosomes during meiosis.
  • Nucleosome repositioning is a restricted mechanism, utilized in a program-specific manner.
  • Histone modifications are stable, suggesting a conserved regulatory role despite low gene transcription.