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Related Concept Videos

Position-effect Variegation02:32

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.
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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...

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Updated: May 18, 2026

Immunofluorescent Staining for Visualization of Heterochromatin Associated Proteins in Drosophila Salivary Glands
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Immunofluorescent Staining for Visualization of Heterochromatin Associated Proteins in Drosophila Salivary Glands

Published on: August 21, 2021

Chromomeres revisited.

Herbert C Macgregor1

  • 1School of Biosciences, University of Exeter, Exeter, EX4 4SB, UK. herbert.macgregor@btinternet.com

Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology
|September 8, 2012
PubMed
Summary
This summary is machine-generated.

Lampbrush chromosomes (LBCs) exhibit dynamic chromomeres crucial for transcription, not genetic units. Their unique chromatin structure facilitates gene expression during meiosis while preventing structural damage.

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Genome-wide Snapshot of Chromatin Regulators and States in Xenopus Embryos by ChIP-Seq

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Lampbrush chromosomes (LBCs) are large, transcriptionally active structures found in oocytes of many vertebrates.
  • The chromomeric organization of LBCs has been studied for decades, with ongoing debate about their precise nature and function.

Purpose of the Study:

  • To review the historical studies on chromomeres within LBCs.
  • To synthesize current evidence regarding the composition, function, and dynamic nature of chromomeres.
  • To elucidate the relationship between chromomere structure and transcriptional activity.

Main Methods:

  • Historical literature review.
  • Compilation and analysis of evidence from molecular and cytological studies.
  • Comparison of chromomere chromatin with condensed metaphase chromosome chromatin.

Main Results:

  • Chromomeres are not generally genetic units, though some contain specific repeated DNA sequences.
  • Chromomere formation correlates with increased transcriptional activity on LBC loops.
  • LBC chromomere chromatin is highly dynamic, distinct from condensed chromosomes, facilitating localized transcription.

Conclusions:

  • LBCs are transcriptionally specialized structures, with chromomeres playing a key role in regulating gene expression.
  • The dynamic chromatin state of LBC chromomeres is essential for meiosis and is maintained by the absence of interfering molecular factors.