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Related Concept Videos

Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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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...
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Polytene Chromosomes02:04

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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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Chromosome Structure02:40

Chromosome Structure

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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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Attachment of Sister Chromatids02:57

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As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
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Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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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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Related Experiment Video

Updated: Sep 19, 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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Mitotic chromosomes harbor cell type- and species-specific structural features within a universal loop array

Marlies E Oomen1, A Nicole Fox1,2, Inma Gonzalez3

  • 1Department of Systems Biology, University of Massachusetts Chan Medical School, Worcester, Massachusetts 01605, USA.

Genome Research
|June 6, 2025
PubMed
Summary
This summary is machine-generated.

Mitotic chromosome folding is not cell type-specific, but species-specific differences exist. Maintained CTCF binding in mouse cells does not alter chromosome folding, suggesting condensins control species-specific loop sizes.

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Last Updated: Sep 19, 2025

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Area of Science:

  • Cell Biology
  • Genomics
  • Chromatin Structure

Background:

  • Mitotic chromosomes are generally thought to have universal loop array folding.
  • Previous work showed CTCF binding differs between human cells and mouse embryonic stem cells (mESCs) during mitosis.
  • This study investigates the role of retained CTCF binding in mitotic chromosome organization.

Purpose of the Study:

  • To determine if CTCF binding influences mitotic chromosome organization.
  • To investigate species-specific differences in mitotic chromosome folding.
  • To explore the role of condensins in species-specific chromosome compaction.

Main Methods:

  • Footprint ATAC-seq in mouse embryonic stem cells (mESCs), somatic mouse, and human cells.
  • Hi-C analysis of mESCs to assess chromosome organization.
  • Microscopy measurements of chromosome compaction.

Main Results:

  • CTCF binding in mESCs during mitosis was confirmed, unlike in human cells.
  • No interphase structures (TADs, loops) were found at bookmarked CTCF sites in mESCs.
  • Mitotic loop sizes differ across species (chicken < human < mouse) and correlate with chromosome arm length.

Conclusions:

  • Maintained CTCF binding in mESCs does not alter mitotic chromosome folding.
  • Condensins likely regulate species-specific mitotic chromosome dimensions by controlling loop size.
  • Mitotic chromosome organization shows species-specific, not cell type-specific, variations.