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Related Concept Videos

Cohesins02:20

Cohesins

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Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of...
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Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Condensins02:15

Condensins

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Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
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Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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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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Cadherins in Tissue Organization01:19

Cadherins in Tissue Organization

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The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
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The role of the polybromo-associated BAF complex in development.

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Related Experiment Video

Updated: Jan 13, 2026

Using Fluorescence In Situ Hybridization FISH to Monitor the State of Arm Cohesion in Prometaphase and Metaphase I Drosophila Oocytes
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Using Fluorescence In Situ Hybridization FISH to Monitor the State of Arm Cohesion in Prometaphase and Metaphase I Drosophila Oocytes

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Altered Cohesin Dynamics During Cellular Differentiation.

Magdalena Jawor1, Karol Tchorz1, Marcin Ostoja-Helczynski1

  • 1Program in Cell Cycle and Cancer Biology, Oklahoma Medical Research Foundation, 820 NE 15th St., Oklahoma City, OK 73104.

Biorxiv : the Preprint Server for Biology
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Summary

Cell differentiation alters cohesin regulators like WAPL and ESCO1, impacting chromosome dynamics. Cohesin regulators, not abundance, drive these changes, with WAPL crucial for chromosome structure post-differentiation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The cohesin complex is vital for chromosome organization and gene regulation.
  • Understanding cohesin dynamics during cell-state transitions like differentiation is crucial but poorly understood.

Purpose of the Study:

  • To investigate how cohesin regulation changes during mouse embryonic stem cell (mESC) differentiation into cardiomyocytes.
  • To determine the functional impact of altered cohesin regulator levels on chromosome dynamics and cell viability.

Main Methods:

  • Utilized an in vitro differentiation system for mESCs to cardiomyocytes.
  • Employed live-cell Fluorescence Recovery After Photobleaching (FRAP) to assess RAD21 mobility.
  • Generated degron alleles for WAPL and ESCO1 using a dTAG system for acute protein depletion.

Main Results:

  • Core cohesin subunits remained stable, but regulators WAPL and ESCO1 levels decreased during differentiation.
  • Increased cohesin mobility was observed in differentiated cells, suggesting reduced stable chromatin binding.
  • WAPL loss caused cell cycle defects and a 'vermicelli' chromosome phenotype in stem cells; ESCO1 depletion had no significant effect.
  • WAPL was essential for interphase chromosome organization in differentiated cells, even at low levels.

Conclusions:

  • Cohesin regulators, not cohesin protein levels, are the primary drivers of cohesin dynamic changes during cell differentiation.
  • WAPL plays a critical role in maintaining chromosome structural plasticity after cell cycle exit and lineage commitment.