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Related Concept Videos

Cohesins02:20

Cohesins

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 homologous...
Cohesins02:20

Cohesins

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 homologous...
Condensins02:15

Condensins

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...
Condensins02:15

Condensins

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...
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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...
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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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Related Experiment Video

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Deciphering Molecular Mechanism of Histone Assembly by DNA Curtain Technique
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Cohesin: a multi-purpose chromatin glue.

Laura A Díaz-Martínez1, Hongtao Yu

  • 1Department of Pharmacology, Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Journal of Molecular Cell Biology
|August 18, 2009
PubMed
Summary

Cohesin, once known for holding sister chromatids together, is now understood to be more versatile. This protein plays a key role in regulating gene transcription through long-distance DNA interactions.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Cohesin is a protein complex traditionally recognized for its role in sister chromatid cohesion during cell division.
  • Emerging evidence suggests cohesin's functions extend beyond its established role in chromosome segregation.

Purpose of the Study:

  • To investigate the newly discovered properties of cohesin.
  • To explore the potential role of cohesin in gene transcription regulation.
  • To understand how cohesin mediates intra-chromosomal interactions.

Main Methods:

  • The study likely involved molecular biology techniques to analyze cohesin's binding properties.
  • Advanced imaging or sequencing methods may have been used to observe intra-chromosomal interactions.
  • Functional assays were probably employed to assess cohesin's impact on transcription.

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Main Results:

  • Cohesin exhibits 'stickier' properties than previously characterized.
  • Cohesin actively participates in regulating gene transcription.
  • Cohesin facilitates long-range interactions within chromosomes.

Conclusions:

  • Cohesin's function is more complex than initially understood, involving roles in both chromosome structure and gene regulation.
  • The protein's ability to mediate long-distance intra-chromosomal interactions is crucial for its newly identified regulatory functions.
  • Further research into cohesin's multifaceted roles could reveal new therapeutic targets.