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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

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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.
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The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...
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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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New insights into cohesin loading.

Ireneusz Litwin1, Robert Wysocki2

  • 1Institute of Experimental Biology, University of Wroclaw, 50-328, Wroclaw, Poland. ireneusz.litwin@uwr.edu.pl.

Current Genetics
|June 21, 2017
PubMed
Summary

Cohesin, a protein complex vital for chromosome segregation and gene regulation, is loaded by the Scc2-Scc4 complex. Disruptions in cohesin or its loader can cause developmental disorders and cancer.

Keywords:
Chromatin remodelerCohesinCohesin loadingScc2Scc4

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Cohesin is a protein complex essential for accurate chromosome segregation during cell division.
  • It also regulates gene expression, DNA condensation, and DNA repair pathways.
  • The Scc2-Scc4 complex is critical for the proper loading of cohesin onto chromatin.

Purpose of the Study:

  • To summarize recent advancements in understanding the Scc2-Scc4 complex.
  • To review the process of cohesin loading onto chromatin.
  • To discuss factors influencing Scc2-Scc4 binding to chromatin.

Main Methods:

  • Literature review of recent studies on cohesin and Scc2-Scc4 complex.
  • Analysis of structural and functional data related to cohesin loading.
  • Synthesis of information on chromatin binding mediators.

Main Results:

  • Recent structural insights into the Scc2-Scc4 complex have been elucidated.
  • The mechanisms governing cohesin loading onto chromatin are better understood.
  • Key mediators influencing Scc2-Scc4 chromatin interactions have been identified.

Conclusions:

  • Understanding cohesin and its loader is crucial due to their links to developmental disorders and cancer.
  • Further research into the Scc2-Scc4 complex and its regulation will advance cell biology and disease understanding.