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Attachment of Sister Chromatids

Attachment of Sister Chromatids

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 of a...

Attachment of Sister Chromatids

Attachment of Sister Chromatids

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 of a...

Separation of Sister Chromatids

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 Chromatids

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...

Cohesins

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...

Homologous Recombination

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...

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Related Experiment Video

Updated: Jul 13, 2026

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

Published on: February 13, 2019

Sister chromatid exchange assay.

Laura J Simpson¹, Julian E Sale

¹M.R.C. Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK.

Sub-Cellular Biochemistry

|July 13, 2007

Summary

This summary is machine-generated.

This method visualizes genetic exchanges between sister chromatids, offering a direct readout for crossover recombination. Sister chromatid exchanges (SCEs) increase with DNA damage and in certain genetic backgrounds.

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Last Updated: Jul 13, 2026

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

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Published on: February 13, 2019

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Published on: March 5, 2018

Area of Science:

Genetics
Molecular Biology
Cell Biology

Background:

Sister chromatid exchange (SCE) is a reciprocal exchange of DNA segments between two identical sister chromatids.
SCEs are markers of homologous recombination and can be influenced by DNA damage and genetic factors.
Understanding SCE mechanisms is crucial for comprehending DNA repair and genome stability.

Purpose of the Study:

To describe a method for the direct visualization of genetic exchanges between sister chromatids.
To establish sister chromatid exchange (SCE) as a visual readout for crossover recombination.
To investigate factors influencing SCE generation, including DNA damaging agents and genetic backgrounds.

Main Methods:

Differential staining of sister chromatids during DNA replication.
Direct visualization of genetic exchanges (crossovers) between sister chromatids.
Analysis of SCE frequency in response to genotoxic stress and genetic variations.

Main Results:

The described method allows direct visual detection of crossover recombination events.
Sister chromatid exchange (SCE) generation is dependent on homologous recombination.
SCE frequency is elevated following exposure to DNA damaging agents.
Certain genetic backgrounds associated with increased reliance on recombination pathways show elevated SCEs.

Conclusions:

Sister chromatid exchange (SCE) provides a direct visual measure of crossover recombination.
Elevated SCEs may indicate increased utilization of recombination-based pathways or enhanced resolution of recombination intermediates.
The method offers a valuable tool for studying recombination dynamics and DNA repair mechanisms.