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Updated: Jun 5, 2026
12:46
Using Fluorescence In Situ Hybridization (FISH) to Monitor the State of Arm Cohesion in Prometaphase and Metaphase I Drosophila Oocytes
Published on: December 6, 2017
Sister chromatid cohesion control and aneuploidy
1Cell Proliferation and Development Program, Chromosome Dynamics in Meiosis Laboratory, Centro de Investigaciones Biológicas (CSIC), Madrid, Spain. jlbarbero@cib.csic.es
Cytogenetic and Genome Research
|January 22, 2011
Summary
Cohesin, a protein complex, regulates cell division. Dysfunctional cohesin is linked to Down syndrome, cancer, and infertility, highlighting its crucial role in cell health and disease.
Area of Science:
- Cell Biology
- Genetics
- Molecular Medicine
Background:
- Sister chromatid cohesion is vital for accurate chromosome segregation during cell division.
- Cohesin, a protein complex, governs the establishment, maintenance, and removal of sister chromatid cohesion.
- Errors in cohesion control can cause cell death or aneuploidy.
Purpose of the Study:
- To explore the common biological underpinnings of Down syndrome, cancer, and infertility.
- To investigate the role of the cohesin protein complex in cell division and non-dividing cells.
- To understand cohesinopathies and their implications in human genetic disorders.
Main Methods:
- Review of molecular mechanisms regulating sister chromatid cohesion.
- Analysis of cohesin and cohesin-interacting proteins in mitosis and meiosis.
- Examination of cohesin's functions in both dividing and non-dividing cells.
Main Results:
- Cohesin plays a central role in regulating sister chromatid cohesion during cell division.
- Cohesin dysfunction is implicated in conditions such as Down syndrome, cancer, and infertility.
- Emerging evidence points to cohesin's significant functions in non-dividing cells, expanding the concept of cohesinopathies.
Conclusions:
- The cohesin complex is fundamental to preventing aneuploidy and maintaining genomic stability.
- Understanding cohesin regulation offers insights into diverse human diseases, including cohesinopathies.
- Further research into cohesin's multifaceted roles is crucial for therapeutic advancements.
Related Concept Videos
02:20Cohesins
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...
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...
02:20Cohesins
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...
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...
02:57Attachment 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...
02:57Attachment 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...
02:17Separation 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...
At the onset of anaphase, separase, a proteolytic enzyme, is...
02:17Separation 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...
At the onset of anaphase, separase, a proteolytic enzyme, is...