Related Experiment Video
Updated: Mar 2, 2026
05:35
Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
Published on: March 3, 2016
15.7K
Stopping chromosomes from breaking bad
Rima Sandhu1, G Valentin Börner1
1Center for Gene Regulation in Health and Disease, Cleveland State University, Cleveland, United States.
Elife
|May 10, 2017
Summary
Chromosome scaffolding is crucial for preventing DNA damage. This structure limits double-strand breaks, maintaining genomic stability.
Area of Science:
- Genetics and Molecular Biology
- Cell Biology
Background:
- Chromosome structure and organization are fundamental to genome integrity.
- DNA double-strand breaks (DSBs) are highly toxic lesions that can lead to mutations and cell death.
Purpose of the Study:
- To investigate the role of the chromosomal scaffold in regulating DNA double-strand breaks.
- To understand how the structural organization of chromosomes impacts DNA repair.
Main Methods:
- Utilizing advanced microscopy techniques to visualize chromosome structure.
- Employing molecular assays to quantify levels of DNA double-strand breaks.
Main Results:
- The chromosomal scaffold significantly restricts the occurrence of DNA double-strand breaks.
- Proper scaffold formation correlates with reduced DSB accumulation.
Conclusions:
- The chromosomal scaffold is a critical determinant of genome stability.
- Targeting scaffold components may offer therapeutic strategies for preventing DNA damage.
Related Concept Videos
02:19The Spindle Assembly Checkpoint
3.9K
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
3.9K
02:11Forces Acting on Chromosomes
4.0K
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...
4.0K
02:04Fixing Double-strand Breaks
15.4K
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
15.4K
02:04Fixing Double-strand Breaks
4.5K
4.5K
02:15Condensins
4.8K
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...
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...
4.8K
02:17Separation of Sister Chromatids
4.6K
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...
4.6K