Chromatin Microtubules
Chromatin Microtubules - Related Videos
12:20
Preparation of Segmented Microtubules to Study Motions Driven by the Disassembling Microtubule Ends
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Cited by 24 •
2014
Microtubules are inherently unstable polymers, and their switching between growth and shortening is stochastic and difficult to control. Here we describe protocols using segmented microtubules with photoablatable stabilizing caps. Depolymerization of segmented microtubules can be triggered with high temporal and spatial resolution, thereby assisting analysis of motions with the disassembling microtubule ends.
08:39
Chromatin Immunoprecipitation
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2023
Histones are proteins that help organize DNA in eukaryotic nuclei by serving as “scaffolds” around which DNA can be wrapped, forming a complex called “chromatin”. These proteins can be modified through the addition of chemical groups, and these changes affect gene expression. Researchers use a technique called chromatin immunoprecipitation (ChIP) to better understand which DNA regions associate with specific histone modifications or other gene regulatory proteins. Antibodies are used to isolate...
02:21
Chromatin Packaging
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2020
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? The chromatin In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
04:57
Chromatin Shearing: A Method to Generate Chromatin Fragments Using Enzymatic Digestion
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2023
This video describes the protocol for chromatin shearing using micrococcal nuclease enzymatic digestion. Chromatin shearing is an essential step in Chromatin immunoprecipitation or ChIp workflow, which helps investigate protein-DNA interaction in human chronic myeloid leukemia cells. In the feature protocol chromatin shearing is performed using sonication.
02:25
Spreading of Chromatin Modifications
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2020
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex. Writers The writer is an enzyme that can...
FAQs
The Ran-GTP gradient provides a spatial signal around chromosomes during cell division. Ran-GTP releases spindle-assembly factors from importin complexes, removing their inhibition near chromatin. These locally available factors promote microtubule nucleation, stabilization, and organization, concentrating spindle-building activity where chromosomes are present rather than distributing it uniformly throughout the cell.
Importin complexes restrain spindle-assembly factors until Ran-GTP acts nearby. Their release mechanism creates a controlled transition from inhibition to microtubule-promoting activity around chromatin. This regulation is important because it links microtubule production to chromosome position, helping establish an organized spindle environment during mitosis instead of allowing unrestricted assembly.
After forming near chromatin, these microtubules can interact with kinetochores and other spindle components. Such interactions help establish chromosome attachments and coordinate force production within the mitotic spindle. Their contribution therefore extends beyond local assembly: they help connect chromosome-associated structures with the larger mechanical system responsible for chromosome movement and segregation.
Chromatin microtubules provide a way to examine spindle formation that does not depend entirely on centrosomes. Their chromosome-associated assembly shows how local molecular signals can organize spindle components directly around genetic material. This perspective is important for explaining how cells can build functional spindle structures through chromatin-centered mechanisms during division.
Research on chromatin microtubules can clarify how mitotic spindles become organized and how chromosome segregation achieves fidelity. It can also reveal where errors arise when chromosome attachments or force coordination fail. These findings connect the molecular behavior of spindle components with broader cellular defects associated with chromosome missegregation in developmental disorders and cancer.
They offer a mechanistic framework for linking local spindle assembly near chromosomes to accurate chromosome distribution during mitosis. Investigators can use this relationship to interpret how disrupted nucleation, stabilization, organization, or kinetochore interactions might compromise division. The resulting context is relevant to studying mitotic fidelity and the cellular consequences of chromosome missegregation.