Sonication Chromatin
Sonication Chromatin - Related Videos
04:57
Chromatin Shearing: A Method to Generate Chromatin Fragments Using Enzymatic Digestion
0 Views •
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.
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.
11:09
Chromatin Isolation by RNA Purification (ChIRP)
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Cited by 380 •
2012
ChIRP is a novel and rapid technique to map genomic binding sites of long noncoding RNAs (lncRNAs). The method takes advantage of the specificity of anti-sense tiling oligonucleotides to allow the enumeration of lncRNA-bound genomic sites.
07:24
Sonication Extraction of Lipid Biomarkers from Sediment
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2023
Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst The material comprising the living "organic" share of any ecosystem (leaves, fungi, bark, tissue; Figure 1) differs fundamentally from the material of the non-living "inorganic" share (rocks and their constituent minerals, oxygen, water, metals). Organic material contains carbon linked to a series of other carbon and hydrogen molecules (Figure 2), which distinguishes it from inorganic material. Carbon's wide valency range...
FAQs
Repeated high-frequency vibrations generate mechanical forces within the chromatin sample. Those forces progressively shear DNA associated with proteins, including material preserved through cross-linking or left in a native state. The extent of shearing determines how large the recovered DNA pieces are, which directly affects the genomic resolution possible in downstream analyses.
Input energy, processing time, and temperature are central controls for sonication chromatin fragmentation. Changing the applied energy or duration alters the amount of mechanical shearing, while temperature control helps maintain consistent processing conditions. Managing these variables is important because uneven or poorly controlled fragmentation can produce a less consistent fragment-size range for downstream assays.
Sonication can be applied to both cross-linked and native chromatin, but the starting material differs in whether chromatin associations have been preserved through cross-linking. This distinction matters when interpreting protein-DNA relationships in later assays. In either case, controlled ultrasonic processing is needed to obtain fragments suitable for analyzing interactions and regulatory features.
A consistent fragment-size range improves the reliability and resolution of downstream measurements. When fragments are more uniform, chromatin immunoprecipitation and related sequencing workflows can more clearly associate recovered DNA with protein-binding or regulatory regions. Poorly controlled size variation can make genomic patterns harder to resolve and reduce confidence when comparing chromatin-associated signals.
Chromatin is exposed to repeated ultrasonic energy while energy input, temperature, and processing time are controlled. These conditions determine how extensively the material is sheared and help produce a consistent fragment-size range. The processed chromatin can then move into chromatin immunoprecipitation or related sequencing workflows, where fragment quality influences the resulting analysis.
Once fragmentation is complete, the preparation can enter chromatin immunoprecipitation and related sequencing workflows. These workflows use the fragmented material to examine where particular proteins associate with DNA, including sites marked by histone modifications or occupied by transcription factors. Sonication therefore supports both interaction mapping and downstream genomic analysis.
In biology, this approach supports studies of gene regulation, epigenetics, and genome organization. By preparing chromatin for analysis of protein-DNA associations, researchers can investigate transcription-factor binding sites and regions associated with histone modifications. The resulting data help connect chromatin structure and regulatory features with patterns of genomic control.