Chromatin Conformation
Chromatin Conformation - Related Videos
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.
01:20
Conformity
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2020
Conformity is the change in a person’s behavior to go along with the group, even if that person does not agree with the group. Asch’s Original Study Solomon Asch conducted several experiments in the 1950s to determine how people are affected by the thoughts and behaviors of other people. In one study, a group of participants was shown a series of printed line segments of different lengths: a, b, and c. Participants were then shown a fourth line segment: x. They were asked to identify which...
08:55
A Minority of One: Conformity to Group Norms
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2023
Source: William Brady & Jay Van Bavel—New York University It is obvious that we are influenced by those around us, but in the early to mid 1900's, psychologists began to study how potent social influence can be on our thoughts and behaviors. Motivated in part by attempts to explain the behaviors of Nazi soldiers in World War II, one topic of considerable interest at the time in psychology was conformity, the phenomenon in which people match their attitudes, behaviors, or beliefs to group...
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...
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.
FAQs
DNA packaging does more than fit the genome into the nucleus: it affects regulatory access. Nucleosomes organize DNA, while larger-scale compartments, topologically associating domains, and loops arrange regions that may be far apart along the sequence. These layers of organization can alter whether an enhancer and promoter are positioned to communicate, making three-dimensional structure relevant to gene regulation.
CTCF and cohesin are important structural proteins within the organization of chromatin contacts. The source material identifies them as factors that help establish and maintain DNA loops and related interactions. Their relevance is therefore architectural: they support physical arrangements that bring distant regulatory elements together, allowing researchers to connect genome structure with changes in gene activity.
They represent distinct organizational scales rather than interchangeable names. Compartments describe broad chromosome-level organization, topologically associating domains define regions of local interaction, and DNA loops connect particular sites. Considering these features together helps explain how a regulatory element can be separated from a gene in linear sequence yet brought into proximity within the nucleus.
Chromosome conformation capture and Hi-C differ mainly in scope. Chromosome conformation capture can map interactions across selected regions, making it suited to focused questions about particular genomic locations. Hi-C maps interactions across entire genomes, supporting a broader view of genome-wide organization. The choice therefore depends on whether the investigation targets defined contacts or global patterns.
They can reveal whether regulatory regions are positioned to interact, especially whether enhancers come into physical proximity with promoters. These maps provide structural information about how genes may be switched on or off. In genetics, that information helps researchers examine regulation through three-dimensional genome organization rather than interpreting gene activity solely from the linear DNA sequence.
Genome organization can change during development or disease, making chromatin conformation useful for comparing regulatory states across biological conditions. Researchers can ask whether altered contacts accompany differences in gene activity and whether enhancer-promoter communication changes between conditions. This places three-dimensional genome organization within genetics as a context for studying how regulation changes over time or in disease.