Dna Accessibility
Dna Accessibility - Related Videos
14:37
Accessibility to Clinical Care for People who use Wheelchairs
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2023
Source: Yetsa Tuakli-Wosornu1,2, Jaideep Talwalkar1; 1Yale School of Medicine, 2University of Pittsburgh In the United States, 25% of the general population suffers from one or another type of disability. Ambulatory disabilities, or mobility impairments, represent the most common subcategory, comprising 14% of the country's populace. Different mobility-assistive devices, ranging from canes to scooters, enable increased independence and improved quality of life for those suffering from mobility...
02:40
DNA Replication
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2020
DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied. After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells. Replication in Prokaryotes DNA replication uses a large number of...
11:56
Central Venous Access Device Dressing Change
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2023
Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT Central venous access devices (CVAD), commonly known as central lines or central catheters, are large-bore intravenous (IV) catheters that are introduced into the central circulation. Typically, CVADs terminate in the superior vena cava, just outside of the right atrium of the heart, but they may also terminate in any one of the great veins (i.e., aorta, inferior vena cava, brachiocephalic...
09:31
Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites
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Cited by 56 •
2016
We describe a protocol for amplifying retroviral integration sites from the genomic DNA of infected cells, sequencing the amplified virus-host junctions, and then mapping these sequences to a reference genome. We also describe techniques to quantify the distribution of integration sites relative to various genomic annotations using BEDTools.
04:36
Bisulfite Conversion of Genomic DNA: A Method to Study DNA Methylation in Genomic DNA Samples from Gastrointestinal Cancer Tissue
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2023
This video demonstrates the procedure of bisulfite modification of genomic DNA from gastrointestinal cancer samples. The technique is beneficial for investigating the relationship between genes’ methylation patterns and establishing their contribution to carcinogenesis.
FAQs
Nucleosomes can restrict access by packaging DNA and limiting the ability of regulatory proteins to contact specific sequences. When nucleosome positioning changes, previously obscured promoters or enhancers may become available for transcription-factor binding. This structural regulation helps determine whether particular regulatory regions can participate in controlling gene activity in a cell.
Chromatin remodeling changes the organization of nucleosomes, which can expose or conceal regulatory DNA without changing the underlying sequence. This process provides cells with a way to adjust regulatory access as gene-control requirements change. Its effects are therefore relevant to shifts in gene activity associated with development, differentiation, and environmental responses.
Epigenetic changes can modify chromatin states and thereby influence whether regulatory sequences remain available to DNA-binding proteins. These changes act at the level of genome organization rather than altering the DNA sequence itself. Examining their effects helps researchers connect chromatin state with differences in gene regulation among cell types or biological conditions.
Accessible regulatory regions are more likely to permit transcription factors to bind their target sequences, while restricted regions can limit that interaction. This relationship links physical chromatin organization to regulatory activity. Comparing accessible regions across cells or conditions can therefore help identify candidate promoters and enhancers involved in cell-type-specific patterns of gene expression.
ATAC-seq provides a genome-wide profile of regions where chromatin is accessible. Researchers can use these profiles to locate candidate promoters and enhancers and to compare chromatin states across samples. The resulting maps do not simply describe DNA sequence; they show how regulatory availability is distributed across the genome and can be related to gene expression.
Different cell types can display distinct accessible genomic regions, helping explain why they activate different sets of genes despite sharing the same genome. Comparing these patterns identifies regulatory elements associated with cell identity and specialized functions. Such analyses are especially useful for studying cell differentiation and the regulatory changes that accompany development.
Accessibility profiling is useful when researchers need to follow changes in chromatin regulation during development, differentiation, disease, or environmental response. It can reveal regulatory regions whose availability changes between biological states. Combining these profiles with gene-expression information helps investigate whether altered chromatin organization may contribute to broader changes in cellular function.
Measurements of accessible chromatin provide evidence about which regulatory regions are physically available when gene activity changes. Researchers can use this information to connect candidate promoters or enhancers with altered regulatory states, rather than considering expression differences alone. In biology, this supports interpretation of how chromatin organization contributes to cell-specific or condition-dependent gene regulation.