Lateral Dna Loops
Lateral Dna Loops - Related Videos
11:27
Studying DNA Looping by Single-Molecule FRET
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Cited by 13 •
2014
This study presents a detailed experimental procedure to measure looping dynamics of double-stranded DNA using single-molecule Fluorescence Resonance Energy Transfer (FRET). The protocol also describes how to extract the looping probability density called the J factor.
17:15
Catheterization of Intestinal Loops in Ruminants
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Cited by 4 •
2009
We describe a novel surgical method for catheterizing 'intestinal loops' within the ileum of sheep. Once animals have recovered from surgery and have cleared antibiotics and analgesics, multiple treatments can be deposited directly in loops via the catheters.
09:15
Measuring Pressure Volume Loops in the Mouse
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Cited by 16 •
2016
This manuscript describes a detailed protocol for the collection of pressure-volume data from the mouse.
07:11
Sampling Blood from the Lateral Tail Vein of the Rat
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Cited by 82 •
2015
Blood samples are useful for assessing biomarkers of physiological states or disease in vivo. Here we describe the methodology to sample blood from the lateral tail vein in the rat. This method provides rapid samples with minimal pain and invasiveness.
02:48
Loop-Mediated Isothermal Amplification for Bacterial Gene Detection
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2025
Source: Domesle, K. J., et al. Loop-Mediated Isothermal Amplification for Screening Salmonella in Animal Food and Confirming Salmonella from Culture Isolation. J. Vis. Exp. (2020).This video demonstrates the loop-mediated isothermal amplification (LAMP) technique for detecting a target bacterial gene by amplifying DNA at a constant temperature. The reaction mixture is prepared by adding an isothermal master mix, specific primers for the target gene, and samples containing DNA templates. The...
FAQs
The central chromosome axis provides the structural reference from which the loops extend, allowing active transcription to be viewed in relation to chromosome organization. This arrangement links a gene’s exposed, locally unwound DNA with its position on the chromosome. Consequently, lateral DNA loops let investigators examine how large-scale architecture accompanies transcription rather than treating gene activity as an isolated molecular event.
Local unwinding makes the DNA template accessible to RNA polymerase and transcription factors. Their access helps explain why the loops appear as sites of active gene expression: the structure reflects a temporary, functionally open state rather than simply a passive extension of chromatin. Observing this relationship gives researchers a cytological way to connect physical DNA exposure with RNA production.
RNA produced during transcription, together with ribonucleoprotein particles, accumulates along the loop. This accumulation provides visible evidence that transcription is occurring and associates the extended structure with its products. Researchers can therefore interpret loop morphology alongside RNA localization, gaining more information than chromosome shape alone would provide when analyzing the relationship between transcription and chromatin.
Growing oocytes produce RNA intensely, and that high transcriptional activity makes their lampbrush chromosomes particularly useful for observing loop-associated processes. The resulting material supports later developmental stages, so these cells connect chromosome-level transcription with a biologically important developmental context. Studying them helps investigators ask how active genome organization may support the RNA requirements of oocyte growth.
Researchers can compare visible chromosome architecture with the distribution of transcription-related features, including locally exposed DNA, newly synthesized RNA, and ribonucleoprotein particles. This combined view reveals that genome organization and gene regulation are linked rather than independent topics. As a cytological model, lateral DNA loops make that relationship accessible through direct cellular observation.
A study can focus on lampbrush chromosomes, identify looped fibers projecting from their axis, and then assess local DNA unwinding together with associated RNA and ribonucleoprotein particles. Interpreting these features in the oocyte context connects structure to transcriptional activity. This approach supplies cellular-scale evidence for how genome organization may influence gene regulation.