Dna Stretching
Dna Stretching - Related Videos
08:48
Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
0 Views •
Cited by 5 •
2011
We illustrate the use of a constant force axial optical tweezers to explore the mechanical properties of short DNA molecules. By stretching DNA axially, we minimize steric hindrances and artifacts arising in conventional lateral manipulation, allowing us to study DNA molecules as short as ~100 nm.
17:03
Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay
0 Views •
Cited by 13 •
2010
We describe a method for observing real time replication of individual DNA molecules mediated by proteins of the bacteriophage replication system.
12:05
A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
0 Views •
Cited by 8 •
2017
This protocol demonstrates a simple, robust and high throughput single molecule flow-stretching assay for studying one-dimensional (1D) diffusion of molecules along DNA.
07:42
Live Cell Imaging during Mechanical Stretch
0 Views •
Cited by 12 •
2015
A novel imaging protocol was developed using a custom motor-driven mechanical actuator to allow the measurement of real time responses to mechanical strain in live cells. Relevant to mechanobiology, the system can apply strains up to 20% while allowing near real-time imaging with confocal or atomic force microscopy.
09:41
Stretching Micropatterned Cells on a PDMS Membrane
0 Views •
Cited by 6 •
2014
This manuscript presents a technique to apply or release forces on adherent cells or tissues using unidirectional stretching.
FAQs
The central challenge is DNA’s natural coiled structure, which hides length and positional information. Surface attachment, fluid flow, and confinement in microfluidic or nanofluidic channels provide physical constraints or forces that extend the strand. This altered configuration produces a more ordered molecule, making its length, organization, and sequence-related features accessible to imaging or other measurements.
Fluorescent labels or other labeling approaches help convert the elongated strand into a visible signal that can be examined along its length. They can reveal where DNA features or associated molecules appear relative to the ordered molecule. This readout supports measurements of length and organization while enabling analysis of sequence-related features and DNA–protein interactions.
Multiple stretching strategies address the same structural problem through different physical arrangements. Surface attachment anchors DNA, whereas fluid flow or confinement in microfluidic and nanofluidic channels acts on the molecule without relying on the same anchoring arrangement. These options provide alternative formats for producing spatial order, imaging individual strands, or integrating analysis into compact systems.
A typical workflow begins by introducing DNA into a format that can extend it, such as an attached surface or a microfluidic or nanofluidic channel. Flow or confinement can help produce an elongated arrangement. Researchers then use fluorescence imaging or another labeling-based readout to examine length, organization, sequence-related features, or molecular associations.
Genome mapping is a major application because spatially ordered strands make genomic features easier to compare along DNA length. The same measurements can be used to examine DNA–protein interactions and characterize molecular behavior. In bioengineering, these capabilities support tools for analyzing genomic structure and molecular organization at the single-molecule level.
DNA stretching is relevant to bioengineering because its imaging-compatible formats can be incorporated into miniaturized diagnostic platforms. Microfluidic and nanofluidic channels also create a path toward high-throughput genomic analysis, where measurements can be organized in compact systems. These applications link molecular-scale information to practical analytical device development and genomic structure characterization.