Dna Double-strand Breaks
Dna Double-strand Breaks - Related Videos
02:04
Fixing Double-strand Breaks
0 Views •
2020
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
02:04
Fixing Double-strand Breaks
0 Views •
2023
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
05:23
Immunofluorescence Microscopy for the Analysis of DNA Double-Strand Breaks
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2025
In this video, we describe the immunofluorescence microscopy technique to detect specific DNA damage response proteins localized at the sites of DNA double-strand breaks in human mononuclear cells. The proteins are recognized by specific primary antibodies, which in turn bind to fluorophore-tagged secondary antibodies that fluoresce during microscopic visualization, enabling visualization of the proteins as distinct fluorescent foci within the cell nuclei.
13:10
Analysis of DNA Double-strand Break (DSB) Repair in Mammalian Cells
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Cited by 116 •
2010
This article describes GFP-based fluorescence in vivo assays that separately quantify homologous recombination and nonhomologous end joining in mammalian cells.
07:46
Detection of DNA Double-Stranded Breaks in Mouse Oocytes
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Cited by 2 •
2023
Maintaining oocyte genome integrity is necessary to ensure the genetic fidelity in the resulting embryo. Here, we present an accurate protocol for detecting DNA double-strand breaks in mammalian female germ cells.
FAQs
After a break forms, damage-sensing pathways signal the lesion and activate cell-cycle checkpoints. These checkpoints provide time for repair before normal cell-cycle progression continues. The response therefore links lesion recognition with temporary control of cellular proliferation. In biology, this connection is important because repair must occur before the damaged genome is propagated.
Non-homologous end joining reconnects DNA ends directly, whereas homologous recombination restores a break using a matching DNA template. This distinction makes the pathways scientifically useful for comparison: one represents direct end joining, while the other supports more accurate restoration through sequence correspondence. Examining both helps explain how cells resolve the same lesion through different repair strategies.
Sources such as ionizing radiation, replication stress, and programmed cellular processes create different biological contexts for the same repair challenge. Regardless of origin, unresolved or incorrectly restored breaks can contribute to mutations and chromosomal rearrangements. These outcomes connect break formation with genome instability, making the lesions relevant not only to cellular maintenance but also to disease research.
At a conceptual level, investigating a break follows the cell's response from lesion recognition to checkpoint activation and repair-pathway analysis. A study can then ask whether direct end joining or template-based restoration best accounts for the observed outcome. This framework allows researchers to connect a break-inducing condition with repair behavior and resulting mutations or chromosomal rearrangements.
Engineered DNA double-strand breaks create a defined entry point for studying repair rather than relying only on naturally arising damage. In genome editing, such breaks can support targeted genetic change; in functional genetics, they help investigate gene roles; and in DNA-repair studies, they provide a context for examining how repair pathways respond to a controlled lesion.
Biology uses these lesions to connect molecular repair with disease mechanisms. Studying how cells respond can clarify how mutations and chromosomal rearrangements arise, while also helping explain how cancer develops. The same research distinguishes ordinary damage responses from deliberately engineered breaks, showing how one biological process supports both genome-maintenance studies and experimental manipulation.