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Related Concept Videos

Overview of DNA Repair02:25

Overview of DNA Repair

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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Using Next Generation Sequencing to Identify Mutations Associated with Repair of a CAS9-induced Double Strand Break Near the CD4 Promoter
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A novel DNA damage detection method based on a distinct DNA damage response system.

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Researchers developed a new in vitro method to detect DNA damage using fluorescence resonance energy transfer (FRET). This technique quantifies single-stranded DNA (ssDNA) levels, a key indicator of cellular stress and damage.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • DNA damage arises from various environmental and internal cellular stresses.
  • Single-stranded DNA (ssDNA) is a critical signaling molecule in DNA damage response pathways.
  • The Deinococcus PprI protein's ability to bind ssDNA and cleave DdrO protein is crucial for radiation resistance.

Purpose of the Study:

  • To develop a quantitative in vitro method for detecting DNA damage.
  • To leverage the ssDNA-binding property of PprI and its interaction with DdrO for damage detection.
  • To establish a fluorescence resonance energy transfer (FRET)-based assay for ssDNA quantification.

Main Methods:

  • Engineered a DdrO protein construct with N-terminal eYFP and C-terminal eCFP fusion proteins.
  • Utilized FRET efficiency between eYFP and eCFP as a readout for DdrO cleavage.
  • Developed a standard curve correlating FRET efficiency with ssDNA concentration.

Main Results:

  • Demonstrated that FRET efficiency directly reflects DdrO cleavage, which is dependent on ssDNA presence.
  • Successfully constructed a standard curve for quantifying ssDNA concentrations.
  • Validated the method's effectiveness through application examples.

Conclusions:

  • The developed FRET-based assay provides a sensitive and quantitative method for detecting DNA damage in vitro.
  • This assay can accurately measure ssDNA concentrations, serving as a reliable biomarker for DNA damage.
  • The findings offer a valuable tool for research in DNA repair, radiation biology, and genotoxicity testing.