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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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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Related Experiment Video

Updated: May 14, 2025

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
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Electron Perturbation for Chiral DNA Point Mutation.

Juyong Gwak1, Yehree Kim2, Se Jeong Park1

  • 1Department of Chemistry, Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea.

ACS Nano
|April 11, 2025
PubMed
Summary
This summary is machine-generated.

A novel plasmonic nematic film (PNF) detects DNA mutations by amplifying nanoscale plasmonic hotspots. This biosensing platform offers highly specific mutation diagnostics with significant signal enhancement.

Keywords:
DNA-plasmonics interactionschiral optical responseclinical DNA biosensorelectron perturbationmutation-induced signal amplification

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Area of Science:

  • Molecular nanotechnology
  • Plasmonics
  • Chiroptics

Background:

  • Nanoscale interactions are crucial for advanced biosensing and diagnostics.
  • Plasmonic nematic films (PNFs) offer potential for signal amplification in biosensing.

Purpose of the Study:

  • To develop a PNF-based system for sensitive and specific detection of DNA mutations.
  • To investigate the mechanism of mutation detection using chiroptical spectral shifts.

Main Methods:

  • Utilized a plasmonic nematic film (PNF) to detect DNA mutations via circular dichroism (CD) spectral shifts.
  • Correlated spectral shifts (Δλdip) with target DNA concentration and analyzed the underlying electromagnetic field enhancements.
  • Employed simulations and electric field analysis to validate the detection mechanism.

Main Results:

  • PNF detected sequence-specific DNA mismatches, particularly point mutations, with high sensitivity (down to 1534 pg).
  • Observed a strong correlation (R2 > 0.99) between spectral shifts and DNA concentration, enabling quantitative detection.
  • Achieved over 240% enhancement in chiroptical signal compared to wild-type DNA, confirming mutation-induced asymmetry amplification.

Conclusions:

  • The PNF platform demonstrates high specificity and sensitivity for detecting clinically relevant DNA mutations.
  • The findings support the development of novel chiral biosensing platforms for molecular diagnostics.
  • This technology holds promise for diagnosing conditions like hereditary hearing impairment.