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Related Concept Videos

DNA Microarrays02:34

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Probe-based Real-time PCR Approaches for Quantitative Measurement of microRNAs
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Highly Sensitive and Quantitative Detection of microRNA-21 in Cells Using Bipedal DNA Walker-Based Ratiometric

Wenting Wei1, Han Lin2, Kuniharu Ijiro2

  • 1Graduate School of Life Science, Hokkaido UniversityKita 10, Nishi 8, Kita-Ku, Sapporo 060-0810, Japan.

Analytical Chemistry
|October 21, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel DNA walker system for precise microRNA (miRNA) detection. The innovative design corrects for environmental changes, enhancing accuracy in complex biological samples for cancer biomarker research.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Nanotechnology

Background:

  • Accurate microRNA (miRNA) detection is crucial for identifying cancer biomarkers.
  • Environmental fluctuations in cells can hinder sensitive miRNA detection methods.
  • Existing DNA walker strategies face challenges with cellular microenvironment variability.

Purpose of the Study:

  • To develop a robust DNA walker system for accurate and sensitive miRNA detection.
  • To overcome limitations posed by environmental variations in biological samples.
  • To enable precise quantification of intracellular miRNA levels.

Main Methods:

  • Designed a symmetric bipedal DNA walker with a signal-generating leg and a reference leg.
  • Integrated a dynamic, environment-responsive internal reference signal.
  • Utilized ratiometric fluorescence and gold nanoparticles with an inverted hairpin scaffold.
  • Employed confocal ratiometric fluorescence imaging for intracellular analysis.

Main Results:

  • The DNA walker system demonstrated high sensitivity and accuracy in detecting low-abundance miRNAs.
  • The synchronized internal reference effectively corrected for environmental fluctuations and system errors.
  • Ratiometric fluorescence compensation minimized variations from nanoparticle loading and strand assembly.
  • Achieved high-contrast quantification of intracellular miR-21 across different cell lines.
  • Revealed heterogeneous subcellular distribution of miR-21.

Conclusions:

  • The developed DNA walker platform provides a reliable method for precise miRNA quantification in complex biological environments.
  • This approach enhances detection accuracy and reproducibility, crucial for biomarker discovery.
  • Spatially resolved imaging offers insights into miRNA subcellular localization and function.