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Updated: Jun 23, 2026

Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis
Published on: July 8, 2025
Fluorescence detection of single-nucleotide polymorphisms with a single, self-complementary, triple-stem DNA probe
Yi Xiao1, Kory J I Plakos, Xinhui Lou
1Materials Department, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
This study introduces a novel, single-step DNA sensor for detecting single-nucleotide polymorphisms (SNPs) at room temperature. The innovative sensor utilizes a unique DNA structure that significantly enhances fluorescence upon binding to target sequences.
Area of Science:
- Molecular Biology
- Biotechnology
- Genetics
Background:
- Single-nucleotide polymorphisms (SNPs) are crucial genetic variations.
- Accurate and efficient SNP detection methods are vital for diagnostics and research.
- Existing methods can be complex, time-consuming, or require specific temperature control.
Purpose of the Study:
- To develop a simplified, highly sensitive fluorescence-based method for SNP detection.
- To create a single-component sensor for room-temperature operation.
- To demonstrate the sensor's effectiveness in distinguishing perfectly matched targets.
Main Methods:
- Design of a single, self-complementary DNA strand forming a triple-stem structure.
- Utilizing a fluorescence-based assay for signal detection.
- Performing detection at room temperature without complex thermal cycling.
Main Results:
- The DNA sensor operates in a single step with a single component.
- A significant increase in fluorescence is observed upon binding to perfectly matched (PM) targets.
- The conformational change of the DNA structure is directly linked to target binding and fluorescence output.
Conclusions:
- This novel DNA sensor offers a simple, efficient, and room-temperature method for SNP detection.
- The single-component, fluorescence-based approach provides a sensitive platform for genetic analysis.
- The sensor's design demonstrates a unique mechanism for conformational change-driven signal amplification.
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