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Labeling DNA Probes

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection

Published on: February 9, 2024

Prototropically Allosteric Probe for Superbly Selective DNA Analysis.

Fan Lin¹, Yufeng Zhou¹, Qiusha Li¹

¹Institute of Physical Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University , Jinhua 321004, Zhejiang, China.

Analytical Chemistry

|July 26, 2017

Summary

This summary is machine-generated.

This study introduces a novel (trihydroxyphenyl)porphyrin probe for highly selective DNA sensing. It enables precise detection of single-nucleotide polymorphisms by utilizing a unique prototropic allosteric mechanism for biosensor development.

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Area of Science:

Biochemistry and Molecular Biology
Chemical Biology
Biosensor Technology

Background:

Developing selective biosensors requires probes that bind specific DNA sequences without interference from surrounding bases.
Existing methods often struggle with selectivity due to flanking DNA sequences, limiting their application in diagnostics.

Purpose of the Study:

To synthesize and characterize a dual-function porphyrin probe for targeting abasic sites in DNA.
To investigate the prototropic allosteric mechanism for achieving high selectivity in single-nucleotide polymorphism (SNP) analysis.

Main Methods:

Synthesis of a (trihydroxyphenyl)porphyrin (POH3) probe with a recognition unit (RU) and a signal unit (SU).
Utilizing pH-dependent conformational changes and hydrogen bonding interactions for nucleotide recognition.
Assessing probe fluorescence response to different DNA sequences and flanking bases.

Main Results:

The POH3 probe selectively binds to abasic sites, with fluorescence turn-on only occurring opposite cytosine.
Prototropic allostery between the RU and SU confers superb selectivity for SNP analysis, distinguishing cytosine from other bases.
The probe demonstrates tolerance to flanking guanine bases, a significant improvement over previous DNA sensing technologies.

Conclusions:

The developed prototropically allosteric porphyrin probe offers a highly selective and robust method for DNA-based sensing.
This approach, combining abasic site targeting with allosteric signaling, shows great promise for applications in biosensors and diagnostics.