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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.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Microprobes for Label-Free Detection of Short Tandem Repeats: An Insight into Alleviating Secondary Structure

Omair Adil1, Seth B Eddington2, Keith T Gagnon1,2

  • 1School of Chemical and Biomolecular Sciences, 1245 Lincoln Dr, Southern Illinois University at Carbondale, Carbondale, Illinois 62901, United States.

Analytical Chemistry
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Lock-nucleic acid (LNA) microprobes offer a novel method for detecting gene expansions linked to neurodegenerative disorders. This approach specifically identifies tandem repeats, overcoming challenges posed by secondary structures and improving diagnostic accuracy.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biosensor Technology

Background:

  • Overgrowth of short tandem repeats (STRs) in genes is implicated in neurodegenerative disorders.
  • Label-free electrochemical detection of STR expansions is challenging due to secondary structures and sporadic repeats, which can cause false positives.
  • Developing specific detection platforms for STRs is crucial for diagnosing genetic neurodegenerative diseases.

Purpose of the Study:

  • To analyze DNA, peptide nucleic acid (PNA), and lock-nucleic acid (LNA) microprobe backbones for detecting CAG repeat expansions in RNA.
  • To evaluate the microprobes' ability to distinguish STR lengths and mitigate interference from secondary structures and sporadic repeats.
  • To assess the influence of Mg2+ on the detection performance.

Main Methods:

  • Comparative analysis of DNA, PNA, and LNA microprobes for detecting in vitro transcribed RNA with CAG repeats.
  • Electrochemical detection based on charge-transfer resistance at the interface.
  • Control experiments with and without Mg2+ to evaluate performance.

Main Results:

  • LNA microprobes demonstrated superior performance in distinguishing CAG repeat lengths down to the attomolar level.
  • LNA microprobes effectively alleviated interference from secondary structures and sporadic repeats, enhancing specificity for tandem repeats.
  • Detection performance of LNA microprobes was improved in the presence of Mg2+.

Conclusions:

  • LNA-based microprobes show significant potential for specific and sensitive detection of STR expansions associated with genetic neurodegenerative disorders.
  • The developed platform offers a reliable and straightforward approach for biosensing applications.
  • Further development could lead to advanced diagnostic tools for diseases like Huntington's disease.