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Gonyautoxin 1/4 aptamers with high-affinity and high-specificity: From efficient selection to aptasensor application.

Shunxiang Gao1, Bo Hu2, Xin Zheng3

  • 1Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Second Military Medical University, Shanghai 200433, China.

Biosensors & Bioelectronics
|January 24, 2016
PubMed
Summary
This summary is machine-generated.

A novel aptasensor was developed for detecting Gonyautoxin 1/4 (GTX1/4), a potent marine neurotoxin. This biosensor offers a sensitive, specific, and rapid alternative for monitoring paralytic shellfish toxins in seafood.

Keywords:
AptasensorBiolayer interferometryIn vitro selectionOptimization

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Area of Science:

  • Marine Biology
  • Biotechnology
  • Analytical Chemistry

Background:

  • Gonyautoxin 1/4 (GTX1/4) are potent marine neurotoxins posing significant public health risks.
  • Existing detection methods for GTX1/4 face ethical and technical challenges, necessitating alternative approaches for regulatory monitoring.

Purpose of the Study:

  • To develop and characterize a high-affinity aptamer specific for GTX1/4.
  • To construct a label-free, real-time optical aptasensor for GTX1/4 detection.
  • To evaluate the aptasensor's performance in terms of sensitivity, specificity, and application in real samples.

Main Methods:

  • Selection and optimization of a GTX1/4-specific aptamer using the advanced GO-SELEX screening technology.
  • Truncation of the aptamer to identify a core sequence with high affinity (Kd of 17.7 nM).
  • Construction of a label-free optical biolayer interferometry (BLI) aptasensor using the optimized aptamer.

Main Results:

  • The aptasensor demonstrated a broad detection range (0.2–200 ng/mL) and a low limit of detection (50 pg/mL) for GTX1/4.
  • High specificity for GTX1/4 was observed, with no cross-reactivity to other marine toxins.
  • The aptasensor successfully detected GTX1/4 in spiked shellfish samples, showing good reproducibility and stability.

Conclusions:

  • A novel aptamer-based optical biosensor provides a promising alternative for the rapid and accurate detection of the marine biotoxin GTX1/4.
  • The developed aptasensor addresses limitations of traditional methods, offering improved sensitivity and specificity for regulatory monitoring.
  • This technology has the potential to enhance food safety by enabling efficient detection of paralytic shellfish toxins.