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Fiberoptic DNA sensor array capable of detecting point mutations

B G Healey1, R S Matson, D R Walt

  • 1The Max Tishler Laboratory for Organic Chemistry, Tufts University, Medford, Massachusetts 02155, USA.

Analytical Biochemistry
|September 23, 1997
PubMed
Summary
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This study introduces a novel fiberoptic DNA sensor array for simultaneous detection of multiple DNA hybridization events. The sensor array demonstrates high sensitivity and the ability to accurately identify point mutations, offering a significant advancement in biosensing technology.

Area of Science:

  • Biotechnology
  • Molecular Biology
  • Sensor Technology

Background:

  • Developing sensitive and simultaneous DNA detection methods is crucial for genetic analysis.
  • Existing DNA biosensors have limitations in detection limits and multiplexing capabilities.

Purpose of the Study:

  • To develop and characterize the first integrated fiberoptic DNA sensor array for simultaneous monitoring of multiple hybridization events.
  • To demonstrate the array's capability in detecting and discriminating point mutations in DNA.

Main Methods:

  • Covalent immobilization of 5'-amino-terminal DNA probes onto acrylamide-based polymer matrices.
  • Fabrication of DNA sensor arrays with specific oligonucleotide probes (p(dA)(18-mer), H-ras wild-type, H-ras mutant).
  • Real-time monitoring of 5'-fluorescein isothiocyanate (FITC)-labeled target oligonucleotide hybridization using the fiberoptic array.

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Main Results:

  • The sensor array successfully monitored real-time hybridization events simultaneously.
  • Demonstrated ability to distinguish point mutations, with a 13°C decrease in melting temperature (Tm) for a single-base mismatch.
  • Achieved a lower detection limit approximately one order of magnitude better than previously reported DNA biosensors, detecting concentrations from 0.2-196 nM.
  • Successfully identified a point mutation in a PCR product of the H-ras oncogene.

Conclusions:

  • The developed fiberoptic DNA sensor array is highly sensitive and capable of discriminating point mutations.
  • The array has potential for submicroliter volume sampling due to its small array element volumes (20 pL).
  • This technology represents a significant advancement for real-time, multiplexed DNA analysis and mutation detection.