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Related Experiment Video

Updated: Jul 1, 2026

gDNA Enrichment by a Transposase-based Technology for NGS Analysis of the Whole Sequence of BRCA1, BRCA2, and 9 Genes Involved in DNA Damage Repair
08:15

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Real-time detection of BRCA1 gene mutations using a monolithic silicon optocoupler array.

Elissavet Mavrogiannopoulou1, Panagiota S Petrou, Sotirios E Kakabakos

  • 1Immunoassay/Immunosensors Lab., I./R.-R.P., N.C.S.R. "Demokritos", GR-15310 Aghia Paraskevi, Greece.

Biosensors & Bioelectronics
|September 16, 2008
PubMed
Summary

This study introduces a silicon optocoupler for real-time detection of BRCA1 gene mutations linked to hereditary breast and ovarian cancer. The device achieves high sensitivity, enabling improved discrimination between wild-type and mutant sequences for potential point-of-care diagnostics.

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Area of Science:

  • Optoelectronics
  • Molecular Diagnostics
  • Biotechnology

Background:

  • Hereditary breast and ovarian cancer are often linked to BRCA1 gene mutations.
  • Accurate and rapid detection of these mutations is crucial for risk assessment and personalized medicine.
  • Existing diagnostic methods can be time-consuming and require specialized laboratory equipment.

Purpose of the Study:

  • To develop a novel monolithic silicon optocoupler for sensitive and real-time genetic mutation detection.
  • To demonstrate the optocoupler's capability in identifying common BRCA1 gene mutations.
  • To establish a platform for integrated, low-cost biosensing devices.

Main Methods:

  • Immobilization of wild-type and mutant BRCA1 gene-specific oligonucleotides onto silicon optocouplers.
  • Real-time monitoring of hybridization with fluorescently labeled complementary sequences.
  • Utilizing AlexaFluor 647 dye for fluorescence labeling and measuring changes in optocoupler efficiency.
  • Analyzing real-time dehybridization kinetics for sequence discrimination.

Main Results:

  • The silicon optocoupler successfully detected BRCA1 gene mutations in real-time.
  • A detection limit of 0.9 nM (9 fmol) was achieved using AlexaFluor 647.
  • Real-time dehybridization monitoring significantly improved discrimination between wild-type and mutant sequences.
  • The device demonstrated concentration-dependent modulation of optocoupler efficiency upon hybridization.

Conclusions:

  • The developed monolithic silicon optocoupler provides a versatile platform for next-generation integrated biosensors.
  • This technology enables sensitive and specific detection of genetic mutations, applicable to hereditary cancer predisposition.
  • The potential for dense array fabrication on a single chip paves the way for advanced point-of-care diagnostic microsystems.