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DNA Microarrays02:34

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Related Experiment Video

Updated: Jul 10, 2026

Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
11:25

Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications

Published on: April 21, 2016

Nanowire-transistor based ultra-sensitive DNA methylation detection.

Wusi C Maki1, Nirankar N Mishra, Eric G Cameron

  • 1Center for Advanced Microelectronics and Biomolecular Research, University of Idaho, Post Falls, Idaho, USA.

Biosensors & Bioelectronics
|October 16, 2007
PubMed
Summary

This study introduces a novel nanowire field-effect transistor (FET) biosensor for simple, ultra-sensitive DNA methylation detection. This technology avoids complex procedures, enabling early tumor suppressor gene analysis.

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Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
06:07

Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors

Published on: August 5, 2022

Area of Science:

  • Biotechnology
  • Nanotechnology
  • Epigenetics

Background:

  • DNA methylation is crucial for gene regulation and implicated in tumor suppressor gene silencing.
  • Current DNA methylation detection methods are complex and time-consuming.
  • Accurate detection is vital for identifying tumor formation risks.

Purpose of the Study:

  • To develop a simple, ultra-sensitive, and cost-effective biosensor for DNA methylation detection.
  • To utilize nanowire field-effect transistor (FET) technology for electronic detection.
  • To target the promoter of the p16(INK) tumor suppressor gene.

Main Methods:

  • A nanowire FET-based biosensor was developed.
  • Magnetic beads were used for target DNA capture and concentration.
  • Monoclonal anti-5-methylcytosine antibodies immobilized on the nano-FET detected methylated DNA.
  • Electronic charge changes in the nano-transistor generated detectable signals.

Main Results:

  • The developed nano-FET biosensor achieved simple and ultra-sensitive electronic DNA methylation detection.
  • The system successfully detected methylated p16(INK) promoter DNA.
  • Detection sensitivity reached 2.5 x 10(-19) mol with no observed false positives.
  • The method avoided bisulfite treatment and PCR amplification.

Conclusions:

  • The nanowire FET biosensor offers a promising, simplified approach for sensitive DNA methylation detection.
  • This technology has the potential for early cancer risk identification through epigenetic alteration analysis.
  • The low-cost, ultra-sensitive nature of the biosensor facilitates broader application in diagnostics.