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DNA Microarrays

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

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Visual Detection of Multiple Nucleic Acids in a Capillary Array

Visual Detection of Multiple Nucleic Acids in a Capillary Array

Published on: November 15, 2017

Detection of single-base mutations using 1-D microfluidic beads array.

He Zhang¹, Xiaohai Yang, Kemin Wang

¹State Key Laboratory of Chemo/Biosensing & Chemometrics, Biomedical Engineering Center, College of Chemistry & Chemical Engineering, Hunan University, Changsha, Hunan, PR China.

Electrophoresis

|December 12, 2007

Summary

This study introduces a microfluidic beads array for rapid, label-free detection of single-base mutations in the p53 gene. The platform offers high sensitivity and reusability for accurate cancer mutation analysis.

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Area of Science:

Biotechnology
Molecular Biology
Genetics

Background:

Single-base mutations in genes like p53 are crucial in cancer development.
Existing mutation detection methods often require sample labeling and PCR amplification, increasing complexity and cost.

Purpose of the Study:

To develop and demonstrate a novel 1-D microfluidic beads array for sensitive and specific detection of single-nucleotide mutations.
To analyze mutations in the human p53 tumor suppressor gene without sample labeling or amplification.

Main Methods:

Utilized individually addressable functionalized SiO2 beads in a 1-D microfluidic array.
Employed a "sandwich" hybridization assay for mutation detection.
Used a microinjection system for selective linear arraying of beads within microfluidic channels.

Main Results:

Achieved sensitive identification of single-nucleotide mutations in 40 pM DNA targets.
Demonstrated discrimination of one mutant allele in 100 wild-type sequences.
Successfully genotyped p53 from cell line mRNA extracts without labeling or amplification.

Conclusions:

The 1-D microfluidic beads array platform enables rapid, accurate gene mutation discrimination.
The system offers advantages including reusability, low sample volume, room temperature operation, and cost-effectiveness.