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DNA Microarrays02:34

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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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In situ hybridization (ISH) is a technique used to detect and localize specific DNA or RNA molecules in cells, tissue, or tissue sections using a labeled probe. The technique was first used in 1969 for the investigation of nucleic acids. It is currently an essential tool in scientific research and clinical settings, especially for diagnostic purposes.
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DNA Microarrays: Sample Quality Control, Array Hybridization and Scanning
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[A possibility to use the DNA-based probes as internal standards for Agilent Technologies microarray transcriptomic

L K Kurbatov1, V G Zgoda1

  • 1Institute of Biomedical Chemistry, Moscow, Russia.

Biomeditsinskaia Khimiia
|December 28, 2016
PubMed
Summary

This study introduces a novel, stable, and easily manufactured DNA-based template for synthesizing fluorescently labeled RNA. This method enhances microarray accuracy by providing a reliable internal standard for gene expression analysis.

Keywords:
T7-promoterfluorescence levellabeled cRNAmicroarraysplasmid DNA

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biotechnology

Background:

  • Microarray technology relies on multi-stage normalization for accurate gene expression analysis.
  • Internal standards are crucial for normalization, with current protocols using Spike-In Kits or in vitro synthesized RNA probes.
  • Existing RNA-based standards suffer from production difficulties and low stability.

Purpose of the Study:

  • To develop a more stable, accessible, and reliable internal standard for microarray-based gene expression analysis.
  • To investigate the feasibility of using DNA sequences with a T7 promoter as a template for synthesizing labeled RNA.
  • To compare the performance of the novel DNA-based standard against conventional RNA-based controls.

Main Methods:

  • Utilized plasmid DNA containing various genes downstream of a T7 promoter.
  • Synthesized fluorescently labeled RNA (cRNA) in vitro using the DNA sequences as templates.
  • Compared the stability, ease of production, and scalability of the DNA-based template system with existing RNA standards.

Main Results:

  • Successfully synthesized fluorescently labeled RNA sequences from DNA templates containing a T7 promoter.
  • Demonstrated that this DNA-templated RNA synthesis system is a reliable method for generating internal standards.
  • The novel DNA-based template is significantly more stable, easier to produce, and available in larger quantities than traditional RNA probes.

Conclusions:

  • A novel DNA-templated RNA synthesis method offers a superior alternative to current internal standards for microarray analysis.
  • This approach enhances the reliability and practicality of gene expression studies.
  • The developed system provides a stable, cost-effective, and scalable solution for generating labeled RNA controls.