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A comparison of methods for DNA preparation prior to microarray analysis.

Chris R Taitt1, Tomasz A Leski1, Sophie M Colston2

  • 1Center for BioMolecular Science & Engineering, US Naval Research Laboratory, Washington, DC, USA.

Analytical Biochemistry
|August 26, 2019
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Optimizing microarray analysis for pathogens involves effective fragmentation and labeling of amplified DNA. Nick translation and Klenow fragment labeling offer superior sensitivity and specificity for whole genome amplification compared to end labeling methods.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Microarrays are essential for analyzing nucleic acids in bacteria and eukaryotes.
  • Non-specific amplification is often used, necessitating optimized fragmentation and labeling for microarray accuracy.

Purpose of the Study:

  • To evaluate different whole genome amplicon fragmentation and labeling methods for microarray analysis.
  • To determine the impact of these methods on sensitivity and specificity using ESKAPE pathogens.

Main Methods:

  • Compared two fragmentation methods (DNase I, sonication) and three labeling methods (Universal Labeling System, Klenow fragment/random primer, nick translation).
  • Assessed microarray performance, including sensitivity and specificity, for eight sequenced ESKAPE pathogens.

Main Results:

  • End labeling methods showed poor performance, failing to detect numerous genes.
  • Nick translation and Klenow fragment/random primer labeling provided good sensitivity and selectivity.
  • Nick translation achieved 91-100% sensitivity and 100% specificity, with faster processing times.

Conclusions:

  • Nick translation and Klenow fragment labeling are effective for whole genome amplicon processing in microarrays.
  • These methods significantly improve sensitivity and specificity compared to end labeling.
  • Optimized sample processing protocols can be completed in under 10 hours.