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Related Concept Videos

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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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Determining Genetic Expression Profiles in C. elegans Using Microarray and Real-time PCR
10:27

Determining Genetic Expression Profiles in C. elegans Using Microarray and Real-time PCR

Published on: July 30, 2011

Complementary RNA amplification methods enhance microarray identification of transcripts expressed in the C. elegans

Joseph D Watson1, Shenglong Wang, Stephen E Von Stetina

  • 1Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232-8240, USA. joseph.watson@vanderbilt.edu

BMC Genomics
|February 21, 2008
PubMed
Summary

Comparing RNA amplification methods for C. elegans gene expression profiling, this study found that both WT-Ovation Pico (WT-Pico) and In Vitro Transcription (IVT) yield valid microarray data. Combining both methods identifies more neural-enriched transcripts than either alone.

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Genomics

Background:

  • DNA microarrays enable global gene expression analysis.
  • Limited mRNA in specific cell types necessitates RNA amplification for microarray studies.
  • Profiling gene expression in the C. elegans larval nervous system requires efficient RNA amplification.

Purpose of the Study:

  • To compare two RNA amplification methods for microarray analysis of C. elegans larval nervous system gene expression.
  • To evaluate the effectiveness of WT-Ovation Pico (WT-Pico) and In Vitro Transcription (IVT) in identifying neuron-specific transcripts.
  • To determine the optimal amplification strategy for limited RNA samples.

Main Methods:

  • Isolated transcripts from C. elegans larval neurons using an mRNA-tagging strategy.
  • Amplified pan-neural RNA using WT-Ovation Pico (2 ng) and In Vitro Transcription (25 ng).
  • Generated labeled cDNA and aRNA for microarray analysis and compared results.

Main Results:

  • WT-Ovation Pico (WT-Pico) yielded a higher fraction of present calls compared to In Vitro Transcription (IVT).
  • Both methods identified a combined total of 2,173 unique neuron-enriched transcripts.
  • Only 1,044 transcripts were detected as enriched by both WT-Pico and IVT, highlighting method-specific detection.

Conclusions:

  • Both WT-Pico and IVT are valid methods for C. elegans larval nervous system gene expression profiling with low false positives.
  • Each amplification method detects a unique subset of neural-enriched transcripts; combining data increases identified genes.
  • WT-Pico is preferred for limited RNA samples due to its sensitivity and ease of use.