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Measuring absolute expression with microarrays with a calibrated reference sample and an extended signal intensity
Aimée M Dudley1, John Aach, Martin A Steffen
1Department of Genetics, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.
Summary
This study introduces a new microarray method using an oligo reference for accurate RNA quantification. This approach overcomes limitations of traditional gene expression ratios, enabling absolute expression measurements.
Area of Science:
- Molecular Biology
- Genomics
- Biotechnology
Background:
- Spotted-glass microarrays are crucial for studying gene expression.
- Conventional methods using cDNA references have limitations in quantifying absolute RNA levels and comparing experiments.
Purpose of the Study:
- To develop a novel microarray hybridization method for accurate absolute RNA quantification.
- To overcome the limitations of traditional gene expression ratio analysis.
Main Methods:
- Hybridizing samples against labeled oligos complementary to microarray features, using an oligo reference instead of a cDNA reference.
- Employing a linear regression algorithm with a PERL script to combine multiple scanner sensitivity settings for accurate intensity measurement.
Main Results:
- The new method provides accurate RNA levels on a scale related to absolute abundance.
- Results show improved retention of absolute abundance information compared to conventional microarray ratios.
Conclusions:
- This method enables more reliable and comparable gene expression analysis.
- Future applications include measuring RNA expression on an absolute scale (transcripts per cell) for various organisms.