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A High-throughput Cell Microarray Platform for Correlative Analysis of Cell Differentiation and Traction Forces
Published on: March 1, 2017
Technical variability is greater than biological variability in a microarray experiment but both are outweighed by
Penelope A Bryant1, Gordon K Smyth, Roy Robins-Browne
1Department of Paediatrics, The University of Melbourne, Melbourne, Australia.
Plos One
|June 10, 2011
Summary
Gene expression variability in human cells is low, with lipopolysaccharide (LPS) stimulation causing significant changes. This finding supports the use of microarrays for detecting biologically relevant gene expression shifts in infectious diseases.
Area of Science:
- Immunology
- Molecular Biology
- Genomics
Background:
- Experimental variability can obscure biological signals in gene expression studies.
- Quantifying variability in in vitro stimulation experiments is crucial for accurate analysis.
- Human peripheral blood mononuclear cells (PBMC) are a common model for studying immune responses.
Purpose of the Study:
- To quantify biological and technical variability in gene expression during in vitro PBMC stimulation.
- To compare variability to gene expression changes induced by lipopolysaccharide (LPS).
- To assess the reliability of microarray analysis for detecting biologically significant gene expression changes.
Main Methods:
- Human PBMCs were stimulated in vitro with LPS.
- Replication was performed at multiple levels: subjects, days, and technical replicates (stimulation, amplification, hybridization).
- Oligonucleotide microarrays were used to measure gene expression, comparing LPS-stimulated and unstimulated samples against a common reference.
Main Results:
- Gene expression showed higher correlation between technical replicates (0.86-0.93) than between subjects (0.66-0.78).
- Technical variability (SD 0.16) was greater than biological variability (SD 0.06), but both were low.
- LPS stimulation induced gene expression changes significantly larger than any observed variability.
Conclusions:
- Gene expression variability in this experimental system is low and expected to decrease with technical improvements.
- LPS stimulation has a pronounced effect on gene expression, exceeding experimental variability.
- Microarray-based studies are reliable for detecting biologically relevant gene expression changes, particularly in infectious disease research.
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