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• W1963531361 endingPage "e19556" @default.
• W1963531361 startingPage "e19556" @default.
• W1963531361 abstract "A central issue in the design of microarray-based analysis of global gene expression is that variability resulting from experimental processes may obscure changes resulting from the effect being investigated. This study quantified the variability in gene expression at each level of a typical in vitro stimulation experiment using human peripheral blood mononuclear cells (PBMC). The primary objective was to determine the magnitude of biological and technical variability relative to the effect being investigated, namely gene expression changes resulting from stimulation with lipopolysaccharide (LPS).Human PBMC were stimulated in vitro with LPS, with replication at 5 levels: 5 subjects each on 2 separate days with technical replication of LPS stimulation, amplification and hybridisation. RNA from samples stimulated with LPS and unstimulated samples were hybridised against common reference RNA on oligonucleotide microarrays. There was a closer correlation in gene expression between replicate hybridisations (0.86-0.93) than between different subjects (0.66-0.78). Deconstruction of the variability at each level of the experimental process showed that technical variability (standard deviation (SD) 0.16) was greater than biological variability (SD 0.06), although both were low (SD<0.1 for all individual components). There was variability in gene expression both at baseline and after stimulation with LPS and proportion of cell subsets in PBMC was likely partly responsible for this. However, gene expression changes after stimulation with LPS were much greater than the variability from any source, either individually or combined.Variability in gene expression was very low and likely to improve further as technical advances are made. The finding that stimulation with LPS has a markedly greater effect on gene expression than the degree of variability provides confidence that microarray-based studies can be used to detect changes in gene expression of biological interest in infectious diseases." @default.
• W1963531361 created "2016-06-24" @default.
• W1963531361 creator A5032374370 @default.
• W1963531361 creator A5033166682 @default.
• W1963531361 creator A5053608981 @default.
• W1963531361 creator A5079507328 @default.
• W1963531361 date "2011-05-31" @default.
• W1963531361 modified "2023-10-16" @default.
• W1963531361 title "Technical Variability Is Greater than Biological Variability in a Microarray Experiment but Both Are Outweighed by Changes Induced by Stimulation" @default.
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• W1963531361 doi "https://doi.org/10.1371/journal.pone.0019556" @default.
• W1963531361 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3104982" @default.
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• W1963531361 hasPublicationYear "2011" @default.
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