David Quigley  Journal of Investigative Dermatology 

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RNA-seq Permits a Closer Look at Normal Skin and Psoriasis Gene Networks  David Quigley  Journal of Investigative Dermatology  Volume 134, Issue 7, Pages 1789-1791 (July 2014) DOI: 10.1038/jid.2014.66 Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Correlation analysis identifies changed relationships between genes. (a) Expression levels of two hypothetical genes (solid and open circles) measured in normal and diseased tissue samples. Although each gene is expressed at the same level on average in both conditions, their expression levels are only correlated in disease. This relationship would not be evident from analysis of gene expression levels. (b) Gene expression levels in normal and diseased tissue samples expressed as heat maps, with higher expression brighter yellow and lower expression darker blue. Correlation analysis can identify sets of genes that are significantly correlated with each other in only one state. These genes may be upregulated, downregulated, or not be significantly different in expression levels. A decrease in gene expression between normal and diseased tissue can be complex to interpret when cell population proportions change. (c) In a schematic illustration, expansion of cells in the epidermis (rectangles) compared with cells in the dermis (hexagons) without a change in expression levels is illustrated at the top. A decrease in expression of dermal cells (colored blue, as in the heat map) without change in the relative cell population proportions is illustrated at the bottom. In both cases, the microarray will report a decrease in dermal gene expression relative to epidermal gene expression; additional analysis is required to understand to what extent each scenario applies. Journal of Investigative Dermatology 2014 134, 1789-1791DOI: (10.1038/jid.2014.66) Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions