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The Genom of Homo sapiens.pdf

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106 WINDEMUTH ET AL.Given our results and all the evidence discussed above,it is highly likely that ZNF295 is a general transcriptionfactor and is a very good candidate for more detailed experimentalapproaches to investigate its transcriptionalactivity, target genes, and possible role in cellular growthand differentiation.Use <strong>of</strong> Genetic Associations for the Inference <strong>of</strong>Regulatory Networks<strong>The</strong>re have been many attempts to deduce regulatorynetworks from expression data (Gat-Viks and Shamir2003; Johansson et al. 2003; Kwon et al. 2003; Segal etal. 2003). A major reason for this being such a hard taskis that correlated expression levels do not provide informationon the causality <strong>of</strong> the correlation. If gene A andgene B are found to be correlated, this could be due to any<strong>of</strong> the five following mechanisms: (1) A regulates B, (2)B regulates A, (3) A regulates X which regulates B, (4) Bregulates X which regulates A, (5) X regulates both A andB. To resolve the resulting ambiguities, it is necessary tocollect expression data as time series, on a sample that isnot in a steady state. Alternatively, causality informationcan be obtained by actively disturbing the system; e.g., byknocking out genes or interfering with transcription inother ways. Both <strong>of</strong> these methods require many measurementsunder carefully controlled conditions, followedby complex analysis.Genetic associations with expression provide a muchmore direct picture <strong>of</strong> the causality <strong>of</strong> regulation, sincecausation has to go from genotype to phenotype. In thesame terms as above, if the genotype <strong>of</strong> gene A is foundassociated with the expression <strong>of</strong> gene B, there are nowonly two possibilities: (1) A regulates B and (2) A regulatesX regulates B. Furthermore, only one measurementis needed, and the sample can be in a steady state. Oneway <strong>of</strong> looking at it is that the role <strong>of</strong> the perturbation necessaryfor deducing causality is played by the naturallyoccurring variations in the genome. This opens the possibilitythat studies such as the one described here will be auseful tool for the discovery <strong>of</strong> gene–gene interactions inthe emerging field <strong>of</strong> Systems Biology.ACKNOWLEDGMENTSWe thank the entire team at Genaissance Pharmaceuticalsfor their valuable contributions to building the Hapdatabase that made this work possible.REFERENCESAyoubi T.A. and Van De Ven W.J. 1996. Regulation <strong>of</strong> gene expressionby alternative promoters. 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