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• W2062387404 abstract "Mathematical methods of analysis of microarray hybridizations deal with gene expression profiles as elementary units. However, some of these profiles do not reflect a biologically relevant transcriptional response, but rather stem from technical artifacts. Here, we describe two technically independent but rationally interconnected methods for identification of such artifactual profiles. Our diagnostics are based on detection of deviations from uniformity, which is assumed as the main underlying principle of microarray design. Method 1 is based on detection of non‐uniformity of microarray distribution of printed genes that are clustered based on the similarity of their expression profiles. Method 2 is based on evaluation of the presence of gene‐specific microarray spots within the slides’ areas characterized by an abnormal concentration of low/high differential expression values, which we define as ‘patterns of differentials’. Applying two novel algorithms, for nested clustering (method 1) and for pattern detection (method 2), we can make a dual estimation of the profile’s quality for almost every printed gene. Genes with artifactual profiles detected by method 1 may then be removed from further analysis. Suspicious differential expression values detected by method 2 may be either removed or weighted according to the probabilities of patterns that cover them, thus diminishing their input in any further data analysis." @default.
• W2062387404 created "2016-06-24" @default.
• W2062387404 creator A5086233406 @default.
• W2062387404 date "2004-02-23" @default.
• W2062387404 modified "2023-10-12" @default.
• W2062387404 title "Identification and handling of artifactual gene expression profiles emerging in microarray hybridization experiments" @default.
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• W2062387404 doi "https://doi.org/10.1093/nar/gnh043" @default.
• W2062387404 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/390318" @default.
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