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10.1186/s12859-017-1742-5

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suck abstract from ncbi


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pmid28697800      BMC+Bioinformatics 2017 ; 18 (ä): ä
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  • SegCorr a statistical procedure for the detection of genomic regions of correlated expression #MMPMID28697800
  • Delatola EI; Lebarbier E; Mary-Huard T; Radvanyi F; Robin S; Wong J
  • BMC Bioinformatics 2017[]; 18 (ä): ä PMID28697800show ga
  • Background: Detecting local correlations in expression between neighboring genes along the genome has proved to be an effective strategy to identify possible causes of transcriptional deregulation in cancer. It has been successfully used to illustrate the role of mechanisms such as copy number variation (CNV) or epigenetic alterations as factors that may significantly alter expression in large chromosomal regions (gene silencing or gene activation). Results: The identification of correlated regions requires segmenting the gene expression correlation matrix into regions of homogeneously correlated genes and assessing whether the observed local correlation is significantly higher than the background chromosomal correlation. A unified statistical framework is proposed to achieve these two tasks, where optimal segmentation is efficiently performed using dynamic programming algorithm, and detection of highly correlated regions is then achieved using an exact test procedure. We also propose a simple and efficient procedure to correct the expression signal for mechanisms already known to impact expression correlation. The performance and robustness of the proposed procedure, called SegCorr, are evaluated on simulated data. The procedure is illustrated on cancer data, where the signal is corrected for correlations caused by copy number variation. It permitted the detection of regions with high correlations linked to epigenetic marks like DNA methylation. Conclusions: SegCorr is a novel method that performs correlation matrix segmentation and applies a test procedure in order to detect highly correlated regions in gene expression. Electronic supplementary material: The online version of this article (doi:10.1186/s12859-017-1742-5) contains supplementary material, which is available to authorized users.
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