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A minimal connected network of transcription factors regulated in human tumors and its application to the quest for universal cancer biomarkers.

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Essaghir, Ahmed [UCL] Demoulin, Jean-Baptiste [UCL]

A universal cancer biomarker candidate for diagnosis is supposed to distinguish, within a broad range of tumors, between healthy and diseased patients. Recently published studies have explored the universal usefulness of some biomarkers in human tumors. In this study, we present an integrative approach to search for potential common cancer biomarkers. Using the TFactS web-tool with a catalogue of experimentally established gene regulations, we could predict transcription factors (TFs) regulated in 305 different human cancer cell lines covering a large panel of tumor types. We also identified chromosomal regions having significant copy number variation (CNV) in these cell lines. Within the scope of TFactS catalogue, 88 TFs whose activity status were explained by their gene expressions and CNVs were identified. Their minimal connected network (MCN) of protein-protein interactions forms a significant module within the human curated TF proteome. Functional analysis of the proteins included in this MCN revealed enrichment in cancer pathways as well as inflammation. The ten most central proteins in MCN are TFs that trans-regulate 157 known genes encoding secreted and transmembrane proteins. In publicly available collections of gene expression data from 8,525 patient tissues, 86 genes were differentially regulated in cancer compared to inflammatory diseases and controls. From TCGA cancer gene expression data sets, 50 genes were significantly associated to patient survival in at least one tumor type. Enrichment analysis shows that these genes mechanistically interact in common cancer pathways. Among these cancer biomarker candidates, TFRC, MET and VEGFA are commonly amplified genes in tumors and their encoded proteins stained positive in more than 80% of malignancies from public databases. They are linked to angiogenesis and hypoxia, which are common in cancer. They could be interesting for further investigations in cancer diagnostic strategies.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2012
Language Anglais
Journal information "PLoS One" - Vol. 7, p. e39666 (2012)
Peer reviewed yes
Publisher Public Library of Science ((United States) [S.l.])
issn 1932-6203
Publication status Publié
Affiliation UCL - SSS/DDUV - Institut de Duve
MESH Subject Cell Line, Tumor ; Gene Dosage ; Gene Expression Regulation ; Humans ; Neoplasms ; Oligonucleotide Array Sequence Analysis ; Survival Analysis ; Transcription Factors ; Tumor Markers, Biological
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Bibliographic reference Essaghir, Ahmed ; Demoulin, Jean-Baptiste. A minimal connected network of transcription factors regulated in human tumors and its application to the quest for universal cancer biomarkers.. In: PLoS One, Vol. 7, p. e39666 (2012)
Permanent URL http://hdl.handle.net/2078/120347