MiningABs: mining associated biomarkers across multi-connected gene expression datasets

BMC Bioinformatics

Chun-Pei Cheng¹  Christopher DeBoever¹  Kelly A Frazer³  Yu-Cheng Liu²  Vincent S Tseng⁴ 

[1] Moores UCSD Cancer Center, University of California San Diego, La Jolla, California, USA

[2] Department of Environmental and Occupational Health, National Cheng Kung University, Tainan, Taiwan

[3] Institute for Genomic Medicine, University of California San Diego, La Jolla, California, USA

[4] Institute of Medical Informatics, National Cheng Kung University, Tainan, Taiwan

关键词: Gene expression;    Combination effects;    Meta-analysis;    Associated biomarkers;    Mining ABs;   

Others  :  818465
DOI  :  10.1186/1471-2105-15-173

 received in 2013-11-06, accepted in 2014-06-03,  发布年份 2014

【 摘 要 】

Background

Human disease often arises as a consequence of alterations in a set of associated genes rather than alterations to a set of unassociated individual genes. Most previous microarray-based meta-analyses identified disease-associated genes or biomarkers independent of genetic interactions. Therefore, in this study, we present the first meta-analysis method capable of taking gene combination effects into account to efficiently identify associated biomarkers (ABs) across different microarray platforms.

Results

We propose a new meta-analysis approach called MiningABs to mine ABs across different array-based datasets. The similarity between paired probe sequences is quantified as a bridge to connect these datasets together. The ABs can be subsequently identified from an “improved” common logit model (c-LM) by combining several sibling-like LMs in a heuristic genetic algorithm selection process. Our approach is evaluated with two sets of gene expression datasets: i) 4 esophageal squamous cell carcinoma and ii) 3 hepatocellular carcinoma datasets. Based on an unbiased reciprocal test, we demonstrate that each gene in a group of ABs is required to maintain high cancer sample classification accuracy, and we observe that ABs are not limited to genes common to all platforms. Investigating the ABs using Gene Ontology (GO) enrichment, literature survey, and network analyses indicated that our ABs are not only strongly related to cancer development but also highly connected in a diverse network of biological interactions.

Conclusions

The proposed meta-analysis method called MiningABs is able to efficiently identify ABs from different independently performed array-based datasets, and we show its validity in cancer biology via GO enrichment, literature survey and network analyses. We postulate that the ABs may facilitate novel target and drug discovery, leading to improved clinical treatment. Java source code, tutorial, example and related materials are available at “http://sourceforge.net/projects/miningabs/ webcite”.

【 授权许可】

   
2014 Cheng et al.; licensee BioMed Central Ltd.

【 图 表 】

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