Abstract
Systematic identification of causal disease genes can shed light on the mechanisms underlying complex diseases and provide crucial information to develop efficient biomarkers or design suitable therapies. The present paper describes a novel approach to detect potential disease genes for lung cancer, based on consistently differential interaction (CDI) scheme from heterogeneous disease datasets. In particular, reliable disordered regulations in disease states were discovered by identifying the CDIs, from which the disease genes were further detected based on their topological structures on the network. As an application of the CDI-based method, the RNA-seq data of two subtypes of non-small lung cancer were used to identify CDIs from normal to cancer onset. The results of analysis well agree with the prior knowledge as well as the experiments, thereby implying the predictive power of the CDI-based method. The comparison with other approaches also indicated the superiority of the CDI-based method in terms of accuracy and effectiveness on detecting disease-specific genes for lung cancer and metastasis. In contrast to conventional molecular biomarkers, the identified CDIs as novel network biomarkers or edge biomarkers can be applied to predict patient survival for both subtypes of lung cancers, and the interactions among CDIs can be further used as new edgetic targets for network drug design. In addition, a potential molecular mechanism was developed to explain the key roles of the identified CDIs in lung cancer and metastasis from a network perspective.
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Acknowledgments
This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) (No. XDB13040700), the National Program on Key Basic Research Project (No. 2014CB910504), and the National Natural Science Foundation of China (NSFC) (Nos. 91439103, 61134013, 61403363, 31200987). This work was supported by the Knowledge Innovation Program of SIBS of CAS (No. 2013KIP218) and China Postdoctoral Science Foundation (Nos. 2014T70441, 2013M541565). The work was supported by Zhongshan Distinguished Professor Grant (XDW), NSFC (91230204, 81270099, 81320108001, 81270131, 81300010), The Shanghai Committee of Science and Technology (12JC1402200, 12431900207, 11410708600, 14431905100), Operation funding of Shanghai Institute of Clinical Bioinformatics, and Ministry of Education, Academic Special Science and Research Foundation for PhD Education (20130071110043).
Author contributions
LC and XL planed this study. QS, XL, and TZ designed the experiments. QS wrote the manuscript. All authors read and approved the final manuscript.
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Qianqian Shi and Xiaoping Liu contributed equally to this work.
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Supplementary Fig. 1
Network modules capture specific-cancer hallmarks for LUSC. (A) The 42 network modules with 292 interactions among 333 genes for LUSC were obtained from the integrated PINs identified by CDI, and the most abundant feature sets with more than 3 genes were kept. Blue edges indicate the down correlated gene-pairs in tumor compared to normal, and red edges indicate up correlated gene-pairs in tumor. (B) General cancer and LUSC-associated genes were identified from the predicted gene sets by CDI or the same number of top gene sets created by DI or DG. (C) Clinical covariate association test for differential expressed nodes and edges in LUSC predicted modules using Fisher’s exact test. The postfix for methods, like “-nonbatch” or “-batch” is added for distinguishing method’s characteristic in the comparative analysis, e.g., “batch” means meta process considering K datasets. The solid black line in (B) and (C) represents the enrichment significance of –log(0.05). (PDF 2653 kb)
Supplementary Fig. 2
The relations among the predicted results and prior information are different. Those interaction sets identified by CDI, DI and extracted from GeneCards share different edges for LUAD (A) and LUSC (C). Interactions for GeneCards are defined as those edges with as least one gene from GeneCards. Those gene sets identified by CDI, DG and extracted from GeneCards share different nodes for LUAD (B) and LUSC (D). (PDF 265 kb)
Supplementary Fig. 3
The prognostic role of clinical outcomes in non-small cell lung cancer. Kaplan–Meier analysis of overall survival based on N stage (A), T stage (B) and disease stage (C) for LUAD and LUSC. (PDF 243 kb)
Supplementary Fig. 4
Edges associated with prognosis in TCGA lung squamous cell cancer cohort and 12 signature predictor analysis. (A) The matrix visualizes the significant HRs for the 18 edges in the TCGA LUSC cohort. Numbers in the rectangles indicate the HRs for expression with significant univariate Cox regression (P- value < 0.1). Red rectangles indicate HRs >1 and blue rectangles indicate HRs < 1. (B) 12 edges are finally identified as the predictor signature. The Kaplan–Meier curves for LUSC (C) and for LUAD (D) risk groups were obtained from the TCGA cohort divided by the median cutoff point as shown in the right up plot of the predictor-score distribution. (PDF 290 kb)
Supplementary Table 1
Information of LUAD and LUSC samples from TCGA. Eight datasets expression profiles are for lung squamous cell carcinoma and 18 for lung adenocarcinoma. For disease samples column, each row represents a dataset we used. (PDF 111 kb)
Supplementary Table 2
Available clinical information of the cohort for LUAD and LUSC. Age, gender, disease stage, N stage, M stage, T stage and smoking status outcomes are collected (e.g., Nonsmoker: lifetime nonsmoker or current reformed smoker for >15 years) (PDF 121 kb)
Supplementary Table 3
All the consensus network modules for LUAD by CDI, with sign consensus value as weight, which from −1 to +1 corresponds to down and up correlated level. (CSV 20 kb)
Supplementary Table 4
All the consensus network modules for LUSC by CDI, with sign consensus value as weight, which from −1 to +1 corresponds to down and up correlated level. (CSV 24 kb)
Supplementary Table 5
Intersection between the disease gene sets for LUAD and LUSC by CDI, with sign-consistent value as weight, which from −1 to +1 corresponds to down and up differential expression level by DG. (TXT 1 kb)
Table 3
Correlation P values between edge prognostic signatures and known NSCLC metastasis gene markers for LUSC. Table cells with P value > 0.05 are removed (PDF 166 kb)
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Shi, Q., Liu, X., Zeng, T. et al. Detecting disease genes of non-small lung cancer based on consistently differential interactions. Cancer Metastasis Rev 34, 195–208 (2015). https://doi.org/10.1007/s10555-015-9561-5
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DOI: https://doi.org/10.1007/s10555-015-9561-5