SMITE: an R/Bioconductor package that identifies network modules by integrating genomic and epigenomic information

BMC Bioinformatics

Software

John M. Greally¹  N. Ari Wijetunga¹  Andrew D. Johnston¹  Netha Ulahannan²  Fabien Delahaye³  Kami Kim⁴  Ryo Maekawa⁵ 

[1] Department of Genetics, Albert Einstein College of Medicine, 1301 Morris Park Avenue, 10461, Bronx, NY, USA;Department of Genetics, Albert Einstein College of Medicine, 1301 Morris Park Avenue, 10461, Bronx, NY, USA;Department of Microbiology and Immunology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, 10461, Bronx, NY, USA;Department of Genetics, Albert Einstein College of Medicine, 1301 Morris Park Avenue, 10461, Bronx, NY, USA;Department of Obstetrics, Gynecology and Women’s Health, Albert Einstein College of Medicine, 1301 Morris Park Avenue, 10461, Bronx, NY, USA;Department of Microbiology and Immunology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, 10461, Bronx, NY, USA;Department of Pathology, Albert Einstein College of Medicine, 1301 Morris Park Avenue, 10461, Bronx, NY, USA;Department of Medicine, Albert Einstein College of Medicine, 1301 Morris Park Avenue, 10461, Bronx, NY, USA;Division of Obstetrics and Gynecology, Yamaguchi University, 677-1 Yoshida, 753-8511, Yamaguchi Prefecture, Japan;

关键词: Epigenetic;    Gene expression;    Modules;    Interaction network;    Genomic;    Bioinformatics;   

DOI  :  10.1186/s12859-017-1477-3

 received in 2016-04-30, accepted in 2017-01-07,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundThe molecular assays that test gene expression, transcriptional, and epigenetic regulation are increasingly diverse and numerous. The information generated by each type of assay individually gives an insight into the state of the cells tested. What should be possible is to add the information derived from separate, complementary assays to gain higher-confidence insights into cellular states. At present, the analysis of multi-dimensional, massive genome-wide data requires an initial pruning step to create manageable subsets of observations that are then used for integration, which decreases the sizes of the intersecting data sets and the potential for biological insights. Our Significance-based Modules Integrating the Transcriptome and Epigenome (SMITE) approach was developed to integrate transcriptional and epigenetic regulatory data without a loss of resolution.ResultsSMITE combines p-values by accounting for the correlation between non-independent values within data sets, allowing genes and gene modules in an interaction network to be assigned significance values. The contribution of each type of genomic data can be weighted, permitting integration of individually under-powered data sets, increasing the overall ability to detect effects within modules of genes. We apply SMITE to a complex genomic data set including the epigenomic and transcriptomic effects of Toxoplasma gondii infection on human host cells and demonstrate that SMITE is able to identify novel subnetworks of dysregulated genes. Additionally, we show that SMITE outperforms Functional Epigenetic Modules (FEM), the current paradigm of using the spin-glass algorithm to integrate gene expression and epigenetic data.ConclusionsSMITE represents a flexible, scalable tool that allows integration of transcriptional and epigenetic regulatory data from genome-wide assays to boost confidence in finding gene modules reflecting altered cellular states.

【 授权许可】

CC BY   
© The Author(s). 2017

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