Abstract
Mutation position imaging toolbox (MuPIT) interactive is a browser-based application for single-nucleotide variants (SNVs), which automatically maps the genomic coordinates of SNVs onto the coordinates of available three-dimensional (3D) protein structures. The application is designed for interactive browser-based visualization of the putative functional relevance of SNVs by biologists who are not necessarily experts either in bioinformatics or protein structure. Users may submit batches of several thousand SNVs and review all protein structures that cover the SNVs, including available functional annotations such as binding sites, mutagenesis experiments, and common polymorphisms. Multiple SNVs may be mapped onto each structure, enabling 3D visualization of SNV clusters and their relationship to functionally annotated positions. We illustrate the utility of MuPIT interactive in rationalizing the impact of selected polymorphisms in the PharmGKB database, somatic mutations identified in the Cancer Genome Atlas study of invasive breast carcinomas, and rare variants identified in the exome sequencing project. MuPIT interactive is freely available for non-profit use at http://mupit.icm.jhu.edu.
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Acknowledgments
We used the Broad Institute Firehose standardization run from 7 July, 2012, which may be found here in the TCGA Data Coordination Center: http://gdac.broadinstitute.org/runs/stddata__2012_07_07/data/BRCA/20120707/gdac.broadinstitute.org_BRCA.Mutation_Packager_Calls.Level_3.2012070700.0.0.tar.gz.
National Institutes of Health CA152432, 3U24CA143858-2S1, National Science Foundation DBI 0845275.
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N. Niknafs and D. Kim these authors contributed equally.
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Supplementary Figure Captions
Suppl. Fig. 1. N-acetyltransferase 2 in complex with coenzyme A (coA). PharmGKB polymorphic variant associated with the slow acetylator phenotype and increased risk for several cancers and drug toxicity, is adjacent to the coenzyme A binding site. Acetylation of carcinogens and other toxic substrates requires transfer of an acetyl group from acetyl coA. The variant potentially interferes with coA binding. Variant positions appear as green balls.
Supp Fig 2. Receptor tyrosine-protein kinase erbB-2. Four TCGA breast cancer somatic mutations mapped onto the PDB structure 3pp0 (Aertgeerts et al. 2011). One of the mutations lies adjacent to the ATP binding site (pink), whereas another is adjacent to the active site (blue). Variant positions appear as green balls.
Supp Fig 3. Checkpoint kinase-2 in complex with ADP. A single TCGA breast cancer somatic mutation mapped onto the PDB structure 2cn5 (Oliver et al. 2006). CHEK2 is a known breast cancer susceptibility gene. The mutation depicted is directly adjacent to the active site. Variant positions appear as green balls.
Appendix: server-side implementation details
Appendix: server-side implementation details
MuPIT is a Java servlet, accessible to users via a web browser equipped with the Java plugin. The servlet encapsulates a series of Django applications: A Jmol applet for PDB visualization, a database (DB) interfacer, and an overview page constructor (Howard 2013). Javascript functions are used to allow for user interactions between the overview tables and the 3D visualization.
The MuPIT servlet runs on a Dell PowerEdge C1100 server, with four six-core Intel Xeon E5645 2.4 GHz cpus (24 cores total), and 96 GB of RAM.
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Niknafs, N., Kim, D., Kim, R. et al. MuPIT interactive: webserver for mapping variant positions to annotated, interactive 3D structures. Hum Genet 132, 1235–1243 (2013). https://doi.org/10.1007/s00439-013-1325-0
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DOI: https://doi.org/10.1007/s00439-013-1325-0