Abstract
Somatic mutations in cancer genomes include drivers that provide selective advantages to tumor cells and passengers present due to genome instability. Discovery of pan-cancer drivers will help characterize biological systems important in multiple cancers and lead to development of better therapies. Driver genes are most often identified by their recurrent mutations across tumor samples. However, some mutations are more important for protein function than others. Thus considering the location of mutations with respect to functional protein sites can predict their mechanisms of action and improve the sensitivity of driver gene detection. Protein phosphorylation is a post-translational modification central to cancer biology and treatment, and frequently altered by driver mutations. Here we used our ActiveDriver method to analyze known phosphorylation sites mutated by single nucleotide variants (SNVs) in The Cancer Genome Atlas Research Network (TCGA) pan-cancer dataset of 3,185 genomes and 12 cancer types. Phosphorylation-related SNVs (pSNVs) occur in ~90% of tumors, show increased conservation and functional mutation impact compared to other protein-coding mutations, and are enriched in cancer genes and pathways. Gene-centric analysis found 150 known and candidate cancer genes with significant pSNV recurrence. Using a novel computational method, we predict that 29% of these mutations directly abolish phosphorylation or modify kinase target sites to rewire signaling pathways. This analysis shows that incorporation of information about protein signaling sites will improve computational pipelines for variant function prediction.
Highlights
Somatic mutations in cancer genomes include drivers that provide selective advantages to tumor cells and passengers present due to genome instability
We used our ActiveDriver method to analyze known phosphorylation sites mutated by single nucleotide variants (SNVs) in The Cancer Genome Atlas Research Network (TCGA) pan-cancer dataset of 3,185 genomes and 12 cancer types
We recently proposed that cancer may be driven by statistically significant and spatially specific mutations in protein sites involved in cellular phosphorylation signaling, and developed the ActiveDriver method to detect such mutations comprehensively[7]
Summary
Somatic mutations in cancer genomes include drivers that provide selective advantages to tumor cells and passengers present due to genome instability. We used our ActiveDriver method to analyze known phosphorylation sites mutated by single nucleotide variants (SNVs) in The Cancer Genome Atlas Research Network (TCGA) pan-cancer dataset of 3,185 genomes and 12 cancer types. The recently available pan-cancer dataset of 3,185 tumor genomes and 12 cancer types from The Cancer Genome Atlas (TCGA) comprises the largest collection of somatic cancer mutations to date[65] It involves four www.nature.com/scientificreports times more samples and 24 times more SNVs than previous collections[7], providing the opportunity to discover novel cancer driver genes across multiple cancer types. We analyze the TCGA pan-cancer dataset of protein-coding missense single nucleotide variants (SNVs), as SNVs are easiest to interpret as specific alterations of signaling sites and are more reliably detected and abundant than other types of genetic mutations. We predict known and novel signaling-specific cancer driver genes, create a high-confidence collection of cancer mutations likely involved in altered cellular signaling, and propose numerous specific hypotheses to explain their functional effects
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