Proteogenomic characterization of human colon and rectal cancer.

Zhang B, Wang J, Wang X, Zhu J, Liu Q, Shi Z, Chambers MC, Zimmerman LJ, Shaddox KF, Kim S, Davies SR, Wang S, Wang P, Kinsinger CR, Rivers RC, Rodriguez H, Townsend RR, Ellis MJ, Carr SA, Tabb DL, Coffey RJ, Slebos RJ, Liebler DC, NCI CPTAC
Nature. 2014 513 (7518): 382-7

PMID: 25043054 · PMCID: PMC4249766 · DOI:10.1038/nature13438

Extensive genomic characterization of human cancers presents the problem of inference from genomic abnormalities to cancer phenotypes. To address this problem, we analysed proteomes of colon and rectal tumours characterized previously by The Cancer Genome Atlas (TCGA) and perform integrated proteogenomic analyses. Somatic variants displayed reduced protein abundance compared to germline variants. Messenger RNA transcript abundance did not reliably predict protein abundance differences between tumours. Proteomics identified five proteomic subtypes in the TCGA cohort, two of which overlapped with the TCGA 'microsatellite instability/CpG island methylation phenotype' transcriptomic subtype, but had distinct mutation, methylation and protein expression patterns associated with different clinical outcomes. Although copy number alterations showed strong cis- and trans-effects on mRNA abundance, relatively few of these extend to the protein level. Thus, proteomics data enabled prioritization of candidate driver genes. The chromosome 20q amplicon was associated with the largest global changes at both mRNA and protein levels; proteomics data highlighted potential 20q candidates, including HNF4A (hepatocyte nuclear factor 4, alpha), TOMM34 (translocase of outer mitochondrial membrane 34) and SRC (SRC proto-oncogene, non-receptor tyrosine kinase). Integrated proteogenomic analysis provides functional context to interpret genomic abnormalities and affords a new paradigm for understanding cancer biology.

MeSH Terms (21)

Chromosomes, Human, Pair 20 Colonic Neoplasms CpG Islands DNA Copy Number Variations DNA Methylation Genomics Genomics Hepatocyte Nuclear Factor 4 Humans Microsatellite Repeats Mitochondrial Membrane Transport Proteins Mutation, Missense Neoplasm Proteins Point Mutation Proteome Proteomics Proto-Oncogene Proteins pp60(c-src) Rectal Neoplasms RNA, Messenger RNA, Neoplasm Transcriptome

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