Integrated time course omics analysis distinguishes immediate therapeutic response from acquired resistance

Genome Med. 2018 May 23;10(1):37. doi: 10.1186/s13073-018-0545-2.

Abstract

Background: Targeted therapies specifically act by blocking the activity of proteins that are encoded by genes critical for tumorigenesis. However, most cancers acquire resistance and long-term disease remission is rarely observed. Understanding the time course of molecular changes responsible for the development of acquired resistance could enable optimization of patients' treatment options. Clinically, acquired therapeutic resistance can only be studied at a single time point in resistant tumors.

Methods: To determine the dynamics of these molecular changes, we obtained high throughput omics data (RNA-sequencing and DNA methylation) weekly during the development of cetuximab resistance in a head and neck cancer in vitro model. The CoGAPS unsupervised algorithm was used to determine the dynamics of the molecular changes associated with resistance during the time course of resistance development.

Results: CoGAPS was used to quantify the evolving transcriptional and epigenetic changes. Applying a PatternMarker statistic to the results from CoGAPS enabled novel heatmap-based visualization of the dynamics in these time course omics data. We demonstrate that transcriptional changes result from immediate therapeutic response or resistance, whereas epigenetic alterations only occur with resistance. Integrated analysis demonstrates delayed onset of changes in DNA methylation relative to transcription, suggesting that resistance is stabilized epigenetically.

Conclusions: Genes with epigenetic alterations associated with resistance that have concordant expression changes are hypothesized to stabilize the resistant phenotype. These genes include FGFR1, which was associated with EGFR inhibitors resistance previously. Thus, integrated omics analysis distinguishes the timing of molecular drivers of resistance. This understanding of the time course progression of molecular changes in acquired resistance is important for the development of alternative treatment strategies that would introduce appropriate selection of new drugs to treat cancer before the resistant phenotype develops.

Keywords: Acquired resistance; Data integration; Epigenetics; Genomics; Precision medicine; Time course analysis.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Algorithms
  • Cell Line, Tumor
  • Cetuximab / pharmacology
  • Cetuximab / therapeutic use
  • Clone Cells
  • DNA Methylation / drug effects
  • DNA Methylation / genetics
  • Disease-Free Survival
  • Drug Resistance, Neoplasm / drug effects
  • Drug Resistance, Neoplasm / genetics*
  • Epigenesis, Genetic / drug effects
  • ErbB Receptors / antagonists & inhibitors
  • ErbB Receptors / metabolism
  • Gene Expression Profiling
  • Gene Expression Regulation, Neoplastic / drug effects
  • Genomics*
  • Head and Neck Neoplasms / genetics
  • Humans
  • Neoplasms, Squamous Cell / genetics
  • Protein Kinase Inhibitors / pharmacology
  • Protein Kinase Inhibitors / therapeutic use
  • Receptor, Fibroblast Growth Factor, Type 1 / metabolism
  • Time Factors
  • Treatment Outcome

Substances

  • Protein Kinase Inhibitors
  • ErbB Receptors
  • FGFR1 protein, human
  • Receptor, Fibroblast Growth Factor, Type 1
  • Cetuximab