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Area of Science:

  • Oncology
  • Genomics
  • Cancer Biology

Background:

  • Ovarian cancer has a high mortality rate due to treatment resistance.
  • Intra-tumoral heterogeneity, driven by genomic instability, fuels disease recurrence and treatment failure.

Purpose of the Study:

  • To investigate the degrees of heterogeneity in epithelial ovarian carcinomas.
  • To analyze clonal evolution and its correlation with genomic alterations and gene expression.

Main Methods:

  • Single-cell whole genome sequencing
  • Spatial transcriptomics of five late-stage, treatment-naïve primary epithelial ovarian carcinomas
  • Analysis of copy number aberrations, loss of heterozygosity, and somatic mutations

Main Results:

  • Widespread copy number aberrations and diversification in copy number gain regions observed in all samples.
  • Diversification associated with whole genome doubling; pseudo-diploid cells indicative of pre-malignant phenotypes identified.
  • Specific examples highlight functionally consequential copy number alterations and CTNNB1 mutation reversion driving clonal evolution and plasticity.

Conclusions:

  • Genomic instability significantly contributes to clonal heterogeneity and plasticity in ovarian cancer.
  • Understanding these evolutionary dynamics is crucial for developing effective therapeutic strategies.
  • Single-cell genomics and spatial transcriptomics provide powerful insights into tumor evolution.