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Alexander Solovyov1, Nicolas Vabret2, Kshitij S Arora3

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Summary
This summary is machine-generated.

Analyzing total RNA reveals distinct repeat expression patterns in cancer, offering potential biomarkers for immunotherapy response and tumor immunity. This approach captures a broader spectrum of repeat transcription than poly(A) selection.

Keywords:
ERVHSATIIRNA-seqcancer immunityimmunotherapyinnate immunitymicroenvironmentrepetitive elements

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Area of Science:

  • Genomics
  • Cancer Biology
  • Immunology

Background:

  • Derepression of endogenous repeats is hypothesized to drive anti-tumoral innate activation.
  • Understanding repeat transcriptomes is crucial for cancer research and immunotherapy.

Purpose of the Study:

  • To compare RNA sequencing protocols for assessing repeat transcriptomes in The Cancer Genome Atlas (TCGA).
  • To evaluate the utility of repeat expression as biomarkers for clinical outcomes and immunotherapy response.

Main Methods:

  • Comparison of poly(A) selection versus total RNA sequencing protocols.
  • Analysis of The Cancer Genome Atlas (TCGA) data for repeat expression and co-expression.
  • Correlation analysis of repeat derepression with clinical outcomes and immune phenotypes.
  • In situ validation of findings in tumor samples.

Main Results:

  • Total RNA sequencing captures a more comprehensive repeat transcriptome than poly(A) selection, revealing distinct co-expression subgroups.
  • Endogenous retrovirus expression shows potential predictive value for immunotherapy response in specific cohorts.
  • Global repeat derepression, including HSATII satellite repeats, correlates with an immunosuppressive phenotype in colorectal and pancreatic tumors.

Conclusions:

  • Total RNA sequencing is superior for analyzing the full spectrum of repeat transcription.
  • Repeat expression patterns, particularly global derepression, are linked to tumor immunity and immunosuppression.
  • Further investigation into repeat transcription is essential for understanding their role in cancer immunity and developing novel biomarkers.