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Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
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Published on: April 12, 2019

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The insertion and dysregulation of transposable elements in osteosarcoma and their association with patient

Chao Wang1, Chun Liang2

  • 1Department of Biology, Miami University, Oxford, Ohio, 45056, USA. wangc90@miamioh.edu.

Scientific Reports
|January 11, 2022
PubMed

Insights

Transposable element (TE) activity is dysregulated in osteosarcoma, with increased LINE-1 and Alu expression linked to DNA repair. Higher TE insertions correlate with longer event-free survival in osteosarcoma patients.

Area of Science:

  • Genomics
  • Cancer Biology
  • Molecular Oncology

Background:

  • Transposable elements (TEs) are mobile DNA sequences implicated in various cancers.
  • Osteosarcoma (OS) is a primary bone cancer where TE activity remains understudied.
  • Understanding TE dysregulation in OS is crucial for identifying novel therapeutic targets.

Purpose of the Study:

  • To investigate the activity and impact of transposable elements in osteosarcoma.
  • To characterize TE insertions and their genomic associations in OS tumors.
  • To explore the relationship between TE activity and patient survival outcomes.

Main Methods:

  • Integrative analysis of RNA-sequencing, whole-genome sequencing (WGS), and DNA methylation data.
  • Identification and characterization of transposable element insertions, including somatic and germline events.
  • Correlation analysis between TE activity, gene expression, methylation patterns, and clinical data.

Main Results:

  • Aberrant expression of LINE-1, Alu, SVA, and HERV-K elements was observed in OS tumors, associated with enhanced DNA repair.
  • LINE-1 insertions exhibited characteristic target site duplications and preferential integration into AT-rich, intergenic, and intronic regions.
  • Germline TE insertions, particularly in non-cancer genes, were frequent and associated with neuronal processes or transcription factors; higher TE insertions correlated with longer event-free survival.

Conclusions:

  • Transposable element dysregulation is a significant feature of osteosarcoma, impacting genomic stability and gene expression.
  • Specific TE insertion patterns and germline variants may serve as biomarkers for osteosarcoma prognosis.
  • Further research into TE-host interactions could reveal new therapeutic strategies for osteosarcoma.

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