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Repetitive Sequence Transcription in Breast Cancer.

Walter Arancio1, Claudia Coronnello1

  • 1Advanced Data Analysis Group, Fondazione Ri.MED, 90133 Palermo, Italy.

Cells
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

Altered expression of repetitive DNA sequences, including satellites, is linked to breast cancer progression and genomic instability. Specific repeat families are upregulated based on cancer subtype, differing from healthy tissues.

Keywords:
HERVLINE1SVAbreast cancercentromeresendogenous retrovirusrepetitive sequencessatellite repeatstelomerestransposons

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Area of Science:

  • Genomics
  • Epigenetics
  • Cancer Biology

Background:

  • Repetitive sequences comprise ~50% of the human genome and are involved in development and epigenetic regulation.
  • Aberrant activity of repetitive sequences can cause genomic instability, contributing to disease and cancer.
  • Understanding repetitive sequence expression in cancer is crucial for diagnostics and therapeutics.

Purpose of the Study:

  • To analyze the expression profiles of DNA repetitive sequences in breast cancer specimens.
  • To investigate the differences in repetitive sequence expression between cancerous and healthy tissues.
  • To identify specific repetitive sequence families associated with different breast cancer subtypes.

Main Methods:

  • Analysis of DNA repetitive sequence expression profiles.
  • Utilizing the HMUCC cohort of breast cancer specimens.
  • Comparative analysis between cancerous and healthy tissue samples.

Main Results:

  • Satellite DNA expression is generally upregulated in breast cancers.
  • Specific satellite families (HSATII, ALR, SAR, GSAT) are upregulated in distinct breast cancer histotypes (HER2-enriched, Luminal A/B, triple-negative).
  • Expression patterns of repetitive sequences in healthy tissues of cancer patients differ from non-cancerous controls.

Conclusions:

  • Distinct expression patterns of repetitive sequences, particularly satellite repeats, are observed in breast cancer specimens.
  • These findings highlight the role of repetitive sequences in breast cancer heterogeneity and progression.
  • Repetitive sequence expression analysis may offer insights into breast cancer subtypes and patient-specific molecular profiles.