Long interspersed nuclear element-1 expression and retrotransposition in prostate cancer cells

Erica M. Briggs, Susan Ha, Paolo Mita, Gregory Brittingham, Ilaria Sciamanna, Corrado Spadafora, Susan K. Logan

Research output: Contribution to journalArticlepeer-review

Abstract

Background Long Interspersed Nuclear Element-1 (LINE-1) is an autonomous retrotransposon that generates new genomic insertions through the retrotransposition of a RNA intermediate. Expression of LINE-1 is tightly repressed in most somatic tissues to prevent DNA damage and ensure genomic integrity. However, the reactivation of LINE-1 has been documented in cancer and the role of LINE-1 protein expression and retrotransposition has become of interest in the development, progression, and adaptation of many epithelial neoplasms, including prostate cancer. Results Here, we examined endogenous LINE-1 protein expression and localization in a panel of prostate cancer cells and observed a diverse range of LINE-1 expression patterns between cell lines. Subcellular localization of LINE-1 proteins, ORF1p and ORF2p, revealed distinct expression patterns. ORF1p, a nucleic acid chaperone that binds LINE-1 mRNA, was predominantly expressed in the cytoplasm, with minor localization in the nucleus. ORF2p, containing endonuclease and reverse transcriptase domains, exhibited punctate foci in the nucleus and also displayed co-localization with PCNA and 3H2AX. Using a retrotransposition reporter assay, we found variations in LINE-1 retrotransposition between cell lines. Conclusions Overall, our findings reveal new insight into the expression and retrotransposition of LINE-1 in prostate cancer. The prostate cancer cells we investigated provide a unique model for investigating endogenous LINE-1 activity and provide a functional model for studying LINE-1 mechanisms in prostate cancer.

Original languageEnglish
Article number1
JournalMobile DNA
Volume9
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

Keywords

  • Fluorescence
  • LINE-1
  • Prostate cancer
  • Protein expression
  • Retrotransposition
  • Transposable element
  • Tumor cell biology

ASJC Scopus subject areas

  • Molecular Biology

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