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Related Experiment Videos

The 3' region of human papillomavirus type 16 early mRNAs decrease expression.

Jeppe Vinther1, Maiken W Rosenstierne, Karen Kristiansen

  • 1Institute of Molecular Pathology, University of Copenhagen, Blegdamsvej 3C, Bldg, 6,2, DK-2200 Copenhagen N, Denmark. jvinther@bi.ku.dk

BMC Infectious Diseases
|October 18, 2005
PubMed
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The 3' region of high-risk human papillomavirus (HR-HPV) early mRNAs represses gene expression, potentially contributing to cervical cancer development. This regulatory mechanism appears common across multiple HPV types.

Area of Science:

  • Molecular Biology
  • Virology
  • Oncology

Background:

  • High-risk human papillomavirus (HR-HPV) infection is a prerequisite for cervical cancer development.
  • Early HR-HPV proteins can immortalize human cells.
  • HR-HPV DNA integrates into the host genome in most cervical cancers.

Purpose of the Study:

  • To investigate the regulatory role of the 3' region of HPV-16 early mRNAs on gene expression.
  • To determine if this regulatory effect is conserved across other HPV types.

Main Methods:

  • Utilized a retroviral GUS reporter system in HaCaT and SiHa cells.
  • Inserted HPV-16 early sequences into the 3' UTR of reporter mRNA.
  • Quantified reporter mRNA and protein levels, and analyzed mRNA stability and integrity.

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Main Results:

  • The 3' region of HPV-16 early mRNAs (nt. 2582-4214) decreased both mRNA and protein levels.
  • Repression was most pronounced at the protein level, suggesting effects on translation.
  • Corresponding regions from other HPV types (except HPV-18) also repressed expression post-transcriptionally.

Conclusions:

  • The 3' region of HPV-16 early mRNAs negatively regulates gene expression.
  • Deletion of this region during cervical oncogenesis may contribute to cellular transformation by deregulating viral oncogene synthesis.
  • Post-transcriptional repression by this region appears to be a general characteristic of the HPV life cycle.