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ZPR1 Is Dispensable for HPV R-Loop Resolution but Regulates Host R-Loop Dynamics.

Rylann Moffitt1, Steven Brooks2, Elliot J Androphy3

  • 1Tom and Julie Wood College of Osteopathic Medicine, Marian University, Indianapolis, IN 46222, USA.

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PubMed
Summary
This summary is machine-generated.

Human papillomavirus (HPV) E2 protein resolves viral R-loops but also causes R-loop accumulation in host DNA. ZPR1 protein is not required for HPV R-loop resolution, contrary to findings in mammalian cells.

Keywords:
E2HPV transcriptionR-loopsSETXZPR1

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Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • R-loops, DNA-RNA hybrids, form during papillomavirus transcription and are critical for HPV episomal maintenance.
  • ZPR1 protein recruits SETX helicase to resolve R-loops in mammalian cells.
  • The role of ZPR1 and E2 in HPV R-loop resolution is not fully understood.

Purpose of the Study:

  • To investigate the role of ZPR1 and E2 in HPV R-loop resolution and maintenance.
  • To determine the impact of ZPR1 depletion on viral and cellular R-loops.
  • To analyze the expression of ZPR1 and SETX in HPV-associated cancers.

Main Methods:

  • Depletion of ZPR1 using siRNA.
  • Analysis of R-loop formation using molecular assays.
  • Co-immunoprecipitation to detect protein complexes.
  • TCGA dataset analysis for gene expression.

Main Results:

  • ZPR1 depletion reduced viral R-loops but increased cellular R-loops, suggesting it's not required for HPV R-loop resolution.
  • E2 protein was found associated with R-loops, and its overexpression enhanced R-loop formation.
  • ZPR1, but not SETX, mRNA levels were significantly reduced in HPV-positive cervical and head and neck cancers.
  • E2 may promote R-loop accumulation by sequestering SETX.

Conclusions:

  • ZPR1 is not essential for HPV R-loop resolution, unlike in other mammalian systems.
  • HPV E2 protein plays a dual role in R-loop dynamics, mediating resolution while promoting accumulation in the host genome.
  • Altered ZPR1 expression in HPV-positive cancers suggests a potential role in tumorigenesis.