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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Episomal HBV persistence within transcribed host nuclear chromatin compartments involves HBx.

Kai O Hensel1,2, Franziska Cantner1, Felix Bangert1

  • 1Department of Pediatrics, HELIOS University Hospital Wuppertal, Centre for Clinical and Translational Research (CCTR), Faculty of Health, Centre for Biomedical Education and Research (ZBAF), Witten/Herdecke University, Heusnerstr. 40, 42283, Wuppertal, Germany.

Epigenetics & Chromatin
|June 24, 2018
PubMed
Summary

Hepatitis B virus (HBV) episomes and the HBV X protein (HBx) associate with active host genome regions. HBx may stabilize HBV episomal nuclear localization, contributing to viral persistence.

Keywords:
Chromatin fiber loopsEpigenomeEpisomeHBxAgHost–pathogen interactionOncogeneSupranucleosomal structureTADsTranscription factoriesX-protein

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Area of Science:

  • Hepatology
  • Virology
  • Molecular Biology
  • Epigenetics

Background:

  • Hepatitis B virus (HBV) genomes exist as covalently closed circular DNA (cccDNA) in hepatocyte nuclei.
  • The HBV X protein (HBx) is crucial for initiating and maintaining HBV replication.
  • The nuclear localization and function of cccDNA and HBx are not fully understood.

Purpose of the Study:

  • To investigate virus-host genome interactions within the nuclear landscape.
  • To explore the role of HBx in the nuclear localization of HBV cccDNA.
  • To understand the mechanisms underlying HBV episomal stability and viral persistence.

Main Methods:

  • Combined circular chromosome conformation capture (4C) with RNA-seq and ChIP-seq.
  • Studied HBx binding to HBV episomes in HBV-positive HepaRG hepatocytes.
  • Investigated the effect of HBx silencing on episomal HBV stability.

Main Results:

  • HBV episomes and HBx preferentially associate with actively transcribed nuclear domains of the host genome.
  • HBx alone was found in transcribed chromatin domains.
  • Silencing HBx led to reduced HBV episomal stability.

Conclusions:

  • HBx may stabilize the nuclear localization of HBV episomes as part of the episome.
  • Findings contribute to understanding long-term episomal stability and viral persistence.
  • Further research is needed to elucidate the precise mechanisms of HBx in HBV nuclear persistence.