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Related Concept Videos

Hepatitis01:25

Hepatitis

Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver. The...
Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion of food...

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A Cell Culture Model for Producing High Titer Hepatitis E Virus Stocks
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Systematic screening for novel, serologically reactive Hepatitis E Virus epitopes.

Andreas Osterman1, Maria Guadalupe Vizoso Pinto, Rudolf Haase

  • 1Max von Pettenkofer-Institute, Department of Virology, Ludwig-Maximilians-University Munich, Germany. osterman@mvp.uni-muenchen.de

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|January 25, 2012
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Summary

Hepatitis E Virus (HEV) ORF1 antigens show diagnostic potential, broadening current HEV testing. While not improving sensitivity, these ORF1 epitopes enhance overall assay quality and may aid in differentiating HEV genotypes.

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Area of Science:

  • Virology
  • Immunology
  • Diagnostic Assay Development

Background:

  • Hepatitis E is an emerging disease, with increasing zoonotic cases in industrialized nations.
  • Current commercial Hepatitis E Virus (HEV) antibody assays primarily use fragments of HEV open reading frame (ORF) 2 and ORF3.
  • The largest HEV ORF1 protein is not currently included in diagnostic testing formats.

Purpose of the Study:

  • To investigate the diagnostic potential of HEV ORF1 domains.
  • To compare the antigenic properties of novel HEV ORF1 domains with existing commercial HEV antigens.
  • To evaluate the impact of including ORF1 antigens on the sensitivity and specificity of HEV diagnostic assays.

Main Methods:

  • A complete HEV genotype 1 gene library with 15 ORF domains was constructed.
  • Nine recombinant HEV proteins were expressed and purified for serum profiling.
  • Serum profiling was performed using 55 patient sera on a microarray, with statistical analysis comparing HEV ORF domains to commercial antigens.

Main Results:

  • Recombinant HEV antigens demonstrated comparable quality to commercial ones.
  • ORF1 domains (Y, V, X) showed diagnostic significance comparable to ORF2 and ORF3 epitopes.
  • No significant increase in diagnostic sensitivity or specificity was observed; however, ORF3's C-terminal domain was linked to IgG/IgM seroreactivity.

Conclusions:

  • Identified ORF1 epitopes may broaden the quality of existing HEV test systems without necessarily improving sensitivity or specificity.
  • ORF2 and ORF3 antigens retain potential for differentiating HEV genotypes 1 and 3.
  • Systematic epitope screening of native viral domains is a viable method for developing new serologic test components.