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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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The Enigma of Hepatitis E Virus.

Liza Bronner Murrison1, Kenneth E Sherman1

  • 1Dr Bronner Murrison is an assistant professor in the Division of Public Health Sciences and Dr Sherman is a professor of medicine in the Division of Digestive Diseases at the University of Cincinnati College of Medicine in Cincinnati, Ohio.

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Hepatitis E virus (HEV) is a common cause of acute viral hepatitis, often unrecognized in industrialized nations. Increased awareness and diagnosis are crucial for managing this underestimated global health burden.

Keywords:
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Area of Science:

  • Hepatology
  • Infectious Diseases
  • Public Health

Background:

  • Hepatitis E virus (HEV) is the leading cause of acute viral hepatitis globally.
  • HEV is endemic in developing nations but increasingly recognized in industrialized countries.
  • HEV is often misdiagnosed or unidentified due to varied presentations and genotypes.

Purpose of the Study:

  • To highlight the underestimation of HEV's global prevalence and clinical significance.
  • To emphasize the need for improved diagnostic capabilities and clinical awareness of HEV.
  • To underscore the implications of accurate HEV diagnosis for patient management and public health.

Main Methods:

  • Review of recent seroprevalence data from industrialized, nonendemic countries.
  • Analysis of diagnostic challenges and clinical underrecognition of HEV.
  • Examination of HEV genotype variations and epidemiological differences.

Main Results:

  • Modern serological assays reveal a high prevalence of anti-HEV antibodies in industrialized nations.
  • Many HEV infections in these settings are subclinical or unrecognized.
  • Existing data suggest a significant underestimation of HEV's global burden and seroprevalence.

Conclusions:

  • Enhanced capacity for HEV recognition and diagnosis is critical worldwide.
  • Improved clinical awareness can reduce the burden of HEV infection.
  • Accurate diagnosis impacts patient care, disease control, and understanding transmission dynamics.