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November 27, 2023Acta VirologicaOpen Access

Evolution of rat hepatitis E virus: recombination, divergence and codon usage bias

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Key result

Rat hepatitis E virus began expanding around 1956 and evolves at a high rate.

  • n=149

Why the study?

Rat hepatitis E virus is an emerging zoonotic pathogen posing an increasing threat to public health worldwide, requiring a better understanding of its epidemiology and evolution.

Population

Rat hepatitis E virus isolates sampled so far

Design

Phylogeographic, recombination, Bayesian coalescent, and codon usage bias analysis

Authors

LZLiang ZhaoYHYangmei Huang

Discussion

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Overview

Supports zoonotic surveillance for RHEV; leaves open its human transmission risk and need for prospective studies.

Structured PICO

P
Population
149 unique genomic sequences of rat hepatitis E virus collected between 2007 and 2020 analyzed for evolutionary divergence and codon usage bias.

RHEV is an emerging zoonotic pathogen that began expanding around 1956, evolves at a high rate, and exhibits unique codon usage biases compared to its host.

Limitations

  • Sampling bias is present in the available sequences from GenBank.
  • Cannot assert whether some recombination events occurred naturally as the chimeric isolates were sequenced in the same lab.
  • Origin of RHEV cannot be safely inferred from the current phylogeography due to a lack of sequence information in certain regions.

Cite This Study

Zhao et al. (2023) studied Rat hepatitis E virus (RHEV) (n=149). Genomic and phylogenetic analysis was evaluated. Bayesian coalescent analysis of 149 rat hepatitis E virus sequences revealed that the virus began to expand around 1956 and evolves at a high rate of 1.06 × 10^-2 substitutions/site/year.

synapsesocial.com/papers/6a9d8a99671a753206579468https://doi.org/10.3389/av.2023.12031
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