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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Misinterpretation of Schmallenberg virus sequence variations: the sample material makes the difference.

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Sequence variability in Schmallenberg virus (SBV) appears higher in sheep than cattle due to biased sample selection. Fetal and newborn lamb samples do not represent circulating SBV strains.

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Area of Science:

  • Virology and Molecular Epidemiology
  • Orthobunyavirus research
  • Ruminant infectious diseases

Background:

  • Previous studies suggested higher M-segment sequence variability of Schmallenberg virus (SBV) in sheep compared to cattle.
  • This hypothesis was based on analyses of publicly available sequence data.
  • SBV is an orthobunyavirus of significant concern in ruminant populations.

Discussion:

  • The interpretation of SBV sequence variability is heavily influenced by the origin of the analyzed samples.
  • Cattle-derived sequences predominantly come from blood of acutely infected animals.
  • Ovine sequences largely originate from malformed fetuses or newborn lambs, which are not representative of actively circulating SBV.

Key Insights:

  • Observed higher sequence variability in ovine SBV strains is likely an artifact of sample type.
  • Samples from malformed fetuses and lambs do not accurately reflect the genetic diversity of circulating SBV.
  • Re-evaluation of SBV molecular epidemiology requires analysis of appropriate sample types from infected ruminants.

Outlook:

  • Future molecular epidemiology studies should prioritize samples from acutely infected animals in both cattle and sheep.
  • Accurate assessment of SBV genetic diversity is crucial for understanding viral evolution and transmission dynamics.
  • This revised understanding will aid in developing more effective control strategies against SBV outbreaks in ruminants.