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Evidence for recombination in Crimean-Congo hemorrhagic fever virus

Alexander N Lukashev1

  • 1Institute of Poliomyelitis and Viral Encephalitides RAMS, Moscow 142782, Russia.

The Journal of General Virology
|July 22, 2005
PubMed

Insights

Recombination events were detected in Crimean-Congo hemorrhagic fever (CCHF) virus S segments, suggesting complex viral evolution. Caution is advised when analyzing CCHF virus phylogeny using limited sequence data due to potential reassortment and recombination.

Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Crimean-Congo hemorrhagic fever (CCHF) virus is a significant public health concern.
  • Phylogenetic studies of CCHF virus are crucial for understanding its evolution and spread.
  • Previous studies often relied on partial RNA segments, potentially limiting accuracy.

Purpose of the Study:

  • To investigate recombination events within full-length S, M, and L RNA segments of CCHF virus.
  • To assess the impact of recombination on CCHF virus phylogenetic analyses.
  • To provide insights into the evolutionary dynamics of CCHF virus.

Main Methods:

  • Analysis of full-length S, M, and L RNA segments of CCHF virus.
  • Application of similarity plots and bootscan analysis for recombination detection.
  • Utilized phylogenetic trees, hidden Markov models, and probabilistic divergence measures.

Main Results:

  • Multiple recombination events were identified in the S segment of CCHF virus strains from Europe, Asia, and Africa.
  • Phylogenetic trees and other methods corroborated the evidence for S segment recombination.
  • No definitive recombination signs were found in M and L segments, though not entirely excluded.
  • Recent reports indicate reassortment in CCHF virus.

Conclusions:

  • Recombination is a significant factor in the evolution of the CCHF virus S segment.
  • Phylogenetic assessments of CCHF virus based on short fragments may be unreliable.
  • Findings highlight the complexity of CCHF virus evolution and the need for comprehensive sequence data.

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