Genome Microevolution of Chikungunya Viruses in the Indian Ocean Outbreak
Author Information
Author(s): Isabelle Schuffenecker, Isabelle Iteman, Alain Michault, Séverine Murri, Lionel Frangeul, Marie-Christine Vaney, Rachel Lavenir, Nathalie Pardigon, Jean-Marc Reynes, François Pettinelli, Leon Biscornet, Laure Diancourt, Stéphanie Michel, Stéphane Duquerroy, Ghislaine Guigon, Marie-Pascale Frenkiel, Anne-Claire Bréhin, Nadège Cubito, Philippe Desprès, Frank Kunst, Félix A Rey, Hervé Zeller, Sylvain Brisse
Primary Institution: Institut Pasteur
Hypothesis
What are the unique molecular features and evolutionary history of chikungunya viruses during the Indian Ocean outbreak?
Conclusion
The chikungunya virus isolates from the Indian Ocean outbreak exhibit unique molecular features and high evolutionary potential.
Supporting Evidence
- The chikungunya virus outbreak infected about one-third of the population on Réunion Island.
- Unique molecular features were identified in the viral isolates, indicating their evolutionary success.
- Ten amino acid changes were found in the non-structural proteins of the virus.
- Changes in the E1 glycoprotein were linked to the virus's ability to adapt to mosquito vectors.
- Phylogenetic analysis showed that the Indian Ocean isolates form a distinct clade within the East, Central, and South African phylogroup.
Takeaway
Scientists studied the chikungunya virus from sick people in the Indian Ocean and found that it changed a lot, which helps explain why the outbreak was so big.
Methodology
The study involved sequencing the genomes of six chikungunya virus isolates and partial sequences from 121 patients across several islands.
Limitations
The study is limited by the number of isolates sequenced and the potential for sampling bias.
Participant Demographics
Patients were from Réunion, Seychelles, Madagascar, Mayotte, and Mauritius.
Digital Object Identifier (DOI)
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