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Detecting recombination in TT virus: a phylogenetic approach
Franz Manni1, Antonella Rotola, Elisabetta Caselli
1Laboratoire d'Anthropologie Biologique (CNRS FRE 2292), Musée de I'Homme MNHN, 17 Place du Trocadéro, 75016 Paris, France. manni@mnhn.fr
Journal of Molecular Evolution
|October 26, 2002
Summary
TT virus (TTV) exhibits significant genetic diversity due to frequent recombination, not clonal transmission. Phylogenetic analysis reveals recombination shapes TTV evolution and explains its genetic divergence and lack of global structure.
Area of Science:
- * Virology
- * Molecular Evolution
- * Phylogenetics
Background:
- * Torque teno virus (TTV) displays remarkable genetic heterogeneity.
- * Understanding TTV evolution requires robust phylogenetic methods.
Purpose of the Study:
- * To investigate the evolutionary mechanisms driving TTV genetic diversity.
- * To analyze phylogenetic discrepancies between DNA and protein sequences.
- * To identify the role of homoplasy and recombination in TTV evolution.
Main Methods:
- * Phylogenetic analyses of 739 TTV DNA sequences from the N22 region of ORF1.
- * Construction of neighbor-joining consensus trees and median-joining networks.
- * Statistical analysis to assess homoplasy and recombination events.
Main Results:
- * Significant differences observed between DNA and protein phylogenies.
- * Homoplasy, indicative of recombination, biases DNA sequence analysis.
- * Frequent recombination among closely related TTV strains detected, explaining high divergence and lack of global population structure.
Conclusions:
- * TTV transmission is non-clonal, driven by frequent recombination.
- * Recombination is a key factor in TTV genetic divergence and population dynamics.
- * Phylogenetic analysis can detect recombination even in short sequences with large datasets.