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Evidence for phylogenetic inheritance in pathogenicity of Mycobacterium
M C Leclerc1, F Thomas, J F Guégan
1Centre d'Etudes sur le Polymorphisme des Micro-Organismes CEPM/UMR CNRS-IRD 9926, IRD, 911 Avenue Agropolis, B.P. 5045, 34032 Montpellier Cedex 1, France.
Antonie Van Leeuwenhoek
|June 5, 2003
Summary
Mycobacterial pathogenicity is primarily inherited through phylogeny, not ecological factors. The most harmful species are linked to diverse habitats but this association disappears when evolutionary history is considered.
Area of Science:
- Evolutionary biology
- Microbiology
- Genomics
Background:
- Mycobacteria exhibit varying pathogenicity levels.
- Understanding adaptive and phylogenetic constraints is crucial for mycobacterial research.
Purpose of the Study:
- To investigate adaptive and phylogenetic constraints in mycobacterial pathogenicity.
- To analyze the relationship between ecological factors, phylogenetic relationships, and pathogenicity levels in Mycobacteria.
Main Methods:
- Phylogenetic analysis of 64 Mycobacteria taxa using cladistics.
- Comparative analysis incorporating ecological factors and phylogenetic relationships.
- Generalized Linear Mixed-Effects (GLIM) modelling and independent contrast analysis.
Main Results:
- GLIM modelling suggested ecological and phylogenetic factors influence pathogenicity variation.
- Highly pathogenic species were associated with more diverse habitats.
- Independent contrast analysis revealed pathogenicity is phylogenetically inherited, independent of ecological factors.
- The most pathogenic strains were identified within the slow-growing/long helix 18 group, specifically in more derived taxa.
Conclusions:
- Phylogenetic inheritance is the dominant factor in mycobacterial pathogenicity.
- Ecological factors do not independently predict pathogenicity once evolutionary history is accounted for.
- Pathogenicity in Mycobacteria is a conserved trait shaped by evolutionary history.