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Printable Handouts
Navigable Slide Index
- Introduction
- All pathogenic microorganisms
- Between recombination and clonality
- Main publications
- Goal (1)
- There is always a common denominator
- Neo-Pasteurian era
- Looking for the common denominator (1)
- Looking for the common denominator (2)
- Common denominator among pathogens
- Clonal evolution restrained genetic recombination
- Clonality definition
- PCE = salami slicing model
- No PCE – frequent recombination
- Predominant clonal evolution
- Recombinational load
- The PCE concept
- A gynogenetic fish that mates, but is clonal
- Recombination does not break the PCE pattern
- 3 main (linked) manifestations
- Linkage disequilibrium: restrained recombination
- Near-clading: what is it?
- Congruence parameters
- Clonality threshold
- Different names given to microbe genetic clusters
- Near-clade
- Paleo-data mining
- Caution with population genetics tests
- “Evolutionary twins”
- Parity between phylogenetic trees (1)
- Multilocus Sequence Typing (MLST)
- Giardia: “assemblages” and “subassemblages”
- T. gondii isolates comprise six major clades
- The Cryptococcus neoformans complex
- E. coli - the “bacterial evolutionary twin” of T. cruzi
- Animal and human pathogenic E. coli strains
- Second step: the “Russian doll” model
- Slicing of salami slicing model
- The “Russian doll” model (1)
- The “Russian doll” model (2)
- Parity between phylogenetic trees (2)
- Lesser near-clades Within T. cruzi near-clade 1
- The “Russian doll” model (3)
- Micro-clustering within the S. typhi H58 clade
- Neisseria meningitidis is structured into clades
- Near-clades are observed in Leishmania donovani
- Viruses and clonality
- Dengue virus: Katzelnick et al., 2016
- Practical implications of the PCE approach
- Goal (2)
- The clonet concept
- Example 1
- Example 2
- Revisiting the phylogenetic species concept (1)
- Revisiting the phylogenetic species concept (2)
- Applying the PCE approach to a given species (1)
- Applying the PCE approach to a given species (2)
- Contact details
Topics Covered
- Recombination vs. clonality
- Neo-Pasteurian era
- Looking for the common denominator among parasitic protozoa, fungi, bacteria and viruses
- PCE = salami slicing model
- No PCE – frequent recombination: soup model
- Recombinational load
- The PCE concept
- Linkage disequilibrium: restrained recombination
- Near-clading
- Parity between phylogenetic trees
- Multilocus Sequence Typing (MLST)
- The “Russian doll” model
- Practical implications of the PCE approach
- The clonet concept
- Revisiting the phylogenetic species concept (PSC)
- Applying the PCE approach to a given species
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Talk Citation
Tibayrenc, M. (2018, April 30). The predominant clonal evolution (PCE) concept of microbial pathogens and its practical usefulness [Video file]. In The Biomedical & Life Sciences Collection, Henry Stewart Talks. Retrieved November 23, 2024, from https://doi.org/10.69645/UFJN6338.Export Citation (RIS)
Publication History
Financial Disclosures
- Dr. Michel Tibayrenc has not informed HSTalks of any commercial/financial relationship that it is appropriate to disclose.
The predominant clonal evolution (PCE) concept of microbial pathogens and its practical usefulness
A selection of talks on Microbiology
Transcript
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0:00
The work presented here is a result of a long-term collaboration
started in the early '80s with Professor Francisco J. Ayala,
University of California Irvine.
0:13
The predominant clonal evolution of parch is of
interest to all kinds of pathogenic microorganisms.
Eukaryotic, parasitic protozoa and fungi; prokaryotic,
bacteria and viruses of medical veterinary or agronomical relevance.
0:32
The so-called clonality sexuality debate started in the late '70s.
This literature is littered with
imprecise subjective assertions such as strong influence of recombination,
far from being a clonal species,
extensive genetic exchange which are both informative.
The PCE approach aims at settling clear cut
criteria to distinguish between sexuality and clonality.
1:01
This research led to the publication of more than 200 international papers.
I will briefly present the main ones here.
The program started in 1980,
when I was in Bolivia studying Trypanosoma cruzi,
the parasite responsible for Chagas disease.
This disease ranges from Southern USA to Northern Argentina and causes,
between others, severe cardiac insufficiencies.
The progress of modern genomics,
whole genome sequencing and massive single
nucleotide polymorphism yielded a flood of published data.
This made it possible to considerably refine the model until its present states.
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