Cited by 37Genomics and Phylogenetic StudiesTuberculosis Research and EpidemiologyGenetic diversity and population structure

Recombination Signal in Mycobacterium tuberculosis Stems from Reference-guided Assemblies and Alignment Artefacts

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Godfroid, Maxime, Dagan, Tal, Kupczok, Anne·2018·Genome Biology and Evolution

Abstract

DNA acquisition via genetic recombination is considered advantageous as it has the potential to bring together beneficial mutations that emerge independently within a population. Furthermore, recombination is considered to contribute to the maintenance of genome stability by purging slightly deleterious mutations. The prevalence of recombination differs among prokaryotic species and depends on the accessibility of DNA transfer mechanisms. An exceptional example is the human pathogen Mycobacterium tuberculosis (MTB) where no clear transfer mechanisms have been so far characterized and the presence of recombination is questioned. Here, we analyze completely assembled MTB genomes in search for evidence of recombination. We find that putative recombination events are enriched in strains reconstructed by reference-guided assembly and in regions with unreliable alignments. In addition, assembly and alignment artefacts introduce phylogenetic signals that are conflicting the established MTB phylogeny. Our results reveal that the so far reported recombination events in MTB are likely to stem from methodological artefacts. We conclude that no reliable signal of recombination is observed in the currently available MTB genomes. Moreover, our study demonstrates the limitations of reference-guided genome assembly for phylogenetic reconstructions. Rigorously de novo assembled genomes of high quality are mandatory in order to distinguish true evolutionary signal from noise, in particular for low diversity species such as MTB.

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Crossref · 10.1093/gbe/evy143

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  • In contrast to M. canettii strains, DNA transfer between M. tuberculosis strains was not observed despite numerous trials, emphasizing the clonal population structure of M. tuberculosis strains.

    “In contrast to M. canettii strains, DNA transfer between M. tuberculosis strains was not observed despite numerous trials (55), emphasizing the clonal population structure of M. tuberculosis strains (58,59).”

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  1. Bryant J. 2014 Evolutionary genomics of pathogenic mycobacteria. Cambridge: PhD thesis, University of Cambridge.

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Authors
Godfroid, M., Dagan, T., & Kupczok, A.
Affiliations
Christian-Albrechts-Universität zu Kiel (DE)
Corresponding author
  • Godfroid, Maxime
  • Kupczok, Anne
Venue
Genome Biology and Evolution
Published
2018-07-13
Volume
10
Issue
8
Pages
1920-1926
ISSN
1759-6653 (ISSN-L)
OpenAlex
W2884219632
Cited by
37
References
55
Citations by year
2026: 1 · 2025: 4 · 2024: 8 · 2023: 4 · 2022: 5 · 2021: 7 · 2020: 5 · 2019: 3
FWCI
1.33
Type
journal article
Language
en
Open access
Locations
  • Genome Biology and Evolution (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
European Research Council (281357)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
Keywords
Mycobacterium tuberculosis, genetic recombination, phylogenetic signal, genome stability, de novo genome assembly, recombination detection
MeSH terms
Mycobacterium tuberculosis, Phylogeny, Recombination, Genetic, Reference Standards, Sequence Alignment, Artifacts, Genome, Bacterial

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