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Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...
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Modularized evolution in archaeal methanogens phylogenetic forest.

Jun Li1, Chi-Fat Wong2, Mabel Ting Wong3

  • 1School of Biological Sciences, Faculty of Science, The University of Hong Kong, China.

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Summary
This summary is machine-generated.

Methanogens, crucial methane-producers, have complex evolutionary histories shaped by extensive horizontal gene transfer (HGT). Their phylogenetic forest reveals modular evolution, blending vertical inheritance with frequent gene exchanges.

Keywords:
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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • Methanogens are vital archaea in the global carbon cycle, but their evolutionary past is unclear due to horizontal gene transfer (HGT).
  • Previous studies using different genetic markers yielded conflicting evolutionary histories for methanogens and related archaea.

Purpose of the Study:

  • To resolve the evolutionary history of methanogens by analyzing coevolved gene clusters and phylogenetic structures.
  • To investigate the impact of horizontal gene transfer (HGT) on methanogen evolution and genome composition.

Main Methods:

  • Analysis of 3,694 gene families from 41 methanogens and 33 related archaea.
  • Reconstruction of coevolutionary gene networks and hierarchical phylogenetic structures.
  • Comprehensive evolutionary and network analyses to identify gene transfer events.

Main Results:

  • Over 50% of genes showed topological dissonance, indicating complex evolutionary paths.
  • Prevalent interorder HGTs, including in core genes, scrambled phylogenetic relationships.
  • Most methanogenesis genes and over 20% of total genes in methanogen genomes involved HGT, frequently from cell-wall synthesis and defense systems.
  • Seven robust coevolutionary modules were identified, with a central module containing core genes.

Conclusions:

  • Methanogen evolution is characterized by a modular phylogenetic forest, reflecting a combination of vertical inheritance and significant horizontal gene transfer.
  • The study highlights the pervasive influence of HGT on methanogen genomes and their evolutionary trajectories.
  • Modular evolution is linked to gene transfer rates and vertical evolutionary signals, shaping diverse pan-genome structures.