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Biology wars: the eukaryotes strike back.

Julie C Dunning Hotopp1, Anne M Estes2

  • 1Institute for Genome Sciences, School of Medicine, University of Maryland, Baltimore, Baltimore, MD 21201, USA; Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, Baltimore, MD 21201, USA.

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Eukaryotes gain bacterial genes via horizontal gene transfer (HGT). Studies show HGT of bacterial tae and lysozyme genes to eukaryotes and archaea, potentially aiding their defense against microbes.

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Area of Science:

  • Microbiology
  • Genetics
  • Evolutionary Biology

Background:

  • Eukaryotes can acquire genetic material and functions from bacteria through horizontal gene transfer (HGT).
  • Understanding the extent and implications of HGT is crucial for comprehending eukaryotic evolution and host-microbe interactions.

Purpose of the Study:

  • To investigate instances of horizontal gene transfer (HGT) involving bacterial genes in eukaryotic and archaeal genomes.
  • To identify specific bacterial genes, such as tae and lysozyme, that have been transferred to diverse hosts.
  • To explore the potential functional significance of these acquired genes in the recipient organisms' response to bacteria.

Main Methods:

  • Comparative genomics analysis to identify genes of bacterial origin in eukaryotic and archaeal genomes.
  • Phylogenetic analysis to trace the evolutionary history and transfer events of specific genes.
  • Bioinformatic tools to assess the functional domains and potential roles of transferred genes.

Main Results:

  • Identification of multiple horizontal gene transfer (HGT) events involving bacterial tae and lysozyme genes.
  • Demonstration of the transfer of these bacterial genes to a variety of eukaryotic and archaeal hosts.
  • Evidence suggesting that the acquired bacterial genes may enhance the host's ability to respond to bacterial challenges.

Conclusions:

  • Horizontal gene transfer (HGT) is a significant mechanism for eukaryotes and archaea to acquire novel genetic material and functions from bacteria.
  • The transfer of bacterial tae and lysozyme genes represents a notable example of HGT with potential adaptive advantages for the hosts.
  • These findings highlight the dynamic nature of genomes and the role of HGT in shaping host defense mechanisms and evolutionary trajectories.