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Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
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Enzyme evolution beyond gene duplication: A model for incorporating horizontal gene transfer.

Lianet Noda-García1, Francisco Barona-Gómez

  • 1Evolution of Metabolic Diversity Laboratory; Laboratorio Nacional de Genómica para la Biodiversidad (Langebio); Cinvestav-IPN; Irapuato, México.

Mobile Genetic Elements
|November 20, 2013
PubMed
Summary

Horizontal gene transfer (HGT) drives enzyme specialization and metabolic network evolution in bacteria. This study proposes a new model for enzyme evolution independent of gene duplication.

Keywords:
enzyme evolutionhorizontal gene transfersubHisA and PriAsubstrate specificitytryptophan and histidine biosynthesis

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Area of Science:

  • Evolutionary biology
  • Biochemistry
  • Genomics

Background:

  • Gene duplication has historically been the primary focus for understanding enzyme evolution and functional redundancy.
  • The role of horizontal gene transfer (HGT) in enzyme specialization and metabolic network assembly is an emerging area of research.
  • Traditional enzyme studies often rely on in vitro function or population-level sequence variability.

Purpose of the Study:

  • To investigate the impact of HGT on enzyme specialization.
  • To characterize the sub-functionalization of an amino acid biosynthetic enzyme following HGT in bacteria.
  • To propose a model for enzyme specialization independent of gene duplication.

Main Methods:

  • Comparative phylogenomics
  • Detection of selection signals
  • Enzyme kinetics
  • X-ray crystallography
  • Computational molecular dynamics

Main Results:

  • Characterization of sub-functionalization in an amino acid biosynthetic enzyme.
  • Demonstration of enzyme specialization driven by HGT.
  • Evidence supporting a model of enzyme evolution independent of gene duplication.

Conclusions:

  • Horizontal gene transfer (HGT) plays a significant role in the evolution of enzyme function and metabolic networks.
  • Enzyme specialization can occur independently of gene duplication.
  • This study offers a new perspective on evolutionary mechanisms shaping enzyme diversity.