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Evolutionary History of Life on Earth
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Evolutionary considerations in relating oligosaccharide diversity to biological function.

P Gagneux1, A Varki

  • 1Glycobiology Program and UCSD Cancer Center, Divisions of Hematology-Oncology and Cellular and Molecular Medicine,University of California San Diego, La Jolla, CA 92093-0687, USA.

Glycobiology
|July 16, 1999
PubMed
Summary
This summary is machine-generated.

Glycan diversity in multicellular organisms is driven by evolutionary pressures from pathogens. This explains the complexity of cell surface sugars and challenges in understanding their specific biological roles.

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Area of Science:

  • Glycobiology
  • Evolutionary Biology
  • Immunology

Background:

  • Oligosaccharide chains (glycans) on cell surfaces have vital biological functions.
  • The complexity and diversity of glycans remain poorly understood, with unclear evolutionary patterns.
  • Intraspecies glycan diversity often lacks obvious functional relevance.

Purpose of the Study:

  • To propose an explanation for the extensive diversity and complexity of glycans in multicellular organisms.
  • To investigate the evolutionary drivers behind glycan diversification.
  • To elucidate the roles of glycans in host-pathogen interactions.

Main Methods:

  • Comparative analysis of glycan diversity across species and within species.
  • Hypothesizing evolutionary selection pressures.
  • Literature review on host-pathogen interactions involving glycans.

Main Results:

  • Glycan diversification is influenced by both endogenous and exogenous evolutionary selection pressures.
  • Exogenous pressures, particularly from pathogens, appear to be a major driver of glycan diversity.
  • This diversity complicates the elucidation of specific endogenous glycan functions.

Conclusions:

  • Evolutionary selection pressures from pathogens significantly shape glycan diversity.
  • Understanding glycan functions requires considering their role in host-pathogen dynamics.
  • Further research is needed to fully unravel the interplay between glycan structure, function, and evolution.