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Related Experiment Videos

A human-specific gene in microglia.

Toshiyuki Hayakawa1, Takashi Angata, Amanda L Lewis

  • 1Glycobiology Research and Training Center, University of California at San Diego, La Jolla, CA 92093, USA.

Science (New York, N.Y.)
|September 10, 2005
PubMed
Summary
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Human SIGLEC11 evolved via gene conversion, altering sialic acid (Sia) binding and brain microglia expression. This human-specific adaptation may offer insights into human evolution and Sia biology.

Area of Science:

  • Evolutionary biology
  • Genomics
  • Immunology

Background:

  • Significant differences exist in sialic acid (Sia) biology between humans and apes, particularly concerning Siglecs (Sia-recognizing-Ig-superfamily lectins).
  • Previous research highlights variations in Sia-related genes and their functions across species.

Purpose of the Study:

  • To investigate the evolutionary origins of the human SIGLEC11 gene and its functional implications.
  • To understand the role of SIGLEC11 in human-specific adaptations, particularly in the brain.

Main Methods:

  • Comparative genomics analysis of human and chimpanzee genomes.
  • Gene conversion analysis to identify evolutionary events.
  • Biochemical assays to assess Sia-binding properties of the human SIGLEC11 protein.

Related Experiment Videos

  • Immunohistochemical analysis of SIGLEC11 expression in human and chimpanzee brain tissue.

    • Main Results:

    • The human SIGLEC11 gene originated from a human-specific gene conversion event involving an adjacent pseudogene.
    • This conversion affected the 5' untranslated region and the Sia-recognition domain, resulting in a protein with altered Sia-binding characteristics.
    • The human SIGLEC11 protein exhibits reduced binding compared to its ancestral form but specifically recognizes oligosialic acids, which are abundant in the brain.
    • SIGLEC11 is expressed in human brain microglia but not in chimpanzee brain microglia.

    Conclusions:

    • The human-specific evolution of SIGLEC11 represents a significant adaptation in Sia biology.
    • The altered binding properties and brain-specific expression suggest a potential role in human neurological functions or evolution.
    • Further research is warranted to elucidate the precise functional significance of human SIGLEC11 in the context of Homo evolution.