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Related Experiment Videos

HLA-G polymorphism and evolution.

A Arnaiz-Villena1, J Martinez-Laso, J I Serrano-Vela

  • 1Department of Immunology, The Madrid Regional Blood Center, Universidad Complutense, Madrid, Spain. aarnaiz@med.ucm.es

Tissue Antigens
|April 21, 2007
PubMed
Summary
This summary is machine-generated.

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Human leukocyte antigen (HLA)-G diversity varies across primates, with New World monkeys exhibiting unique MHC-G gene characteristics suggesting non-orthologous evolution and distinct functions compared to Old World primates.

Area of Science:

  • Immunogenetics
  • Primate evolutionary biology
  • Molecular genetics

Background:

  • Human leukocyte antigen (HLA)-G is a non-classical MHC class I molecule with a known diversity of alleles in humans.
  • Previous studies have characterized HLA-G allele diversity in various primate species, revealing significant interspecies variation.

Purpose of the Study:

  • To investigate the genetic diversity and evolutionary characteristics of the major histocompatibility complex (MHC)-G gene across different primate lineages.
  • To compare MHC-G gene sequences and identify potential functional differences between New World and Old World primates.

Main Methods:

  • Comparative genomic analysis of MHC-G gene sequences from humans, great apes (bonobo, chimpanzee, gorilla, orangutan), Old World monkeys (Cercopithecus, Macaca), and New World monkeys (Cotton-top tamarin).

Related Experiment Videos

  • Identification and characterization of alleles, including DNA and protein variations.
  • Phylogenetic analysis to infer evolutionary relationships and identify potential orthology or non-orthology.

    • Main Results:

    • Humans exhibit six proteins, one null allele, and 22 HLA-G alleles. Great apes show limited diversity (1-5 alleles), while orangutans have five.
    • Old World monkeys, including Macaca and Cercopithecus species, possess alleles with stop codons at position 164.
    • New World monkeys (Cotton-top tamarin) display extensive DNA and protein allele diversity (20 alleles) and possess MHC-G sequences resembling MHC-E, lacking the typical primate intron 2-specific deletion.

    Conclusions:

    • The MHC-G gene in New World primates appears non-orthologous to that of Old World primates and humans.
    • The unique characteristics of New World primate MHC-G suggest a functional divergence, potentially aligning with classical antigen-presenting MHC genes rather than non-classical HLA-G functions.