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Related Experiment Videos

Interdependent MHC-DRB exon-plus-intron evolution in artiodactyls

F W Schwaiger1, E Weyers, J Buitkamp

  • 1Rhur University, Bochum, Germany.

Molecular Biology and Evolution
|March 1, 1994
PubMed
Summary
This summary is machine-generated.

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Sheep MHC-DRB exon 2 sequences reveal novel alleles and shared motifs, suggesting ancient origins and recombination shaped diversity. Positive selection maintained antigen-binding site variations.

Area of Science:

  • Immunogenetics
  • Molecular Evolution
  • Comparative Genomics

Background:

  • The Major Histocompatibility Complex (MHC) plays a crucial role in immune response.
  • MHC-DRB genes are highly polymorphic and essential for antigen presentation.
  • Understanding MHC evolution provides insights into species-specific immune adaptations.

Purpose of the Study:

  • To investigate polymorphisms in sheep MHC-DRB exon 2 and adjacent intronic regions.
  • To identify novel Ovar-DRB alleles and analyze their evolutionary relationships.
  • To compare sequence variation and evolutionary patterns with cattle and goats.

Main Methods:

  • Sequencing of exon 2 and flanking intronic regions of the Ovar-DRB locus.
  • Analysis of nucleotide and amino acid polymorphisms.

Related Experiment Videos

  • Comparative analysis of simple tandem repeat variations.
  • Phylogenetic analysis to infer evolutionary pathways.

    • Main Results:

    • Identification of 21 novel Ovar-DRB alleles.
    • Discovery of extensive sharing of short nucleotide motifs between alleles.
    • Reduced variation in simple repeats, amino acid diversity, and silent substitutions in sheep compared to cattle and goats.
    • Evidence of strong positive selection maintaining amino acid diversity at antigen-binding sites.
    • Division of DRB alleles into two groups with distinct substitution patterns, suggesting separate evolutionary trajectories.

    Conclusions:

    • Sheep Ovar-DRB evolution is characterized by a limited number of ancient alleles recombining via nucleotide motif exchange.
    • Positive selection drives the maintenance of functional diversity at antigen-binding sites.
    • Distinct evolutionary pathways exist for different DRB allele lineages within sheep, goats, and cattle.