Human gamma delta T cells: Evolution and ligand recognition

  • Adams E
  • Gu S
  • Luoma A
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Abstract

The γδ T cell lineage in humans remains much of an enigma due to the low number of defined antigens, the non-canonical ways in which these cells respond to their environment and difficulty in tracking this population in vivo. In this review, we survey a comparative evolutionary analysis of the primate V, D and J gene segments and contrast these findings with recent progress in defining antigen recognition by different populations of γδ T cells in humans. Signatures of both purifying and diversifying selection at the Vδ and Vγ gene loci are placed into context of Vδ1+ γδ T cell recognition of CD1d presenting different lipids, and Vγ 9Vδ2 T cell modulation by pyrophosphate-based phosphoantigens through the butyrophilins BTN3A. From this comparison, it is clear that co-evolution between γδ TCRs and these ligands is likely occurring, but the diversity inherent in these recombined receptors is an important feature in ligand surveillance.

Author-supplied keywords

  • B30.2
  • Butyrophilin
  • CD1d
  • Phosphoantigens
  • T cell receptor
  • T cells
  • Vdelta1
  • Vgamma9Vdelta2

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