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A unique T cell receptor discovered in marsupials.

Zuly E Parra1, Michelle L Baker, Ryan S Schwarz

  • 1Center for Evolutionary and Theoretical Immunology and Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 31, 2007
PubMed
Summary

Marsupials possess a novel T cell receptor (TCRmu) utilizing unique gene segments, distinct from those in placental mammals. This ancient receptor system may be present across various vertebrate lineages.

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Area of Science:

  • Immunology
  • Evolutionary Biology
  • Genetics

Background:

  • T cells use T cell receptors (TCRs) with diverse binding specificities, generated through gene segment recombination.
  • Conventional TCRs include alpha, beta, gamma, and delta chains, forming alphabeta or gammadelta heterodimers.
  • Marsupials represent a unique mammalian lineage with distinct immunological features.

Purpose of the Study:

  • To identify and characterize a novel T cell receptor (TCR) in marsupials.
  • To investigate the genetic basis and evolutionary origins of this new TCR.
  • To understand the expression patterns and potential functions of the marsupial TCR.

Main Methods:

  • Analysis of marsupial gene segments involved in T cell receptor assembly.
  • Investigation of somatic recombination and germ-line DNA configurations for TCR gene segments.
  • mRNA isoform analysis and expression profiling in thymus and spleen.
  • Comparative analysis with TCRs from other vertebrate species.

Main Results:

  • Discovery of a new T cell receptor, TCRmu, in marsupials, with unique V, D, and J gene segments.
  • TCRmu gene segments can be somatically recombined or prejoined in germ-line DNA, potentially via retrotransposition.
  • TCRmu exhibits homology to a shark TCRdelta isoform, suggesting an ancient origin.
  • Two dominant mRNA isoforms of TCRmu are expressed in marsupial thymus and spleen, with one prevalent in peripheral lymphoid tissue.

Conclusions:

  • Marsupials possess a distinct T cell receptor (TCRmu) utilizing prejoined gene segments, unlike eutherian mammals.
  • TCRmu's features suggest an ancient origin and potential presence in other vertebrate lineages.
  • This finding expands our understanding of T cell receptor evolution and diversity across mammals.