Skip to main content
Log in

Macroevolution of avian T cell receptor C segments using genomic data

  • ORIGINAL ARTICLE
  • Published:
Immunogenetics Aims and scope Submit manuscript

Abstract

All jawed vertebrates have four T cell receptor (TCR) chains expressed by thymus-derived lymphocytes that play a significant role in animal immune defense. However, avian TCR studies have been limited to a few species, although their co-functional major histocompatibility complexes (MHCs) have been studied for decades, showing various copy numbers and polymorphisms. Here, using public genome data, we characterized the copy numbers, the phylogenic relationship and selection of T cell receptor complex (TCR-C) segments, and the genomic organization of TCR loci across birds. Various numbers of C segments were found in the TCRα/TCRδ, TCRβ, and TCRγ loci, and phylogenetic analysis reflected both ancient gene duplication events (two Cβ segments and Cδ segments divergent into CδI and CδII) and contemporary evolution (lineage-specific and species-specific characteristics). Most passerines lack CδII segments and a second TRD locus, except Meliphagidae and Maluridae. A relatively stable structure was verified in four TCR loci of birds, except for the arrangement of V segment groups. In this study, we explored the phylogenetic relationships of TCR-C segments across avians for the first time. We inferred gene duplication and loss events during the evolution process. The finding of diverse TCR germline repertoires provides a better understanding of the immune systems of birds.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4

Similar content being viewed by others

Data availability

All sequences are available in the public databases.

References

Download references

Funding

This work was supported by the “Pioneer” and “Leading Goose” R&D Program of Zhejiang (No. 2022C04014), Zhejiang Science and Technology Major Program on Agricultural New Variety Breeding (No. 2021C02068-10), National Natural Science Foundation of China (No. 32101243), and Sichuan and Technology Department of Sichuan Province (Grant No. 2022YFS0487).

Author information

Authors and Affiliations

Authors

Contributions

K. H., Y. Z., and A. Z. designed this study; C. L., L. S., Y. Z., and K. H. analyzed the data; C. L. and K. H. wrote the initial draft; all authors revised the draft for intellectual content and approved the final manuscript.

Corresponding author

Correspondence to Ke He.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Highlights

• First large-scale and comprehensive analysis of TCR in birds.

• Ancient gene duplication events in Cβ segments and Cδ segments.

• Provides evidence for loss of a second TRD locus in the CδII fragment in most passerines.

Supplementary Information

Rights and permissions

Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Liang, C., Sun, L., Zhu, Y. et al. Macroevolution of avian T cell receptor C segments using genomic data. Immunogenetics 75, 531–541 (2023). https://doi.org/10.1007/s00251-023-01322-8

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00251-023-01322-8

Keywords

Navigation