NDLI: Diversity and evolution of T-cell receptor variable region genes in mammals and birds

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Immunogenetics : Volume 50, Issue 3-4, November 1999

Immunogenetics : Volume 50, Issue 1-2, October 1999

Immunogenetics : Volume 49

Immunogenetics : Volume 48

Immunogenetics : Volume 47

Immunogenetics : Volume 46

Immunogenetics : Volume 45

Diversity and evolution of T-cell receptor variable region genes in mammals and birds

Content Provider	Springer Nature Link
Author	Su, C. Jakobsen, I. Gu, X. Nei, M.
Copyright Year	1999
Abstract	The receptor of a T lymphocyte (TCR) recognizes nonself antigens in the company of major histocompatibility complex (MHC) molecules presented to it by the antigen-presenting cell. The variable region of TCR is encoded by either a concatenation of variable region (TCR-V), diversity region (TCR-D), and joining region (TCR-J) genes, or a concatenation of TCR-V and TCR-J genes. The TCR-V genes exist as a multigene family in vertebrate species. Here we study the evolutionary relationships of TCR-V genes from humans, sheep, cattle, rabbits, mice, and chicken. These six species can be classified into two groups according to the frequency of γδ T-cells in their peripheral T-cell populations. The "γδ low" group of species includes humans and mice, in which γδ T-cells constitute very limited portion of the T-cell population. The "γδ high" group includes sheep, cattle, rabbits, and chicken, in which γδ T-cells comprise up to 60% of the T-cell population. Here, we compiled TCR-V sequences from the six species and conducted a phylogenetic analysis. We identified various TCR-V gene subgroups based on the analysis. We found that humans and mice have representatives from nearly all of the subgroups identified, while other species have lost subgroups to different extent. Therefore, the γδ low species have a high degree of diversity of TCR-V genes, while γδ high species all have limited diversity of TCR-V genes. This pattern is similar to that found for immunoglobulin variable region (IGV) genes.
Starting Page	301
Ending Page	308
Page Count	8
File Format	PDF
ISSN	00937711
Journal	Immunogenetics
Volume Number	50
Issue Number	5-6
e-ISSN	14321211
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-12-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Immunology

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