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T cell receptor gamma locus
Symbols TRG@ ; TCRG; TRG
External IDs Template:OMIM5
Template:GNF Ortholog box
Species Human Mouse
Entrez n/a n/a
Ensembl n/a n/a
UniProt n/a n/a
RefSeq (mRNA) n/a n/a
RefSeq (protein) n/a n/a
Location (UCSC) n/a n/a
PubMed search n/a n/a

T cell receptor gamma locus, also known as TRG@, is a human gene.[1]

T cell receptors recognize foreign antigens which have been processed as small peptides and bound to major histocompatibility complex (MHC) molecules at the surface of antigen presenting cells (APC). Each T cell receptor is a dimer consisting of one alpha and one beta chain or one delta and one gamma chain. In a single cell, the T cell receptor loci are rearranged and expressed in the order delta, gamma, beta, and alpha. If both delta and gamma rearrangements produce functional chains, the cell expresses delta and gamma. If not, the cell proceeds to rearrange the beta and alpha loci. This region represents the germline organization of the T cell receptor gamma locus. The gamma locus includes V (variable), J (joining), and C (constant) segments. During T cell development, the gamma chain is synthesized by a recombination event at the DNA level joining a V segment with a J segment; the C segment is later joined by splicing at the RNA level. Recombination of many different V segments with several J segments provides a wide range of antigen recognition. Additional diversity is attained by junctional diversity, resulting from the random addition of nucleotides by terminal deoxynucleotidyltransferase. Several V segments of the gamma locus are known to be incapable of encoding a protein and are considered pseudogenes. Somatic rearrangement of the gamma locus has been observed in T cells derived from patients with T cell leukemia and ataxia telangiectasia.[1]


  1. 1.0 1.1 "Entrez Gene: TRG@ T cell receptor gamma locus".

Further reading

  • Lefranc MP, Rabbitts TH (1991). "Genetic organization of the human T cell receptor gamma locus". Curr. Top. Microbiol. Immunol. 173: 3–9. PMID 1655357.
  • Lefranc MP, Rabbitts TH (1989). "The human T-cell receptor gamma (TRG) genes". Trends Biochem. Sci. 14 (6): 214–8. PMID 2527426.
  • Lefranc MP, Chuchana P, Dariavach P; et al. (1989). "Molecular mapping of the human T cell receptor gamma (TRG) genes and linkage of the variable and constant regions". Eur. J. Immunol. 19 (6): 989–94. PMID 2526744.
  • Lefranc MP, Forster A, Rabbitts TH (1987). "Genetic polymorphism and exon changes of the constant regions of the human T-cell rearranging gene gamma". Proc. Natl. Acad. Sci. U.S.A. 83 (24): 9596–600. PMID 2879283.
  • Yoshikai Y, Toyonaga B, Koga Y; et al. (1987). "Repertoire of the human T cell gamma genes: high frequency of nonfunctional transcripts in thymus and mature T cells". Eur. J. Immunol. 17 (1): 119–26. PMID 2949984.
  • Tighe L, Forster A, Clark DM; et al. (1988). "Unusual forms of T cell gamma mRNA in a human T cell leukemia cell line: implications for gamma gene expression". Eur. J. Immunol. 17 (12): 1729–36. PMID 2961573.
  • Huck S, Lefranc MP (1988). "Rearrangements to the JP1, JP and JP2 segments in the human T-cell rearranging gamma gene (TRG gamma) locus". FEBS Lett. 224 (2): 291–6. PMID 2961609.
  • Huck S, Dariavach P, Lefranc MP (1988). "Variable region genes in the human T-cell rearranging gamma (TRG) locus: V-J junction and homology with the mouse genes". EMBO J. 7 (3): 719–26. PMID 2969332.
  • Littman DR, Newton M, Crommie D; et al. (1987). "Characterization of an expressed CD3-associated Ti gamma-chain reveals C gamma domain polymorphism". Nature. 326 (6108): 85–8. doi:10.1038/326085a0. PMID 3102973.
  • Dialynas DP, Murre C, Quertermous T; et al. (1986). "Cloning and sequence analysis of complementary DNA encoding an aberrantly rearranged human T-cell gamma chain". Proc. Natl. Acad. Sci. U.S.A. 83 (8): 2619–23. PMID 3458221.
  • Essand M, Vasmatzis G, Brinkmann U; et al. (1999). "High expression of a specific T-cell receptor gamma transcript in epithelial cells of the prostate". Proc. Natl. Acad. Sci. U.S.A. 96 (16): 9287–92. PMID 10430935.
  • Allison TJ, Winter CC, Fournié JJ; et al. (2001). "Structure of a human gammadelta T-cell antigen receptor". Nature. 411 (6839): 820–4. doi:10.1038/35081115. PMID 11459064.
  • Uthoff SM, Hunt LE, Grant BS; et al. (2002). "T-cell receptor gamma: a microsatellite marker for colorectal cancer". Ann. Surg. Oncol. 9 (1): 88–93. PMID 11833498.
  • Bartkowiak J, Kulczyck-Wojdala D, Blonski JZ, Robak T (2002). "Molecular diversity of gammadelta T cells in peripheral blood from patients with B-cell chronic lymphocytic leukaemia". Neoplasma. 49 (2): 86–90. PMID 12088111.
  • Strausberg RL, Feingold EA, Grouse LH; et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMID 12477932.
  • Oyoshi MK, Nagata H, Kimura N; et al. (2003). "Preferential expansion of Vgamma9-JgammaP/Vdelta2-Jdelta3 gammadelta T cells in nasal T-cell lymphoma and chronic active Epstein-Barr virus infection". Am. J. Pathol. 162 (5): 1629–38. PMID 12707047.
  • Cheng WS, Giandomenico V, Pastan I, Essand M (2003). "Characterization of the androgen-regulated prostate-specific T cell receptor gamma-chain alternate reading frame protein (TARP) promoter". Endocrinology. 144 (8): 3433–40. PMID 12865322.
  • van Hagen PM, Hooijkaas H, Vd Beemd MW; et al. (2003). "T-gammadelta receptor restriction in peripheral lymphocytes of patients with Behçet's disease". Adv. Exp. Med. Biol. 528: 267–8. PMID 12918704.

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