T-cell receptor beta locus (TRB) (TRB)

The T-cell receptor beta locus (TRB) is a complex genomic region located on chromosome 7 (7q34) that encodes the beta chain of the T-cell receptor (TCR) [1, 2]. This locus undergoes somatic V(D)J recombination during T-cell development, a process that generates a diverse repertoire of TCRs capable of recognizing a wide array of peptide antigens presented by Major Histocompatibility Complex (MHC) molecules [2, 12]. The resulting TCR beta chain pairs with an alpha chain to form the alpha-beta TCR heterodimer, which is essential for T-cell activation and the adaptive immune response [12]. In clinical oncology, the TRB locus is a primary target for TCR-engineered T-cell (TCR-T) therapies, such as afamitresgene autoleucel, which utilize specific TCR sequences to redirect T-cells against tumor antigens [3, 13]. Furthermore, high-throughput sequencing of the TRB locus serves as a critical biomarker for assessing T-cell clonality and monitoring minimal residual disease in lymphoid malignancies [7, 8]. Therapeutic manipulation of this target carries risks such as cytokine release syndrome and potential off-target toxicity if the engineered TCR recognizes similar peptides in healthy tissues [10, 11]. The locus is also involved in the pathogenesis of various T-cell lymphomas and autoimmune disorders, where restricted TCR usage or chromosomal translocations may occur [1, 13]. Overall, the TRB locus is a cornerstone of adaptive immunity and a versatile tool in precision medicine and immunotherapy.

Other names

TCRBTRB@T-cell receptor beta clusterT-cell receptor beta chainT-cell receptor beta-chain locus

TCR-mediated antigen recognition and T-cell activation; redirection of T-cell specificity via engineered TCR expression; modulation of the TCR-CD3 complex signaling.