T cell receptor alpha joining 21 (TRAJ21)

T cell receptor alpha joining 21 (TRAJ21) is a gene segment located within the TCR alpha locus in humans and mice. It encodes a joining (J) region element used during the somatic VJ (variable-joining) recombination process in developing T cells, which permits immense diversity within the antigen-recognition sites of T cell receptors (TCRs). The TRAJ21 segment does not encode a functional protein on its own but is incorporated into the mature TCR alpha chain when recombined with a variable (Vα) gene segment and the constant (Cα) region in developing T cells. Its role is conserved across species and is essential for generation of TCR diversity, but it is not a direct therapeutic, drug, or diagnostic target[1][4][6]. In summary: TRAJ21 is a J-gene segment of the TCR alpha locus, essential for adaptive immunity, but is not a distinct receptor, nor a direct therapeutic target or biomarker. Any reference to it as a druggable target or receptor is incorrect, though it is functionally indispensable for T cell antigen recognition[1][4][6].

Other names

TRAJ21Traj21 (in mouse)T cell receptor alpha joining 21

Null. Not applicable, as there are no drugs that interact directly with this gene segment.