T cell receptor alpha joining 23 (TRAJ23)

TRAJ23 (T cell receptor alpha joining 23) is a *joining (J) gene segment* in the locus encoding the alpha chain of the T cell receptor (TCR). It serves as one possible gene segment joined during somatic recombination in T cell development, pairing with a variable (V) and constant (C) segment to generate part of the TCR alpha chain's antigen binding region. The T cell receptor, formed by unique combinations of these gene segments, is responsible for recognizing antigens presented by MHC molecules on antigen-presenting cells, playing an essential role in adaptive immunity[1][2][3]. TRAJ23 itself does not encode a functional protein but is a small interval in the genome used during the V(D)J recombination process. As such, it is not considered a therapeutic target nor does it interact directly with drugs, serve as a biomarker, or have associated safety concerns[1][2][4]. Key clarification: TRAJ23 is *not a distinct protein, enzyme, receptor, or druggable target*, but is a segment that recombines with others to produce the variable domain of the TCR alpha chain[1][2][3]. For functional and therapeutic targeting, the relevant entity is the T cell receptor (alpha/beta or gamma/delta complex), not its individual joining gene segments.

Other names

TRAJ23TCR alpha joining 23TRAV/DV