T cell receptor alpha variable 9-1 (TRAV9-1)

T cell receptor alpha variable 9-1 (TRAV9-1) is a protein-coding gene segment that encodes the variable region (V region) of the alpha chain of the **T cell receptor (TCR)** complex[1][2]. This segment participates in **antigen recognition** as part of the highly variable alpha chain expressed by T lymphocytes. The alpha-beta TCR is essential for adaptive immunity; it recognizes peptides presented by major histocompatibility complex (MHC) molecules on antigen presenting cells, triggering T cell activation and downstream signaling pathways involved in immune responses[1][3]. TRAV9-1 is one of many V segments that, through somatic recombination during T cell development, generate the diversity of antigen recognition seen in T cell repertoires[1][3]. Variability at this segment contributes to the specificity of individual T cells, but by itself does not define a therapeutic target, as it is *one of many possible variable region gene segments*; typically, therapeutic targeting involves entire TCRs (such as TCR-engineered T cell therapies) or the complex as a whole, rather than any specific V gene segment[1][3].

Other names

T cell receptor alpha variable 9-1TRAV9-1TCRAV9S1TRAV91