T cell receptor alpha variable 4 (TRAV4)

T cell receptor alpha variable 4 (TRAV4) is a **variable region gene segment** of the alpha chain of the T cell receptor (TCR) complex, predominantly expressed on the surface of T lymphocytes as part of the alpha-beta TCR heterodimer[1][2][3]. The TCR enables T cells to recognize and bind to specific antigen fragments presented by major histocompatibility complex (MHC) molecules on antigen-presenting cells, initiating essential signaling cascades for immune activation[1][2]. TRAV4, like other TCR variable segments, contributes to the diversity of antigen recognition via V(D)J recombination, allowing the immune system to respond to a vast array of pathogens[2][3]. Members of the TCR family are central to **adaptive immunity**, are classified as **immunoglobulin superfamily receptors**, and play direct roles in anti-infective and antitumor immune function. Dysfunction or dysregulation of TCRs, including those with TRAV4, can result in immune deficiencies, autoimmune diseases, or aberrant immune activation[1][3].

Other names

TCRAV20S1TCRAV4S1TRAV4T-cell receptor alpha variable 4