Pre-T-cell receptor alpha (PTCRA)

Pre-T-cell receptor alpha (PTCRA) is a monomorphic type I transmembrane glycoprotein that serves as a critical component of the pre-T-cell receptor (pre-TCR) complex [1][2]. During early T-cell development in the thymus, PTCRA pairs with a successfully rearranged T-cell receptor beta (TCRB) chain and the CD3 signaling complex to form the pre-TCR [3]. This assembly is essential for beta-selection, a checkpoint that signals the cell to stop further TCRB rearrangement, initiate rapid proliferation, and proceed with differentiation from the double-negative to the double-positive stage [1][3]. Because PTCRA expression is strictly limited to this early developmental window and is absent on mature T-cells, it represents a highly specific marker for certain malignancies [4]. In T-cell acute lymphoblastic leukemia (T-ALL), PTCRA is frequently overexpressed and plays a role in driving leukemogenesis through constitutive signaling [4]. Consequently, PTCRA is being actively explored as a therapeutic target for chimeric antigen receptor (CAR) T-cell therapies and monoclonal antibodies, offering a strategy to eliminate leukemic blasts while sparing the mature peripheral T-cell repertoire [4]. Sources: [1] UniProt Consortium. PTCRA - Pre T-cell antigen receptor alpha - Homo sapiens (Human). UniProtKB, Q6ISU1. [2] National Center for Biotechnology Information (NCBI). PTCRA pre T cell antigen receptor alpha [Homo sapiens (human)]. Gene ID: 171558. [3] von Boehmer, H. The lineage commitment of stem cells, to T and B cells. Nature Immunology, 2004. [4] Macintyre, E., et al. The pre-T cell receptor in T-cell acute lymphoblastic leukemia. Current Opinion in Hematology, 2014.

Other names

pT-alphaPre-TCR-alphaPre-T-cell antigen receptor alphaPTCRA

Targeted cell lysis via CAR-T cell engagement or antibody-dependent cellular cytotoxicity (ADCC) to deplete PTCRA-expressing leukemic cells.