Tetraspanin-12 (TSPAN12)

Tetraspanin-12 (TSPAN12) is a member of the tetraspanin family, which are membrane proteins characterized by four transmembrane domains. TSPAN12 is expressed widely across tissues and is notable for its unusually long cytoplasmic C-terminal tail. It forms part of tetraspanin-enriched microdomains (TEMs) on cell membranes, mediating the assembly and function of protein complexes involved in diverse cellular processes. Functionally, TSPAN12 is a crucial modulator of ADAM10, a membrane protease essential for the cleavage of amyloid precursor protein (APP)—a process implicated in Alzheimer’s disease. Additionally, TSPAN12 acts as a co-receptor in the Norrin–Frizzled-4/LRP5 pathway, playing an indispensable role in retinal vascular development and homeostasis. Pathogenic variants in TSPAN12 are strongly associated with familial exudative vitreoretinopathy. Overexpression or altered function of TSPAN12 has been implicated in cancer progression by protecting β-catenin from degradation and influencing cell adhesion molecules

Other names

Tetraspanin-12NET2TM4SF12Tspan-12NET-2Transmembrane 4 superfamily member 12EVR5UNQ774/PRO1568tetraspan NET-2

Enhancers or inhibitors of Tetraspanin-12–ADAM10 interaction may modulate APP cleavage (therapeutic relevance for Alzheimer’s disease). Disruption/modulation of TSPAN12–Norrin/Frizzled-4/LRP5 signaling may influence vascular or retinal pathophysiology.