AGTR2 (angiotensin II receptor type 2) is a G-protein-coupled receptor located on the X chromosome X functions as a receptor for angiotensin II 1. Unlike typical G-protein-coupled receptor signaling, AGTR2 signals primarily through non-canonical pathways independent of G-proteins and beta-arrestin 1. The receptor cooperates with MTUS1 to inhibit ERK2 activation and cell proliferation 2, and participates in multiple physiological processes including vasodilation, blood pressure regulation, nitric oxide-cGMP-mediated signaling, and inflammatory responses [GO annotations cited in source material]. Genetically, AGTR2 polymorphisms influence skeletal muscle fiber composition and athletic performance 3. The C allele of rs11091046 is associated with increased slow-twitch muscle fibers and endurance athlete status, while the A allele associates with fast-twitch fibers and power-oriented athletic performance 3. AGTR2 polymorphisms also interact with dietary patterns to modulate cardiovascular disease risk factors including blood pressure and lipid profiles 4. Clinically, AGTR2 has emerged as relevant to multiple disease contexts. The rs1403543-AA genotype associates with increased risk of COVID-19 retinopathy 5, and AGTR2 targeting may benefit idiopathic pulmonary fibrosis patients with specific molecular subtypes 6. Additionally, AGTR2 polymorphisms associate with metabolic syndrome susceptibility 7, and AGTR2 is identified as a hub target in diabetic kidney disease pathogenesis 8. In brain development, AGTR2 influences genes regulating dendritic spine morphology and learning/memory functions 9.