ACTR1A (actin related protein 1A) is a structural component of the dynactin complex that plays a crucial role in cytoskeletal organization and intracellular transport. As part of the ACTR1A/ACTB filament, it serves as the backbone around which the dynactin multiprotein complex assembles, activating the molecular motor dynein for processive transport along microtubules 1. Recent research has identified ACTR1A as a novel substrate of the SETD3 methyltransferase, which catalyzes its methylation and potentially regulates dynein-mediated intracellular transport beyond actin cytoskeleton dynamics 1. The protein functions as a key regulator of immune signaling, specifically interacting with Toll-like receptor 2 (TLR2) and modulating pro-inflammatory cytokine induction 2. ACTR1A demonstrates significant disease relevance across multiple conditions. It has been identified as a susceptibility locus for leprosy in African populations, with regulatory variants potentially mediating disease risk 3. The gene shows associations with blood pressure regulation and cognitive performance, suggesting roles in hypertension and Alzheimer's disease mechanisms 45. Additionally, ACTR1A expression correlates with insulin resistance in polycystic ovary syndrome and shows oncogenic properties in pancreatic cancer, highlighting its broad clinical significance 67.