Activating PRKG1 Variant Enhances Smooth Muscle Cell Deformability to Cause Aortopathy.

Aortic dissection can strike without warning. Whereas the condition is typically linked to aging and chronic hypertension, rare genetic variants emerge as silent culprits. One variant, V219I in PRKG1, has been found in patients with aortic aneurysms despite near-normal aortic diameters. Vascular smooth muscle cells expressing the V219I variant were larger, more deformable, and showed aberrant actin cytoskeleton dynamics. They exhibited altered extracellular matrix signaling and weakened structural integrity, highlighting a shift toward increased tissue elasticity as the causal molecular pathomechanism. These findings offer a mechanistic model for how PRKG1 variants predispose to aortic dissection.