SMOC1 (SPARC related modular calcium binding 1) is an extracellular matrix protein that plays critical roles in development and disease pathogenesis. The protein functions as a calcium-binding modulator involved in eye and limb development, as well as regulation of osteoblast differentiation [UniProt]. SMOC1 has emerged as a significant biomarker in Alzheimer's disease (AD), where it strongly colocalizes with amyloid plaques (43.8% in AD cases) and correlates with plaque load across disease stages 1. The protein interacts directly with amyloid beta (Aβ) and delays its aggregation in a dose-dependent manner, suggesting a protective role in AD pathogenesis 1. SMOC1 levels are consistently elevated in cerebrospinal fluid of AD patients and represent one of the earliest changing proteins in disease progression 234. Beyond neurodegeneration, SMOC1 functions in pancreatic cell biology, where it acts as a β-cell dedifferentiation marker in type 2 diabetes 5. The protein also regulates keratinocyte differentiation through calcium signaling, with IL-4 and IL-13 cytokines inhibiting SMOC1 expression and disrupting calcium-induced differentiation signals 6. These diverse functions highlight SMOC1's importance in cellular differentiation, extracellular matrix organization, and disease progression across multiple organ systems.