OBJECTIVES/GOALS: Maternal health and exposures during pregnancy play a major role in shaping the neurodevelopment of our offspring—one influence is maternal immune activation (MIA). Here we explore the association of MIA during pregnancy and the developing human connectome through analysis of 46 markers of activation. METHODS/STUDY POPULATION: 74 healthy women with singleton pregnancies underwent blood draws between 34-37 weeks gestation. 46 markers of maternal immune activation, both adaptive (e.g., IgG) and innate (e.g., cytokines and acute phase reactants), were collected. In addition, for preliminary analyses of MIA in relation to the newborn brain, we utilized 30 participants with MRIs between the ages of 0-6 months. RESULTS/ANTICIPATED RESULTS: Principal component analysis (PCA) identified the first 5 PCs explains ~68% of the variance and the first 10 explains ~83% (top PC is 42.1%). Using the top PC each edge in the connectome was correlated with the immune profiles. Several regions trended towards significance–one survived correction and included 359 edges, showing. The highest number of edges was observed in the inferior parietal lobe of the left hemisphere–a region associated with functions from basic attention toa social cognition, suggesting that deviations in fetal exposure to MIA can longitudinally impact offspring behavior in areas essential for human interaction. DISCUSSION/SIGNIFICANCE: This is the first study in understanding how interruptions (i.e., MIA) influence later development. Identification of alterations, and long-term outcomes could lead to the development of mechanism-based healthcare, facilitate timely referral for appropriate interventions and provide family support.