C3G Natural History Study: Assisting with the C3G Natural History study in development of a robust database of patients with C3 Glomerulopathy, with the goal of developing and validating useful predictive models of disease progression in a longitudinal data-driven analysis of clinical data, pathology and complement factors in C3G.  Our end goal is to establish a more complete understanding of disease progression to define treatable targets for this ultra-rare disease.