PNH is a clonal hematopoietic stem cell disease associated with a complementdependent hemolytic anemia. The disease manifests after the expansion of a multipotent hematopoietic stem cell that acquires a mutation of the PIGA gene. The PIGA gene product is required for the biosynthesis of glycophosphatidylinositol anchors, a glycolipid moiety that attaches dozens of proteins to the plasma membran...