Atlas One · Host Biology · Scale 07 — System

Paroxysmal Nocturnal Hemoglobinuria

PNH is a clonal PIGA disorder of GPI-anchor synthesis; GPI-deficient RBCs lack CD55/CD59 → complement MAC lysis + C5a-driven thrombosis; eculizumab and ravulizumab (anti-C5 mAbs) normalize hemolysis and reduce thrombosis 90%; iptacopan (oral factor B inhibitor) also approved.

Also known as: PNH, paroxysmal nocturnal hemoglobinuria, PIGA mutation, GPI-anchor deficiency, CD55/CD59 deficiency, Marchiafava-Micheli disease

Scale 07 — SystemScale
draftStatus
2026-06-07Last Reviewed
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pnh

Paroxysmal Nocturnal Hemoglobinuria

PNH is a clonal PIGA disorder of GPI-anchor synthesis; GPI-deficient RBCs lack CD55/CD59 → complement MAC lysis + C5a-driven thrombosis; eculizumab and ravulizumab (anti-C5 mAbs) normalize hemolysis and reduce thrombosis 90%; iptacopan (oral factor B inhibitor) also approved.