PIGN (Phosphatidylinositol Glycan Anchor Biosynthesis Class N): PIGN is involved in the biosynthesis of glycosylphosphatidylinositol (GPI) anchors, which are used to attach certain proteins to the cell membrane. GPI-anchored proteins play critical roles in cell adhesion, signal transduction, and immune response. Mutations in PIGN can lead to GPI anchor biosynthesis disorders, characterized by a wide range of symptoms including developmental delays, neurological issues, and congenital anomalies, reflecting the importance of GPI-anchored proteins in human physiology....