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The Phosphatidylinositol Glycan Class A (PIGA) protein is essential for the first step of Glycosylphosphatidylinositol (GPI) anchor biosynthesis.GPl anchors are important for normal development,particularly of the CNS.Germline mutations in PIGA at Xp22.2 are now recognized to cause Multiple congenital anomalies-hypotonia-seizures syndrome-2 (MCAHS2).