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The GPAA1 gene codes for a post-translational glycosylphosphatidylinositol (GPI) anchor attachment 1 protein at the GPI transfer step but is not essential for GPI synthesis. This protein functions as a general mechanism to link proteins to the cell surface membrane and is coded before/during the formation of the carbonyl intermediate. Isoform 1 is 621 amino acids in length at 67 kDA while isoform 2 exists at 561 amino acids long at 61 kDA. GPAA1 participates in various metabolic pathways as well as post-translational protein modification through interactions with genes PRR13, ALPP, PIN1, EIF3E, and GRIK5. GPAA1 has been investigated regarding various diseases such as ataxia, hepatocellular carcinoma, and breast cancer.
