AASDHPPT (aminoadipate-semialdehyde dehydrogenase-phosphopantetheinyl transferase) is a phosphopantetheinyl transferase that catalyzes post-translational modification of target proteins by transferring the 4'-phosphopantetheine moiety from coenzyme A to serine residues 1. While traditionally characterized as a cytoplasmic enzyme, AASDHPPT contains an N-terminal mitochondrial targeting sequence within its first 20 amino acids that enables dual localization to the mitochondrial matrix 2. This mitochondrial localization is functionally significant: AASDHPPT is required for phosphopantetheinylation of mitochondrial acyl carrier protein, which is essential for mitochondrial fatty acid synthesis (mtFAS) activity and oxidative metabolism 1. Loss of AASDHPPT results in impaired mtFAS pathway function and compromised mitochondrial respiration. Clinically, five AASDHPPT variants of uncertain significance have been identified as likely pathogenic due to mtFAS dysfunction 2. Beyond its metabolic role, AASDHPPT shows dysregulation in disease contexts: expression is upregulated in glioma tissues 3 and identified as a hub gene in colorectal cancer pathogenesis through gene co-expression analysis 4. Additionally, AASDHPPT serves as a tumor-associated antigen, eliciting autoantibody responses in ovarian cancer 5.