ACOT13 (acyl-CoA thioesterase 13) is a mitochondrial enzyme that catalyzes the hydrolysis of acyl-CoAs into free fatty acids and coenzyme A, thereby regulating intracellular levels of these metabolites 12. The protein exhibits thioesterase activity toward medium-chain (C12) and long-chain (C18) fatty acyl-CoA substrates and can also hydrolyze aromatic substrates like 3-hydroxyphenylacetyl-CoA and 3,4-dihydroxyphenylacetyl-CoA 12. ACOT13 appears to play a regulatory role in lipid metabolism and may contribute to controlling adaptive thermogenesis. Disease relevance includes associations with multiple conditions: genetic variants in ACOT13 have been linked to ankylosing spondylitis through Mendelian randomization studies 3, resistance to retained placenta in Holstein cattle 4, and autosomal dominant polycystic kidney disease through whole exome sequencing analysis 5. The gene has also been incorporated into prognostic models for ovarian cancer, suggesting broader clinical significance 67. Additionally, ACOT13 variants show association with language skills in children with autism spectrum disorders, indicating potential roles in neurodevelopmental processes 8. These findings suggest ACOT13 functions extend beyond basic metabolism to influence diverse physiological and pathological processes.