ATP13A5 is a P5-type ATPase localized to the endosomal system with tissue-restricted expression in brain and epithelial glandular cells 1. It belongs to the P5B clade of ATPases that diversified in mammals and likely contains 10 transmembrane helices 1. While the precise substrate specificity remains incompletely characterized, ATP13A5 is implicated in polyamine transmembrane transport based on comparative studies of P5B-ATPases 1, and a genome-wide association study identified ATP13A5 as a novel locus regulating salivary creatinine levels 2. Clinically, ATP13A5 has been identified as a candidate diagnostic gene for allergic dermatitis, emerging from differential expression analysis and immune response profiling in AD patients 3. Additionally, ATP13A5 variants were detected in a family with atypical Hailey-Hailey disease alongside the primary ATP2C1 mutation, suggesting potential modifying effects on disease expressivity through altered ATPase protein levels 4. Recent evidence indicates ATP13A5 expression correlates with hydrogen sulfide-related pathways in breast cancer subtypes, where it contributes to molecular classification and prognostic stratification 5. The specialized tissue distribution and emerging disease associations suggest ATP13A5 may exert compartment-specific functions in cellular ion homeostasis and metabolite regulation, though functional mechanisms require further investigation.