GEOapplication/xmlftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE312nnn/GSE312015/primaryOK200OtherMus musculusOtherhttps://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE312015GEOGSEfalseSingle-cell spatial transcriptomics reveals sex-dependent gene expression and intercellular signaling in the mouse adrenal cortexSexual dimorphism profoundly influences adrenal physiology and disease susceptibility, yet its molecular and spatial basis remains poorly understood. The female-predominant X-zone, a transient cortical structure recognized for nearly a century, has lacked comprehensive molecular characterization. Here we use high-resolution Visium HD spatial transcriptomics with Cellpose-based cell segmentation to generate ~203,000 near-single-cell-resolution transcriptomic profiles from sexually mature mouse adrenal glands (four male, four female). We identify ten distinct cell populations with sex differences spatially restricted to inner cortical zones. The X-zone exhibits pronounced sexual dimorphism, with Akr1c18 (20α-hydroxysteroid dehydrogenase) as the definitive marker (log₂FC = −16.28, female-enriched), establishing the X-zone as a specialized progesterone-catabolizing endocrine compartment. Female adrenal glands exhibit greater intercellular communication complexity (435 vs 369 interactions) and higher aggregate signalling strength, with SPP1-integrin pathways enriched in the female X-zone microenvironment. Spatial trajectory inference reveals a dominant centripetal transcriptional gradient from the CT capsule toward the middle zona fasciculata conserved across both sexes, and a secondary centrifugal axis emanating from the JMZ/X region that is prominent in females and reflects the transcriptionally active X-zone. This spatial atlas establishes spatial restriction as a fundamental organizing principle of endocrine sexual dimorphism and provides a foundational resource for investigating sex-specific adrenal physiology, with implications for precision medicine approaches to adrenal disorders.2026/06/25GSE312015GSM9336190GSM933618934290312015Mus musculus