# OMIM — Online Mendelian Inheritance in Man ## Overview Online Mendelian Inheritance in Man (OMIM) is a curated compendium of human genes and genetic phenotypes, maintained by Johns Hopkins University since 1966 (originally as a print catalogue by Victor McKusick). Each entry has a unique MIM number identifying either a gene or a phenotype, and describes the molecular basis, inheritance pattern, clinical features, and genotype-phenotype relationships. ## MIM Number System OMIM assigns unique 6-digit identifiers with prefix symbols indicating the entry type. A hash (#) prefix indicates a phenotype with known molecular basis. A percent (%) prefix indicates a phenotype with unknown or suspected genetic basis. A plus (+) prefix indicates a gene of known sequence and phenotype. ## Connections - implements: [[HPO]] (phenotype annotation of disease entries) - relatedTo: [[ClinVar]] (variant records linked from gene entries) ## Resources - https://omim.org - https://omim.org/downloads (bulk data downloads, CC BY-NC-ND licence)