OMIM numbers Each OMIM entry is given a unique six-digit identifier as summarized below: • 100000–299999: Autosomal
loci or phenotypes (entries created before May 15, 1994) • 300000–399999:
X-linked loci or phenotypes • 400000–499999:
Y-linked loci or phenotypes • 500000–599999:
Mitochondrial loci or phenotypes • 600000 and above:
Autosomal loci or phenotypes (entries created after May 15, 1994) In cases of
allelic heterogeneity, the MIM number of the entry is followed by a decimal point and a unique 4-digit number specifying the variant. Because OMIM has responsibility for the classification and naming of genetic disorders, these numbers are stable identifiers of the disorders. indicate the entry category: • An asterisk (*) before an entry number indicates a gene. • A number symbol (#) before an entry number indicates that it is a descriptive entry, usually of a phenotype, and does not represent a unique locus. The reason for the use of the number symbol is given in the first paragraph of the entry. Discussion of any gene(s) related to the phenotype resides in another entry (or entries) as described in the first paragraph. • A plus sign (+) before an entry number indicates that the entry contains the description of a gene of known sequence and a phenotype. • A percent sign (%) before an entry number indicates that the entry describes a confirmed Mendelian phenotype or phenotypic locus for which the underlying molecular basis is not known. • No symbol before an entry number generally indicates a description of a phenotype for which the Mendelian basis, although suspected, has not been clearly established or that the separateness of this phenotype from that in another entry is unclear. • A
caret (^) before an entry number means the entry no longer exists because it was removed from the database or moved to another entry as indicated. == See also ==