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What numbering system is used in the OMIM database?

April 26, 2017database numbering OMIM system Used

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What numbering system is used in the OMIM database?

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Each OMIM entry is given a unique six-digit number as summarized in the table below: 1—– (100000- ) 2—– (200000- ) Autosomal loci or phenotypes (entries created before May 15, 1994) 3—– (300000- ) X-linked loci or phenotypes 4—– (400000- ) Y-linked loci or phenotypes 5—– (500000- ) Mitochondrial loci or phenotypes 6—– (600000- ) Autosomal loci or phenotypes (entries created after May 15, 1994) An allelic variant is designated by the MIM number of its parent entry, followed by a decimal point and a unique 4-digit variant number. For example, allelic variants (mutations) at the factor IX (hemophilia B) locus are numbered 306900.0001 to 306900.0101. The beta-globin locus (HBB) is numbered 141900; sickle hemoglobin is numbered 141900.0243.