Online Mendelian Inheritance in Man

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Online Mendelian Inheritance in Man (OMIM) is an online database at the United States of America National Library of Medicine about diseases that have genetic components. According to the OMIM website, OMIM is a "catalog of human genes and genetic disorders authored and edited by Dr. Victor A. McKusick and his colleagues at Johns Hopkins and elsewhere, and developed for the World Wide Web by NCBI, the National Center for Biotechnology Information. The database contains textual information and references. It also contains copious links to MEDLINE and sequence records in the Entrez system, and links to additional related resources at NCBI and elsewhere."[1]

OMIM Numbering

OMIM Number Prefixes[2]
Prefix Meaning
* gene with known sequence
+ gene with known sequence and phenotype
# phenotype description, molecular basis known
% Mendelian phenotype or locus, molecular basis unknown
no prefix other, mainly phenotypes with suspected Mendelian basis


  1. Anonymous. OMIM Home. National Library of Medicine. Retrieved on 2008-03-04.
  2. Anomymous (February 27, 2007). OMIM Frequently Asked Questions (FAQs) (English). National Center for Biotechnology Information. Retrieved on 2009-08-29.

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