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Other Names for this Disease
- Alkaptonuric ochronosis
- Homogentisic acid oxidase deficiency
- Homogentisic acidura
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Alkaptonuria is an inherited condition that causes urine to turn black when exposed to air. Ochronosis, a buildup of dark pigment in connective tissues such as cartilage and skin, is also characteristic of the disorder. This blue-black pigmentation usually appears after age 30. People with alkaptonuria typically develop arthritis, particularly in the spine and large joints, beginning in early adulthood. Other features of this condition can include heart problems, kidney stones, and prostate stones. Alkaptonuria is caused by mutations in the HGD gene. It is inherited in an autosomal recessive fashion.
- Alkaptonuria. Genetics Home Reference (GHR). http://ghr.nlm.nih.gov/condition=alkaptonuria. Accessed August 1, 2011.
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- The National Organization for Rare Disorders (NORD) is a federation of more than 130 nonprofit voluntary health organizations serving people with rare disorders. Click on the link to view information on this topic.
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- PubMed is a searchable database of medical literature and lists journal articles that discuss Alkaptonuria. Click on the link to view a sample search on this topic.
- The The Online Mendelian Inheritance in Man (OMIM) database contains genetics resources that discuss Alkaptonuria. Click on the link to go to OMIM and review these resources.