Alkaptonuria, also known as ochronosis, is a rare inherited disorder that affects the body's ability to process certain substances called amino acids. It is caused by a defect in an enzyme called homogentisic acid oxidase that is needed to break down and eliminate the protein homogentisic acid from the body. People with alkaptonuria are unable to properly metabolize proteins, leading to the accumulation of homogentisic acid in their bodies and causing dark-coloured urine and other symptoms.
Who is Most Affected by Alkaptonuria?
Alkaptonuria affects about one in every 250,000 to one million people worldwide. It is most common among those of African, Mediterranean, and Middle Eastern descent. However, it can affect anyone regardless of race or ethnic background.
Symptoms of Alkaptonuria
The most common symptom of alkaptonuria is dark-coloured urine. This occurs because homogentisic acid builds up in the body and is excreted in the urine. Other symptoms may include joint pain, arthritis, and dark patches of skin, such as on the ears, nose, and around the eyes.
Diagnosis of Alkaptonuria
Alkaptonuria is usually diagnosed through a combination of a physical exam, family history, and genetic testing. A doctor may also order a urine test to look for high levels of homogentisic acid.
Treatment of Alkaptonuria
There is no cure for alkaptonuria, but there are treatments available to help manage the symptoms. These include pain relievers, anti-inflammatory medications, and supplements to help reduce the amount of homogentisic acid in the body. Additionally, lifestyle changes such as eating a healthy diet, exercising, and avoiding alcohol can help manage the symptoms.