Description Aromatase excess syndrome is a condition characterized by elevated levels of the female sex hormone estrogen in both males and females. Males with aromatase excess syndrome experience breast enlargement (gynecomastia) in late childhood or adolescence. The bones of affected males grow and develop more quickly and stop growing sooner than usual (advanced bone age). As a result males have an early growth spurt, typically during late childhood, with short stature as an adult. Affected females rarely show signs and symptoms of the condition, but they may have increased breast growth (macromastia), irregular menstrual periods, and short stature. The ability to have children (fertility) is usually normal in both males and females with aromatase excess syndrome. Causes Rearrangements of genetic material involving the CYP19A1 gene cause aromatase excess syndrome. The CYP19A1 gene provides instructions for making an enzyme called aromatase. This enzyme converts a class of hormones ca...
Disease Overview Summary African iron overload is a rare disorder characterized abnormally elevated levels of iron in the body. The name originates from the initial description of this entity in sub-Saharan Africa, in communities where affected individuals drink a traditional, homemade beer that contains a high amount of iron. Symptoms may vary from case to case but can include the accumulation of fibrous tissue (fibrosis) in the liver and, eventually, scarring of the liver (cirrhosis). The exact cause of African iron overload is unknown, but researchers believe that a combination of dietary and genetic factors result in the development of the disorder. Introduction Researches originally believed that the popular, iron-rich beer caused cases of African iron overload. However, many individuals that drank the beer did not develop the disorder and some individuals that did not drink the beer did develop it. This led researchers to speculate that a mutation of a gene or genes involved in t...