Type of disease: Rare conditions
Galactokinase deficiency, or galactosemia type 2, is a type of galactosemia that affects how the body processes a simple sugar called galactose. A small amount of galactose is present in many foods. It is primarily part of a larger sugar called lactose, which is found in all dairy products and many baby formulas. The signs and symptoms of galactosemia result from an inability to use galactose to produce energy. Galactokinase deficiency causes fewer medical problems than the classic type. Affected infants usually develop cataracts, but otherwise experience few long-term complications. This condition is caused by mutations in the GALK1 gene and is inherited in an autosomal recessive fashion. Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.