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After the ingestion of lactose, most commonly from breast milk for an infant or cow milk and any milk from an animal, the enzyme lactase hydrolyzes the sugar into its monosaccharide constituents, glucose and galactose. In the first step of galactose metabolism, galactose is converted to galactose-1-phosphate (Gal-1-P) by the enzyme galactokinase.
Galactosemia follows an autosomal recessive mode of inheritance that confers a deficiency in an enzyme responsible for adequate galactose degradation. Friedrich Goppert (1870–1927), a German physician, first described the disease in 1917, [1] with its cause as a defect in galactose metabolism being identified by a group led by Herman Kalckar ...
Regardless, median galactose-1-phosphate levels act as the most accurate predictors of the severity of symptoms associated with Type III galactosemia. [10] Blockage of the Leloir pathway by GALE deficiency or dysfunction activates alternate pathways of glucose metabolism and leads to galactitol and galactonate formation.
Unlike galactose-1-phosphate uridyltransferase deficiency, the symptoms of galactokinase deficiency are relatively mild. The only known symptom in affected children is the formation of cataracts, due to the production of galactitol in the lens of the eye. [ 6 ]
Leloir metabolic pathway: Galactose-1Puridylyltransferase (GALT, red font) is the middle enzyme in the Leloir pathway of galactose metabolism. Duarte galactosemia is an inherited condition associated with diminished ability to metabolize galactose due to a partial deficiency of the enzyme galactose-1-phosphate uridylyltransferase . [ 1 ]
Danon disease (GSD 2b, Danon disease, lysosomal glycogen storage disease without acid maltase deficiency) Symptoms of both GSD types IIa and IIb are very similar due to a defect in lysosomes. However, in type IIb, some show abnormal glycogen accumulation, but not all. Classic infantile form (Pompe disease): Cardiomyopathy and muscular hypotonia.
Is the most problematic, as galactose-free diets are not effective in treating neurocognitive deficiencies (in particular language disorders such as verbal dyspraxia) and ovarian failure. If a galactose-free diet is administered, cataracts and acute symptoms such as kidney and liver failure respond immediately.
Fatty-acid metabolism disorders result when both parents of the diagnosed subject are carriers of a defective gene. This is known as an autosomal recessive disorder. Two parts of a recessive gene are required to activate the disease. If only one part of the gene is present then the individual is only a carrier and shows no symptoms of the disease.