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Galactose-1-phosphate uridylyltransferase deficiency
Galactose-1-phosphate uridylyltransferase deficiency, also called galactosemia type 1, classic galactosemia or GALT deficiency, is the most common type of galactosemia, an inborn error of galactose metabolism, caused by a deficiency of the enzyme galactose-1-phosphate uridylyltransferase. It is an autosomal recessive metabolic disorder that can cause liver disease and death if untreated. Treatment of galactosemia is most successful if initiated early, and includes dietary restriction of lactose intake. Because early intervention is key, galactosemia is included in newborn screening programs in many areas. On initial screening, which often involves measuring the concentration of galactose in blood, classic galactosemia may be indistinguishable from other inborn errors of galactose metabolism, including galactokinase deficiency and galactose epimerase deficiency. Further analysis of metabolites and enzyme activities are needed to identify the specific metabolic error.
==Symptoms and diagnosis==
In undiagnosed and untreated children, the accumulation of precursor metabolites due to the deficient activity of galactose 1-phosphate uridylyltransferase (GALT) can lead to feeding problems, failure to thrive, liver damage, bleeding and infections. The first presenting symptom in an infant is often prolonged jaundice. Without intervention in the form of galactose restriction, infants can develop hyperammonemia and sepsis, possibly leading to shock. The accumulation of galactilol and subsequent osmotic swelling can lead to cataracts which are similar to those seen in galactokinase deficiency.〔 In 〕 Long-term consequences of continued galactose intake can include developmental delay, developmental verbal dyspraxia and motor abnormalities. Galactosemic females frequently suffer from ovarian failure, regardless of treatment in the form of galactose restriction.〔
In most regions, galactosemia is diagnosed as a result of newborn screening, most commonly by determining the concentration of galactose in a dried blood spot. Some regions will perform a second-tier test of GALT enzyme activity on samples with elevated galactose, while others will immediately initiate confirmatory testing. While awaiting confirmatory testing for classic galactosemia, the infant is typically fed a soy-based formula, as human and cow milk contains galactose.〔(【引用サイトリンク】Galactose-1-Phosphate Uridyltransferase (GALT) ) Classical Galactosemia">url=http://www.acmg.net/StaticContent/ACT/Galactose+GALT.pdf )〕 Confirmatory testing would include measurement of enzyme activity in red blood cells, determination of Gal-1-P levels in the blood, and genetic testing. The differential diagnosis for elevated galactose concentrations in blood on a newborn screening result can include other disorders of galactose metabolism, including galactokinase deficiency and galactose epimerase deficiency. Enzyme assays are commonly done using fluorometric detection or radioactively labeled substrates.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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