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KMID : 0918520160160010001
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Journal of the Korean Society of Inherited Metabolic Disease
2016 Volume.16 No. 1 p.1 ~ p.9
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A Diagnostic Algorithm after Newborn Screening for Hypermethioninemia
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Kim Yoo-Mi
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Abstract
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Newborn screening (NBS) is important if early intervention is effective in a disorder and if there are sensitive and specific biochemical markers to detect disorder. Methionine is a useful marker to detect abnormal methionine-homocysteine metabolism, especially homocystinuria which needs urgent medical intervention. However, hypermethioninemia could occur in other metabolic disorder including liver disease, tyrosinemia type I, methionine adenosyltransferase (MAT) I/III deficiency, glycine N-methyltransferase (GNMT) deficiency, or adenosylhomocysteine hydrolase deficiency. However, experience with NBS for homocystinurias and methylation disorders is limited. Especially, MAT I/III deficiency which is the most common cause of persistent hypermethioninemia have two inheritance, autosomal recessive (AR) and
autosomal dominant (AD), and their clinical manifestation is different between AR and AD. Here, author reviewed recent articles of guideline and proposed guideline for homocystinuria and methylation disorder.
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KEYWORD
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Homocysteine, Hypermethioninemia, Newborn screening
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