Homogentisic acid, also known as melanic acid, is an intermediate in the breakdown or catabolism of tyrosine and phenylalanine.
References:
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Possible causes:
- Impaired metabolism due to cofactor insufficiency (iron, vitamin C, 02)
- Chronically high levels of homogentisic acid are associated with alkaptonuria, an inborn error of metabolism. Alkaptonuria is a rare inherited genetic disorder in which the body cannot process the amino acids phenylalanine and tyrosine.
Additional investigations:
- Iron studies
Treatment considerations:
- Supplement iron if low
- Vitamin C
- Improve oxygenation
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2-Hydroxyphenylacetic Acid, 3-Hydroxyisovaleric Acid, 3-Hydroxyphenylacetic Acid, 3-Hydroxypropionic Acid, 3-Methyl-4-OH-phenylglycol, 4-Hydroxyphenylacetic Acid, 5-OH-indoleacetic Acid, a-Hydroxyisobutyric Acid (from MTBE), a-Keto-b-Methylvaleric Acid, a-Ketoadipic Acid, a-Ketoglutaric Acid (AKG), a-Ketoisocaproic Acid, a-Ketoisovaleric Acid, a-Ketophenylacetic Acid (from Styrene), Adipic Acid, Arabinose, B-OH-B-Methylglutaric Acid (HMG), Benzoic Acid, Beta-OH-Butyric Acid (BHBA), Cis-Aconitic Acid, Citramalic Acid, Citric Acid, Dihydroxyphenylpropionic Acid (DHPPA), Formiminoglutamic Acid (FIGlu), Glutaric Acid, Hippuric Acid, Homogentisic Acid, Homovanillic Acid, Indoleacetic Acid (IAA), Isocitric Acid, Isovalerylglycine, Kynurenic / Quinolinic Ratio, Kynurenic Acid, Lactic Acid, Malic Acid, Methylmalonic Acid, Orotic Acid, Phenylacetic Acid (PAA), Pyroglutamic Acid, Pyruvic Acid, Quinolinic Acid, Suberic Acid, Succinic Acid, Tartaric Acid, Vanilmandelic Acid, Xanthurenic Acid
