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Treatment is with a diet that (1) is low in foods that contain phenylalanine, and which (2) includes special supplements. Babies should use a special formula with a small amount of breast milk. The diet should begin as soon as possible after birth and be continued for life. [2]
Propionic acidemia, also known as propionic aciduria or propionyl-CoA carboxylase deficiency (PCC deficiency), [1] is a rare autosomal recessive metabolic disorder, classified as a branched-chain organic acidemia. [2] [3] The disorder presents in the early neonatal period with poor feeding, vomiting, lethargy, and lack of muscle tone. [4]
Due to the rarity of the disease, it is hard to estimate mortality rates or life expectancy. One 2003 study which followed 88 cases receiving two different kinds of treatment found that very few persons lived beyond age 20 and none beyond age 30. [1]
Phenylketonuria (PKU)-like symptoms, including more pronounced developmental defects, skin irritation, and vomiting, may appear when phenylalanine levels are near 20 mg/dL (1200 mol/L). [1] Hyperphenylalaninemia is a recessive hereditary metabolic disorder that is caused by the body's failure to convert phenylalanine to tyrosine as a result of ...
A low-protein diet is used as a therapy for inherited metabolic disorders, such as phenylketonuria and homocystinuria, and can also be used to treat kidney or liver disease. Low protein consumption appears to reduce the risk of bone breakage, presumably through changes in calcium homeostasis. [1]
Untreated PKU results in irreversible neurological damage. [1] After the discovery of PKU as a cause of mental retardation, Horst Bickel and colleagues discovered that it could be treated successfully with a diet low in phenylalanine. [7] The main drawback in successful treatment of PKU was the delay in identifying affected individuals.
Glycine encephalopathy has an estimated incidence of 1 in 60,000, making it the second most common disorder of amino acid metabolism, after phenylketonuria. It is caused by a defect in the glycine cleavage system (GCS), which is made up of four protein subunits. Each of these four subunits is encoded by a separate gene. Defects in three of ...
Isovaleric acidemia has an autosomal recessive pattern of inheritance.. The disorder has an autosomal recessive inheritance pattern, which means the defective gene is located on an autosome, and two copies of the gene – one from each parent – must be inherited to be affected by the disorder.