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The most common form of glycine encephalopathy, called the classical type, appears shortly after birth. Affected infants experience a progressive lack of energy (lethargy), feeding difficulties, weak muscle tone (hypotonia), abnormal jerking movements, and life-threatening problems with breathing.
After phenylketonuria, glycine encephalopathy is the second most common disorder of amino acid metabolism. The disease is caused by defects in the glycine cleavage system, an enzyme responsible for glycine catabolism.lycine 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.