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  2. Phenylketonuria - Wikipedia

    en.wikipedia.org/wiki/Phenylketonuria

    Phenylketonuria is inherited in an autosomal recessive fashion. PKU is an autosomal recessive metabolic genetic disorder. As an autosomal recessive disorder, two PKU alleles are required for an individual to experience symptoms of the disease. For a child to inherit PKU, both parents must have and pass on the defective gene. [17]

  3. Hyperphenylalaninemia - Wikipedia

    en.wikipedia.org/wiki/Hyperphenylalaninemia

    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 ...

  4. Phenylpyruvic acid - Wikipedia

    en.wikipedia.org/wiki/Phenylpyruvic_acid

    The compound exists in equilibrium with its (E)- and (Z)-enol tautomers.[citation needed] It is a product from the oxidative deamination of phenylalanine.When the activity of the enzyme phenylalanine hydroxylase is reduced, the amino acid phenylalanine accumulates and gets converted into phenylpyruvic acid (phenylpyruvate), which leads to 'Phenylketonuria (PKU)' instead of 'tyrosine' which is ...

  5. Pleiotropy - Wikipedia

    en.wikipedia.org/wiki/Pleiotropy

    A common example of pleiotropy is the human disease phenylketonuria (PKU). This disease causes mental retardation and reduced hair and skin pigmentation , and can be caused by any of a large number of mutations in the single gene on chromosome 12 that codes for the enzyme phenylalanine hydroxylase , which converts the amino acid phenylalanine ...

  6. Phenylalanine ammonia-lyase - Wikipedia

    en.wikipedia.org/wiki/Phenylalanine_ammonia-lyase

    [1] [5] PAL has recently been studied for possible therapeutic benefits in humans afflicted with phenylketonuria. [6] It has also been used in the generation of L-phenylalanine as precursor of the sweetener aspartame. [7] The enzyme is a member of the ammonia lyase family, which cleaves carbon–nitrogen bonds.

  7. Neonatal heel prick - Wikipedia

    en.wikipedia.org/wiki/Neonatal_heel_prick

    The blood of a two-week-old infant is collected for a Phenylketonuria, or PKU, screening. The neonatal heel prick is a blood collection procedure done on newborns. It consists of making a pinprick puncture in one heel of the newborn to collect their blood. This technique is used frequently as the main way to collect blood from neonates.

  8. Ivar Asbjørn Følling - Wikipedia

    en.wikipedia.org/wiki/Ivar_Asbjørn_Følling

    The children, he concluded, had excess phenylpyruvic acid in the urine, the condition which came to be called phenylketonuria (PKU). This abnormal condition reflects an inability to break down the amino acid phenylalanine due to a hereditary deficiency of the necessary enzyme which is called phenylalanine hydroxylase .

  9. Newborn screening - Wikipedia

    en.wikipedia.org/wiki/Newborn_screening

    Newborn screening originated with an amino acid disorder, phenylketonuria (PKU), which can be easily treated by dietary modifications, but causes severe Intellectual disability if not identified and treated early. Robert Guthrie introduced the newborn screening test for PKU in the early 1960s. [12]