Research studies suggests that these PKU patients may not be able to process tyrosine normally. The American Academy of Pediatrics recommends that this test should be performed on infants between 24 hours and seven days after birth. More From encyclopedia. Phenylalanine is normally metabolized to tyrosinecatalysed by phenylalanine hydroxylase.
Stimulating a nerve cell triggers nerve impulses, or signals, that speed down the axon. Kalverboer, J. The majority of these children do not have PKU.
Gray, and Lisa Lehn O'Brien. Weiner, William J. More From encyclopedia. Also, it must be remembered that human cells contain two copies of each type of gene. Phenylketonuria PKU is an inherited disorder in which an enzyme usually phenylalanine hydroxylase crucial to the appropriate processing of the amino acidphenylalanine is totally absent or drastically deficient.
About twenty amino acids exist in nature. Phenotype and Phenotypic Variation. Normally, the first step in phenylala-nine metabolism is conversion to tyrosine, another amino acid. Their sweat and urine may have a mousy smell that is caused by phenylacetic acid, a byproduct of phenylalanine metabolism.
Teratogens are any substance or organism that can cause birth disorders in a developing fetus.
The liver is the body's chief protein-processing center. Axon — Skinny, wire-like extension of nerve cells. They should ensure that phenylalanine blood levels are under control before conception and throughout her pregnancy.