What happens when phenylalanine accumulates in the body?
What happens when phenylalanine accumulates in the body?
Phenylalanine is an essential nutrient, but some individuals are born with a genetic disorder, phenylketonuria (PKU), that prevents them from metabolizing phenylalanine, and, if untreated, phenylalanine accumulates in the body, becomes converted into phenylpyruvate, and the individual usually develops seizures, brain …
What are the causes of phenylketonuria?
Causes of phenylketonuria PKU is an inherited condition caused by a defect in the PAH gene. The PAH gene helps create phenylalanine hydroxylase, the enzyme responsible for breaking down phenylalanine. A dangerous buildup of phenylalanine can occur when someone eats high-protein foods, such as eggs and meat.
Why is phenylalanine toxic to the brain?
The high plasma phenylalanine concentrations increase phenylalanine entry into brain and restrict the entry of other large neutral amino acids. In the literature, emphasis has been on high brain phenylalanine as the pathological substrate that causes mental retardation.
What does PKU smell like?
If PKU is untreated, or if foods containing phenylalanine are eaten, the breath, skin, ear wax, and urine may have a “mousy” or “musty” odor. This odor is due to a buildup of phenylalanine substances in the body.
What is phenylalanine side effects?
Side effects may include:
- Heartburn.
- Fatigue.
- Nausea.
- Constipation.
- Dizziness.
- Headache.
- Anxiety and hypomania (a milder form of mania)
- Sedation.
What are the dangers of phenylalanine?
Phenylalanine can cause intellectual disabilities, brain damage, seizures and other problems in people with PKU . Phenylalanine occurs naturally in many protein-rich foods, such as milk, eggs and meat. Phenylalanine is also sold as a dietary supplement.
Why does PKU cause neurological symptoms?
PKU affects the brain. When neurotransmitters are not made in the right amounts, the brain cannot function properly. High blood Phe levels can cause disruptions in neurotransmitters like serotonin and dopamine, which are important for mood, learning, memory, and motivation.
Can phenylalanine cause insomnia?
Aspartame (α-aspartyl-l-phenylalanine-o-methyl ester), an artificial sweetener, has been linked to behavioral and cognitive problems. Possible neurophysiological symptoms include learning problems, headache, seizure, migraines, irritable moods, anxiety, depression, and insomnia.
What are the side effects of phenylalanine?
What organs does phenylketonuria affect?
A. In a child with PKU, phenylalanine cannot be converted to tyrosine because the phenylalanine hydroxylase enzyme does not work properly. This results in dangerously high levels of phenylalanine that build up in the blood and become toxic to the brain and nervous system.
How do you know if you are allergic to phenylalanine?
Phenylalanine can trigger allergic reactions, with symptoms such as: Itching. Swelling of the face or hands. Trouble breathing.
What are the symptoms of phenylketonuria ( PKU )?
PKU signs and symptoms can be mild or severe and may include: A musty odor in the breath, skin or urine, caused by too much phenylalanine in the body Fair skin and blue eyes, because phenylalanine can’t transform into melanin — the pigment responsible for hair and skin tone
What should you know about phenylalanine in food?
Federal regulations require that any beverage or food that contains aspartame bear this warning: “Phenylketonurics: Contains phenylalanine.” This warning helps people with PKU avoid products that are a source of phenylalanine.
How is phenylalanine harmful to people with PKU?
Phenylalanine can cause intellectual disabilities, brain damage, seizures and other problems in people with PKU. Phenylalanine occurs naturally in many protein-rich foods, such as milk, eggs and meat. Phenylalanine is also sold as a dietary supplement.
Who is at risk for phenylketonuria blood disorder?
While anyone can develop PKU, certain ethnic groups are more at risk, especially people of Native American or European descent. What causes phenylketonuria? PKU is caused by the buildup of phenylalanine in the body. Your body uses this amino acid to make other proteins. If you have PKU, your body can’t break down phenylalanine.
