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Related Concept Videos

Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
Overview of Protein Metabolism01:21

Overview of Protein Metabolism

Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
Pathophysiology of Diabetes01:20

Pathophysiology of Diabetes

Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...
Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

Pharmacokinetics in Pediatric Patients: Drug Metabolism

In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses a challenge in...
Teratogenicity01:07

Teratogenicity

The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...

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Concurrent Collection of Fetal Murine Brain and Serum to Assess Effects of Maternal Diet on Nutrition and Neurodevelopment in Neurofibromatosis Type 1
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[The maternal phenylketonuria syndrom--still current problem].

Bozena Didycz1, Lucyna Domagała, Jacek J Pietrzyk

  • 1Klinika Chorób Dzieci Katedry Pediatrii, Uniwersytet Jagielloński Collegium Medium w Krakowie. bozenadidycz@wp.pl

Przeglad Lekarski
|June 3, 2009
PubMed
Summary

Planning pregnancies is crucial for women with phenylketonuria (PKU) to prevent maternal PKU syndrome. Unplanned pregnancies with high phenylalanine levels significantly increase risks for fetal development and health outcomes.

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Area of Science:

  • Metabolic disorders
  • Genetics
  • Maternal-fetal medicine

Background:

  • Phenylketonuria (PKU) is a genetic metabolic disorder characterized by the inability to properly metabolize phenylalanine.
  • Elevated phenylalanine levels during pregnancy can lead to teratogenic effects, causing maternal PKU syndrome (MPKU) in the fetus.
  • MPKU syndrome features include low birth weight, congenital defects, microcephaly, and intellectual disabilities.

Observation:

  • This study evaluated the impact of maternal hyperphenylalaninemia on fetal outcomes based on metabolic control.
  • Data from 50 pregnancies in 21 women with hyperphenylalaninemia were analyzed.
  • Planned pregnancies with pre-conception dietary management (phenylalanine levels 2-6 mg/dl) resulted in healthy offspring in 9 out of 10 cases.

Findings:

  • Unplanned pregnancies showed significantly higher rates of miscarriage (8/40) and fetal complications.
  • Of 33 children born from unplanned pregnancies, 75% exhibited MPKU features, including microcephaly and congenital heart defects.
  • Early dietary intervention in unplanned pregnancies showed varied outcomes, with some infants developing ADHD.

Implications:

  • All pregnancies in women with hyperphenylalaninemia must be planned and meticulously managed.
  • Comprehensive patient and family education regarding PKU and pregnancy is essential.
  • Healthcare providers (pediatricians, family physicians, obstetricians) require updated knowledge on MPKU syndrome features and management.