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Recurrent mutation in the human phenylalanine hydroxylase gene
Y Okano1, T Wang, R C Eisensmith
1Howard Hughes Medical Institute, Department of Cell Biology, Baylor College of Medicine, Houston, TX 77030.
American Journal of Human Genetics
|May 1, 1990
Summary
A recurrent mutation in the phenylalanine hydroxylase (PAH) gene, causing phenylketonuria (PKU), was identified in Denmark. This finding suggests multiple independent origins for PKU alleles.
Area of Science:
- Genetics
- Molecular Biology
- Human Disease
Background:
- Phenylketonuria (PKU) is an autosomal recessive metabolic disorder caused by mutations in the phenylalanine hydroxylase (PAH) gene.
- Understanding the genetic basis and mutation patterns of PKU is crucial for diagnosis and potential therapeutic strategies.
Observation:
- A specific missense mutation (Glu280Lys) in the PAH gene was identified in a Danish PKU patient.
- This mutation was found to be associated with haplotype 1 of the PAH gene in the Danish population.
Findings:
- The same Glu280Lys mutation was previously observed in North Africa, associated with haplotype 38.
- The exclusive association of this mutation with two distinct haplotypes in different populations supports the hypothesis of recurrent mutations.
- The mutation occurs at a CpG dinucleotide, suggesting these sites are mutation hotspots in the PAH gene.
Implications:
- The findings indicate that PKU alleles may arise independently multiple times through recurrent mutation.
- CpG dinucleotides represent potential mutation hotspots within the human PAH gene.
- This recurrent mutation pattern has implications for population genetics studies of PKU and other genetic disorders.