Abstract:
:Phenylketonuria (PKU) is an autosomal recessive human genetic disorder caused by a deficiency of hepatic phenylalanine hydroxylase (PAH, phenylalanine 4-monooxygenase, EC 1.14.16.1). PKU is a common inborn error of amino-acid metabolism in caucasian populations and approximately 1 in 50 individuals are carriers of a PKU allele. To define the molecular basis of PKU, we characterized twelve restriction fragment-length polymorphism (RFLP) haplotypes of the PAH locus in the northern European population and observed that 90% of the PKU alleles in this population are confined to four common RFLP haplotypes. We have recently reported a splicing mutation in the PAH gene that is associated with RFLP haplotype 3 which is present at about 40% of mutant alleles. We now report the molecular lesion associated with the RFLP haplotype 2 mutant allele. This defect is caused by a C-to-T transition in exon 12 resulting in an amino-acid substitution (Arg to Trp) at residue 408 of PAH. Direct hybridization analysis of the point mutation using a specific oligonucleotide probe demonstrated that this mutation is also in linkage disequilibrium with RFLP haplotype 2 alleles that make up about 20% of mutant PAH genes.
journal_name
Naturejournal_title
Natureauthors
DiLella AG,Marvit J,Brayton K,Woo SLdoi
10.1038/327333a0subject
Has Abstractpub_date
1987-05-28 00:00:00pages
333-6issue
6120eissn
0028-0836issn
1476-4687journal_volume
327pub_type
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