Phenylalanine hydroxylase gene: novel missense mutation in exon 7 causing severe phenylketonuria.

Abstract:

:By direct sequence analysis of 94 mutant phenylalanine hydroxylase alleles using polymerase chain reaction-based techniques, we identified a C to T transition in exon 7 of the human phenylalanine hydroxylase gene that is associated with RFLP haplotypes 1 and 4. A leucine for proline substitution at position 281 can be predicted from the nucleotide sequence of the mutant codon. Expression analysis in cultured mammalian cells after site-directed mutagenesis proved that the base substitution is a disease causing gene lesion. Dot-blot hybridization analysis using allele-specific oligonucleotides revealed that 25% of all mutant haplotype 1 alleles in the German population bear this mutation. In addition, this mutation could be detected on one mutant haplotype 4 allele. The fact that this mutation is associated with only 25% of all mutant haplotype 1 alleles suggests that multiple mutations may be associated with this haplotype. The occurrence of several different mutations would be in agreement with the clinical heterogeneity observed in the group of patients whose PKU alleles belong to haplotype 1.

journal_name

Genomics

journal_title

Genomics

authors

Dworniczak B,Grudda K,Stümper J,Bartholomé K,Aulehla-Scholz C,Horst J

doi

10.1016/0888-7543(91)90238-a

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

193-9

issue

1

eissn

0888-7543

issn

1089-8646

pii

0888-7543(91)90238-A

journal_volume

9

pub_type

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