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J Med Genet. Aug 1989; 26(8): 499–503.
PMCID: PMC1015671
Identification of the haplotype pattern associated with the mutant PKU allele in the Gypsy population of Wales.
L A Tyfield, A L Meredith, M J Osborn, and P S Harper
Institute of Medical Genetics, University of Wales College of Medicine, Heath Park, Cardiff.
Abstract
Using the full length cDNA probe, the RFLP haplotype patterns at the phenylalanine hydroxylase locus have been studied in the extensive and highly consanguineous Welsh Gypsy population. The pattern associated with the mutant PKU allele is identical to haplotype 4 in the northern European population. Two children with classical PKU are homozygous for this haplotype. We have tracked the mutant allele through four generations to a great grandfather who died 22 years ago. Both affected children almost certainly have inherited a double dose of the same mutant PKU allele from one common ancestor. It should be possible to identify the specific mutation that is associated with haplotype 4 which results in the more serious form of PKU.
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