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. 1995 Aug;57(2):337–342.

Evidence in Latin America of recurrence of V388M, a phenylketonuria mutation with high in vitro residual activity.

L R Desviat 1, B Pérez 1, M De Lucca 1, V Cornejo 1, B Schmidt 1, M Ugarte 1
PMCID: PMC1801570  PMID: 7668259

Abstract

Phenylketonuria mutation V388M is frequent in the Iberian Peninsula. In vitro, the V388M mutant enzyme has similar immunoreactive protein and phenylalanine hydroxylase mRNA and has 43% residual activity, which correlates well with the mild phenotype exhibited by the homozygous patients. In Spain it has been detected in 5.7% of the mutant alleles and is always associated with haplotype 1.7. This mutation is also present in high frequency in some Latin American countries (Brazil, 9%; Chile, 13%). It is interesting that in Chile most of the alleles bearing this mutation carry haplotype 4.3, although in Brazil it is found only on the background of haplotype 1.7. The origin of V388M in Spain on haplotype 1.7 and in Chile on haplotype 4.3 is clearly different. Recurrence is the most plausible explanation, because the mutation involves a CpG dinucleotide, and a recombination event transferring the mutation from haplotype 1 to 4 is unlikely.

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Selected References

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