A previously unknown sequence of the human phelylalanine hydroxylase (PAH) gene intron 7 (GeneBank AN AF204239) has been reported. Screening of the group of phenylketonuria patients from Nobosibirsk region for polymorphic sites within intron 7 revealed single nucleotide substitutions at intron positions 332, 451, 574 and 791. Polymorphic site at intron position 791 corresponds to one of the eight restriction sites (MspI) utilized for haplotype construction. Analysis of the MspI allele frequencies in 29 phenylketonuria patients showed that the frequency of the MspI+ allele in this group was 79.4%. Polymorphic sites at nucleotide position +97 from the beginning of intron 10, and at nucleotide position –54 from the end of intron 5, were also described. The polymorphic sites revealed can be used as markers for identification of the PAH alleles in population genetic studies, and also serve for diagnostics of phenylketonuria (PKU). The presence of numerous nucleotide substitutions within the intronic sequences confirms highly polymorphic structure of the PAH gene.
Russian Journal of Genetics – Springer Journals
Published: Oct 8, 2004
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