title: Inter-individual variation in brain phenylalanine concentration in patients with PKU is not caused by genetic variation in the 4F2hc/LAT1 complex.
abstract: It remains a question why some patients with phenylketonuria (PKU) have high IQ and low brain phenylalanine (Phe) concentrations in spite of high blood Phe levels. One possible explanation for the low brain Phe concentrations in these patients would be a reduced transport of Phe across the blood-brain barrier. The 4F2hc/LAT1 complex has been suggested to be the most important molecular component responsible for this transport. To test the hypothesis that structural variant(s) in the genes encoding 4F2hc and LAT1 might result in a complex with reduced affinity for Phe, we have screened the two genes for sequence variants in a group of 13 PKU patients with a low ratio of brain to blood Phe concentrations. Several common sequence variants were identified, but none of these is predicted to affect the resulting protein product. Our data suggest that individual vulnerability to Phe in patients with PKU is not due to structural variants in the 4F2hc/LAT1 complex.
authors.affiliation: Kennedy Institute, Glostrup, Denmark. LBM@kennedy.dk
authors.forename: Lisbeth Birk
authors.initials: LB
authors.lastname: Møller
authors.forename: Marianne
authors.initials: M
authors.lastname: Paulsen
authors.forename: Richard
authors.initials: R
authors.lastname: Koch
authors.forename: Rex
authors.initials: R
authors.lastname: Moats
authors.forename: Per
authors.initials: P
authors.lastname: Guldberg
authors.forename: Flemming
authors.initials: F
authors.lastname: Güttler
mesh_terms: D000328:Adult; D001483:Base Sequence; D001693:Biological Transport, Active; D001812:Blood-Brain Barrier; D001921:Brain / Q000378:metabolism; D001923:Brain Chemistry; D005091:Exons; D027282:Fusion Regulatory Protein 1, Heavy Chain / Q000235:genetics*; D005838:Genotype; D006801:Humans; D007360:Intelligence; D027283:Large Neutral Amino Acid-Transporter 1 / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D010649:Phenylalanine / Q000032:analysis* / Q000097:blood / Q000378:metabolism; D010661:Phenylketonurias / Q000097:blood / Q000235:genetics* / Q000473:pathology
chemical_list: D027282:Fusion Regulatory Protein 1, Heavy Chain; D027283:Large Neutral Amino Acid-Transporter 1; D010649:Phenylalanine