Phenotypic and molecular characterization of a Colombian family with phenylketonuria

• Published in: Biomédica Vol. 36; no. 3; pp. 390 - 396
• Main Authors: Gélvez, Nancy, Acosta, Johana, López, Greizy, Castro, Derly, Prieto, Juan Carlos, Bermúdez, Martha, Tamayo, Marta L
• Format: Journal Article
• Language: Spanish
• Published: Colombia 01.09.2016
• Subjects: Colombia; Genotype; Humans; Mutation; Phenotype; Phenylalanine Hydroxylase; Phenylketonurias - genetics; Phenylketonurias - pathology; early diagnosis; mutation; genetics; phenylalanine hydroxylase; Phenylketonurias; diet; intellectual disability
• ISSN: 0120-4157
• DOI: 10.7705/biomedica.v36i3.2639

Phenylketonuria is a metabolic disorder characterized by severe neurological involvement and behavioral disorder, whose early diagnosis enables an effective treatment to avoid disease sequelae, thus changing the prognosis. Objective: To characterize a family with phenylketonuria in Colombia at clinical, biochemical and molecular levels. Materials and methods: The population consisted of seven individuals of a consanguineous family with four children with suggestive symptoms of phenylketonuria. After signing an informed consent, blood and urine samples were taken for colorimetric tests and high performance liquid and thin layer chromatographies. DNA extraction and sequencing of the 13 exons of the PAH gene were performed in all subjects. We designed primers for each exon with the Primer 3 software using automatic sequencing equipment Abiprism 3100 Avant. Sequences were analyzed using the SeqScape, v2.0, software. Results: We described the clinical and molecular characteristics of a Colombian family with phenylketonuria and confirmed the presence of the mutation c.398_401delATCA. We established a genotype-phenotype correlation, highlighting the interesting clinical variability found among the affected patients despite having the same mutation in all of them. Conclusions: Early recognition of this disease is very important to prevent its neurological and psychological sequelae, given that patients reach old age without diagnosis or proper management.