To date, the efficacy of the phenylalanine hydroxylase (PAH) cofactor is proved for the treatment of both BH4-dependent hyperphenylalaninemia and phenylketonuria patients with mutations in the PAH gene. Since the patient’s response depends on the presence of residual PAH enzyme activity, it is advisable to search for mutations in the PAH gene to identify the potential responders and nonresponders to therapy. Four hundred thirty-five phenylketonuria patients from 13 regions of the Russian Federation were genotyped in order to identify responders and nonresponders to tetrahydrobiopterin (BH4) therapy. According to the results of this study, the number of probable nonresponders to the BH4 treatment exceeds 50% owing to a higher overall allelic frequency of “severe” PAH gene mutations. Responder patients with two “mild” mutations in the PAH gene were identified (1.6%).
Russian Journal of Genetics – Springer Journals
Published: Jul 12, 2017
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