Georgiou T, Ho G, Vogazianos M, Dionysiou M, Nicolaou A, Chappa G, Nicolaides P, Stylianidou G, Christodoulou J, Drousiotou A. The spectrum of mutations identified in Cypriot patients with phenylalanine hydroxylase deficiency detected through neonatal screening.
Clin Biochem 2012;
45:588-92. [PMID:
22330942 DOI:
10.1016/j.clinbiochem.2012.01.026]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Revised: 01/17/2012] [Accepted: 01/27/2012] [Indexed: 11/26/2022]
Abstract
OBJECTIVES
The purpose of this study was to identify the mutations responsible for phenylalanine hydroxylase deficiency in Cypriot patients detected through neonatal screening.
DESIGN AND METHODS
Analysis of the PAH gene was performed by direct sequencing of the patients' genomic DNA, MLPA analysis and real-time PCR.
RESULTS
Among 22 independent alleles thirteen previously described mutations were detected (detection rate 100%), all in compound heterozygosity: p.Arg395Gly (18.2%), c.168+5G>C (13.6%), p.EX3del (9%), c.1066-11G>A (9%), p.Ala403Val (9%), p.Glu178Gly (9%), p.Ser70Pro (4.5%), p.Arg241His (4.5%), p.Phe55fs (4.5%), p.Arg158Gln (4.5%), p.Asp222Gly (4.5%), p.Ala300Ser (4.5%), p.Pro225Thr (4.5%). Of the ten different genotypes, three have been previously reported to be associated with a mild clinical phenotype and to respond to tetrahydrobiopterin (BH₄) administration.
CONCLUSIONS
Marked genetic heterogeneity was found in Cypriot patients with hyperphenylalaninemia with two mutations accounting for 32% of the alleles. Most of the mutations detected have been found in other European and Mediterranean populations.
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