Send to

Choose Destination
Clin Biochem. 2012 May;45(7-8):588-92. doi: 10.1016/j.clinbiochem.2012.01.026. Epub 2012 Feb 4.

The spectrum of mutations identified in Cypriot patients with phenylalanine hydroxylase deficiency detected through neonatal screening.

Author information

Department of Biochemical Genetics, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus.



The purpose of this study was to identify the mutations responsible for phenylalanine hydroxylase deficiency in Cypriot patients detected through neonatal screening.


Analysis of the PAH gene was performed by direct sequencing of the patients' genomic DNA, MLPA analysis and real-time PCR.


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.


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.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center