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Background

Phenylketonuria (PKU) is the most common aminoacidopathy with an autosomal recessive inheritance pattern. A global PKU prevalence is estimated about 6.002 in 100,000 newborns. In Iran, the prevalence of PKU is estimated at about 1 in 4,698, and it shows an increasing trend from north (0.0015%) to south (0.02%) of the country. Untreated PKU causes mental retardation, microcephaly, and seizure. PAH gene mutations located at chromosome 12q23 are responsible for the classical type of this disease. The spectrum of PAH mutations is varied in different ethnicities and different parts of the world. The aim of this study was to investigate the frequency of PAH mutation in the Mazandaran province, which could be useful for genetic counseling and prenatal diagnosis.

Methods

A total of 66 individuals from 33 families from two provinces (9 families from Golestan and 24 families from Mazandaran) from north of Iran participated in this study. After genomic DNA extraction, PAH gene analysis was carried out using DNA sequencing of both coding and non-coding regions by ABI 3130XL genetic analyzer.

Results

Twenty-six different mutations were identified in the PAH gene in this study. Four mutations including IVS10-11 (c.1066-11G>A), c.727C>T (p.Arg243X), c.898G>T (p.Ala300Ser), and c.601C>T (p.His201Tyr) were the most common mutations with 37.48% frequency in Mazandaran province. Most frequent mutations in Golestan province were IVSI0-11 (c.1066-11G>A), c.722delG (p.Arg241fs), c.842C>T (p.Pro281Leu), and IVSII+5 (G>A) with frequency 58.57%.

Conclusions

The results from the present study verify heterogeneity of the PAH gene and may help to diagnose tests for carrier detection and prenatal diagnosis of the PKU disease in Iranian population."xsd:string
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http://purl.uniprot.org/citations/35023679http://purl.uniprot.org/core/title"Frequency of PAH Mutations Among Classic Phenylketon Urea Patients in Mazandaran and Golestan Provinces, North of Iran."xsd:string
http://purl.uniprot.org/citations/35023679http://purl.uniprot.org/core/volume"68"xsd:string
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