title: [Mutation analysis of phenylalanine hydroxylase gene in 55 patients with phenylketonuria from Hebei province].
abstract: OBJECTIVE
  To identify the pathogenic mutations of phenylalanine hydroxylase gene (PAH) in patients with phenylketonuria (PKU) from Hebei Province.
  
  
  METHODS
  Genomic DNA was extracted from 55 unrelated PKU patients from September 2007 to July 2009. All PAH exons and exon-intron junctions were amplified by polymerase chain reaction (PCR) and sequenced. Multiplex ligation-dependent probe amplifications (MLPA) was performed to detect the deletions or duplications of PAH. Gap-PCR was used to determine the breakpoints of large deletions.
  
  
  RESULTS
  Among them, 108 mutant alleles (98.2%) were found. All PAH exons with the exceptions of exons 9 and 13 were affected. A total of 41 different mutations were detected, including missense (n = 24), nonsense (n = 7), splicing (n = 7), small deletion (n = 1) and large deletion (n = 2). Among them, 4 missense mutations (p.Pro147Leu, p.Gly289Arg, p.Phe392Ser, p.Ile421Thr) and 2 large deletions (-4163_-406del and -1932_+3402del) were novel. The most common mutations were p.Arg243Gln (12.7%), c.611A > G (11.8%) and c.1197A > T (9.1%).
  
  
  CONCLUSIONS
  The mutations of PKU patients with from Hebei Province are scattered throughout the PAH gene. Most of them are of single nucleotide substitutions, but large deletions are not rare.
authors.affiliation: McKusick-Zhang Center for Genetic Medicine, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100005, China.
authors.forename: Chao-xia
authors.initials: CX
authors.lastname: Lu
authors.forename: Xia
authors.initials: X
authors.lastname: Gao
authors.forename: Jin-wei
authors.initials: JW
authors.lastname: Wang
authors.forename: Mei
authors.initials: M
authors.lastname: Zhang
authors.forename: Hong-wen
authors.initials: HW
authors.lastname: Zhu
authors.forename: Jing
authors.initials: J
authors.lastname: Sun
authors.forename: Ji-fang
authors.initials: JF
authors.lastname: Xiao
authors.forename: Wei
authors.initials: W
authors.lastname: Yang
authors.forename: Xiu-li
authors.initials: XL
authors.lastname: Zhao
authors.forename: Zhan
authors.initials: Z
authors.lastname: Qi
authors.forename: Xue
authors.initials: X
authors.lastname: Zhang
mesh_terms: D044466:Asian People / Q000235:genetics; D001483:Base Sequence; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D004252:DNA Mutational Analysis; D005091:Exons; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009154:Mutation; D010651:Phenylalanine Hydroxylase / Q000235:genetics*; D010661:Phenylketonurias / Q000453:epidemiology / Q000235:genetics*
chemical_list: D010651:Phenylalanine Hydroxylase