Identification of three novel PKU mutations among Chinese: evidence for recombination or recurrent mutation at the PAH locus.
Three novel mutations have been identified in the phenylalanine hydroxylase (PAH) genes of Chinese classical phenylketonuria (PKU) patients. Two of these substitutions (W326X and Y356X) result in the generation of a premature stop codon, while the third (IVS-7nt2) alters an invariant dinucleotide splicing signal. These mutations together account for about 10% of all PKU alleles in the Chinese population. The W326X mutation is associated with PAH RFLP haplotype 4, the most common haplotype in Orientals, while the IVS-7nt2 mutation occurs once on a haplotype 7 chromosome. The Y356X mutation is associated with multiple haplotypes, possibly due to crossover, gene conversion, or recurrent mutation.
Department of Cell Biology, Howard Hughes Medical Institute, Baylor College of Medicine, Houston, Texas 77030.
T
T
Wang
Y
Y
Okano
R C
RC
Eisensmith
W H
WH
Lo
S Z
SZ
Huang
Y T
YT
Zeng
L F
LF
Yuan
S R
SR
Liu
S L
SL
Woo
D044466:Asian People / Q000235:genetics; D001483:Base Sequence; D003062:Codon / Q000235:genetics; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D010651:Phenylalanine Hydroxylase / Q000235:genetics*; D010661:Phenylketonurias / Q000201:enzymology* / Q000235:genetics; D012150:Polymorphism, Restriction Fragment Length; D011995:Recombination, Genetic / Q000235:genetics; D044465:White People / Q000235:genetics
D003062:Codon; D010651:Phenylalanine Hydroxylase