A point mutation, C to T, in exon 8 of the porphobilinogen deaminase gene in a Japanese family with acute intermittent porphyria.
Acute intermittent porphyria (AIP) is an autosomal dominant disease characterized by a deficiency of porphobilinogen deaminase (PBGD). To date, only two mutations have been reported in Japanese patients. We report here another mutation of the gene in a Japanese patient. Analysis of the PCR amplified DNA fragments of the gene by direct-sequencing method revealed the gene abnormality responsible for the disease. The mutation found was a point mutation, C to T, in exon 8 of the gene at position 346 of the housekeeping cDNA from the translation codon ATG. This mutation resulted in an Arg116 to Trp substitution. Four carriers in the family were successfully diagnosed by detecting the mutation using restriction analysis of PCR products.
Morita
Y
Y
Third Department of Internal Medicine, Yamagata University School of Medicine, Japan.
Daimon
M
M
Kashiwaba
M
M
Yamatani
K
K
Igarashi
M
M
Fukase
N
N
Ohnuma
H
H
Ikezawa
Y
Y
Sugiyama
K
K
Manaka
H
H
D000328:Adult; D001483:Base Sequence; D003597:Cytosine Nucleotides; D005091:Exons; D005192:Family Health; D005260:Female; D006801:Humans; D011163:Hydroxymethylbilane Synthase / Q000235:genetics*; D007564:Japan; D008297:Male; D008969:Molecular Sequence Data; D010375:Pedigree; D017354:Point Mutation; D017118:Porphyria, Acute Intermittent / Q000201:enzymology* / Q000235:genetics; D013942:Thymine Nucleotides
D003597:Cytosine Nucleotides; D013942:Thymine Nucleotides; D011163:Hydroxymethylbilane Synthase