• Internal medicine · Apr 2001

    Case Reports

    Compound heterozygosity for alpha-1-antitrypsin (S(iiyama) and QO(clayton)) in an Oriental patient.

    • N Miyahara, K Seyama, T Sato, Y Fukuchi, R Eda, H Takeyama, and M Harada.
    • Department of Internal Medicine, Respiratory Disease Center, National Sanyo Hospital, Ube, Yamaguchi.
    • Intern. Med. 2001 Apr 1; 40 (4): 336340336-40.

    AbstractAlpha-1-antitrypsin (alpha1AT) deficiency is extremely rare among Orientals. We treated a 37-year-old man with severe pulmonary emphysema associated with a low serum concentration of alpha1AT. Mutation analysis of the alpha1AT gene was performed using a reverse transcription-polymerase chain reaction followed by sequencing. The patient proved to be a compound heterozygote carrying a S(iiyama) deficient allele and a QO(clayton) null allele. This is the first Japanese case of alpha1AT deficiency to arise from such compound heterozygosity in a family with no apparent consanguineous marriage, suggesting that the gene frequency for deficient alleles might be somewhat higher than previously estimated.

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