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Alpha 1-antitrypsin phenotypes in a Nigerian population.

S O Olusi, G O Ladipo, O O Ojutiku

    African Journal of Medicine and Medical Sciences
    |September 1, 1982
    PubMed
    Summary

    Nigerian blood donors exhibit unique Alpha 1-antitrypsin (AAT) phenotypes, differing from Caucasian populations. This study identified common and rare AAT alleles, highlighting the S gene

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    Area of Science:

    • Genetics
    • Population Genetics
    • Biochemistry

    Background:

    • Alpha 1-antitrypsin (AAT) is a crucial proteinase inhibitor.
    • AAT phenotypes vary significantly across different ethnic groups.
    • Understanding AAT allele frequencies is important for population health.

    Purpose of the Study:

    • To determine the distribution of Alpha 1-antitrypsin (AAT) phenotypes in a Nigerian population.
    • To identify common and potentially rare AAT alleles in Nigeria.
    • To investigate the implications of observed AAT allele frequencies.

    Main Methods:

    • Isoelectric focusing in polyacrylamide gel electrophoresis was used.
    • Phenotyping was performed on 350 normal Nigerian blood donors.
    • Statistical analysis of phenotype distributions was conducted.

    Main Results:

    • The study determined AAT phenotypes including MM, MS, MZ, SS, and SZ.
    • Observed phenotype frequencies (MM: 66.86%, MS: 16.29%, MZ: 0.57%, SS: 2.0%, SZ: 0.28%) differed from Caucasian populations.
    • A significant number of donors (49) could not be classified, suggesting rare alleles in Nigeria.

    Conclusions:

    • Nigerian AAT phenotype distribution is distinct from Caucasian populations.
    • The presence of unclassified phenotypes indicates the occurrence of rare AAT alleles in Nigeria.
    • The high frequency of the S gene in Nigerians warrants further investigation into its causes and health implications.

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