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Interferon-alpha 2 variants in the human genome

N Lee1, D Ni, R Brissette

  • 1Interferon Sciences, Inc., New Brunswick, New Jersey 08901, USA.

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|April 1, 1995
PubMed
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This study investigated human interferon alpha 2 (IFN-alpha 2) gene variants in over 28,000 individuals. The interferon alpha 2b variant was predominant, while interferon alpha 2a was undetected in the population.

Area of Science:

  • Genetics
  • Immunology
  • Molecular Biology

Background:

  • Human leukocyte interferon alpha 2 (IFN-alpha 2) exists in several variants (alpha 2a, alpha 2b, alpha 2c).
  • These variants are distinguished by specific nucleotide variations at positions 137 and 170 in their coding regions.
  • These sequence differences allow for differentiation using restriction enzyme analysis.

Purpose of the Study:

  • To determine the prevalence of different human IFN-alpha 2 gene variants within a large healthy population.
  • To analyze the distribution of IFN-alpha 2a, IFN-alpha 2b, and IFN-alpha 2c gene variants.

Main Methods:

  • Genomic DNA was extracted from over 28,000 healthy individuals.
  • The human IFN-alpha 2 gene was amplified using polymerase chain reaction (PCR).

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  • Restriction enzyme analysis was performed on PCR products to identify specific IFN-alpha 2 variants.

    • Main Results:

    • Interferon alpha 2b was identified as the predominant variant in the studied population.
    • Interferon alpha 2c was found to be a very minor species, representing less than 0.1%.
    • The interferon alpha 2a gene variant was not detected in any of the analyzed samples.

    Conclusions:

    • The genetic landscape of human IFN-alpha 2 variants in this population is dominated by the IFN-alpha 2b type.
    • The low or absent prevalence of IFN-alpha 2a and IFN-alpha 2c suggests potential evolutionary or functional selection pressures.
    • Further research is warranted to understand the implications of this variant distribution.