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Related Experiment Videos

Chicken interferon gene: cloning, expression, and analysis

M J Sekellick1, A F Ferrandino, D A Hopkins

  • 1Department of Molecular and Cell Biology, University of Connecticut, Storrs 06269-3044.

Journal of Interferon Research
|April 1, 1994
PubMed
Summary
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Researchers cloned the chicken interferon (ChIFN) gene, revealing a protein structure similar to mammalian type I interferons. This biologically active ChIFN, confirmed through protein synthesis and antibody neutralization, offers insights into avian antiviral immunity.

Area of Science:

  • Molecular Biology
  • Immunology
  • Virology

Background:

  • Interferons (IFNs) are crucial antiviral proteins.
  • Understanding avian IFNs is vital for comparative immunology.
  • Chicken embryo cells can be induced to produce IFN.

Purpose of the Study:

  • To clone and characterize the chicken interferon (ChIFN) gene.
  • To analyze the predicted protein structure and conserved motifs.
  • To confirm the biological activity of the synthesized ChIFN.

Main Methods:

  • Cloning of the ChIFN gene from a cDNA library of aged chick embryo cells.
  • Bioinformatic analysis of the predicted amino acid sequence and protein structure.
  • Northern blotting to correlate mRNA accumulation with IFN induction.

Related Experiment Videos

  • In vitro synthesis of biologically active ChIFN protein in transfected mouse L cells.
  • Neutralization assay using a monoclonal antibody against ChIFN.

    • Main Results:

    • The cloned ChIFN gene encodes a protein with a signal peptide and mature protein of 162 amino acids.
    • Predicted ChIFN protein exhibits structural similarities to mammalian type I IFNs, including conserved cysteine residues and an alpha-helical topology.
    • A highly conserved amino acid motif shows significant homology with mammalian type I IFNs.
    • Biologically active ChIFN protein was synthesized and its activity confirmed via antibody neutralization.
    • Sequence analysis revealed varying degrees of homology with different mammalian IFN subtypes and fish IFN.

    Conclusions:

    • The cloned ChIFN gene represents a functional type I interferon.
    • The structural and sequence similarities suggest conserved functions between chicken and mammalian type I IFNs.
    • This study provides a molecular basis for understanding chicken interferon's role in antiviral defense.