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Related Experiment Videos

Internal duplication in human alpha 1 and beta 1 interferons.

B W Erickson, L T May, P B Sehgal

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1984
    PubMed
    Summary
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    Human interferon genes (IFN-alpha 1 and IFN-beta 1) show internal duplication and sequence similarity. This suggests a common evolutionary origin for these related immune signaling proteins.

    Area of Science:

    • Genetics
    • Molecular Biology
    • Bioinformatics

    Background:

    • Interferons (IFNs) are crucial for immune responses.
    • Human interferon alpha 1 (IFN-alpha 1) and interferon beta 1 (IFN-beta 1) genes are known to be related.
    • Understanding gene structure and evolutionary relationships is vital.

    Purpose of the Study:

    • To investigate the sequence structure of intron-free human IFN-alpha 1 and IFN-beta 1 genes.
    • To analyze the internal repeats and sequence similarities between these interferon genes.
    • To infer the evolutionary origins of IFN-alpha 1 and IFN-beta 1.

    Main Methods:

    • Metric analysis using the Sellers TT algorithm on nucleotide sequences.
    • Translation of DNA repeats into amino acid sequences for comparison.

    Related Experiment Videos

  • Manual alignment of metric alignments to derive consensus sequences.
  • Comparative analysis of nucleotide and amino acid sequence identities.

    • Main Results:

    • IFN-beta 1 gene exhibits two major repeated segments (approx. 300 nucleotides each) with 45% nucleotide identity and 19% amino acid identity.
    • IFN-alpha 1 gene also shows two repeats with 47% nucleotide and 19% amino acid identity.
    • IFN-alpha 1 and IFN-beta 1 share 53% nucleotide and 45% amino acid identity.
    • A composite alignment revealed 58% nucleotide and 31% amino acid conservation across four repeat segments.

    Conclusions:

    • The human IFN-alpha 1 and IFN-beta 1 genes possess significant internal duplication and sequence homology.
    • These findings suggest a common evolutionary origin, likely through gene duplication events.
    • The identified sequence relationships provide a basis for comparing these and other related genes.