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Related Experiment Videos

Cloning of a human complement component C4 gene.

M C Carroll, R R Porter

    Proceedings of the National Academy of Sciences of the United States of America
    |January 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers isolated six cosmid clones containing the complete human complement C4 gene. Sequence analysis revealed an intron in the genomic sequence, differing slightly from the cDNA probe.

    Area of Science:

    • Genomics
    • Molecular Biology
    • Immunology

    Background:

    • The fourth component of human complement (C4) plays a crucial role in the immune system.
    • Understanding the genetic structure of C4 is essential for studying complement-mediated diseases.

    Purpose of the Study:

    • To identify and characterize genomic clones encoding the human C4 gene.
    • To compare the genomic sequence with existing cDNA to identify structural differences.

    Main Methods:

    • Screening of a human genomic library using a specific cDNA probe (Alu-7).
    • Isolation and analysis of cosmid clones via restriction digestion and Southern blotting.
    • Nucleotide sequence comparison between genomic clone Cos-A and cDNA clone Alu-7.

    Main Results:

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    • Six overlapping cosmid clones, each approximately 40 kb, were isolated.
    • All clones likely contain the complete human C4 gene.
    • Sequence comparison identified a 1,500-base-pair intron in the genomic sequence not present in the cDNA.
    • Predicted amino acid sequence closely matched the known C4d region, with one discrepancy.

    Conclusions:

    • The study successfully isolated and characterized genomic clones of the human C4 gene.
    • The identified intron represents a key difference between the genomic and cDNA sequences.
    • Further investigation is warranted to understand the functional implications of the sequence variation.