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Related Experiment Videos

The human complement component C8B gene: structure and phylogenetic relationship

T Kaufmann1, C Rittner, P M Schneider

  • 1Institut für Rechtsmedizin, Johannes-Gutenberg-Universität, Mainz, Germany.

Human Genetics
|August 1, 1993
PubMed
Summary
This summary is machine-generated.

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Researchers characterized the human C8B gene, identifying its 12 exons and approximately 40 kb size. This study details the gene structure and confirms evolutionary links between complement components.

Area of Science:

  • Molecular Biology
  • Genetics
  • Immunology

Background:

  • The eighth component of human complement (C8) is crucial for the membrane attack complex.
  • C8 comprises alpha, beta, and gamma chains, encoded by C8A, C8B, and C8G genes.
  • The C8 beta-subunit is non-covalently associated with the alpha-gamma subunit in serum.

Purpose of the Study:

  • To isolate and characterize the full-length human C8B gene.
  • To determine the genomic structure, including exons and introns, of the C8B gene.
  • To investigate potential genetic polymorphisms and evolutionary relationships.

Main Methods:

  • Isolation of human genomic lambda DNA clones using a C8 beta cDNA probe.
  • TaqI restriction mapping and shotgun subcloning into M13.

Related Experiment Videos

  • Partial sequencing of subcloned fragments to identify exons.
  • Polymerase chain reaction (PCR) amplification using intronic primers.
  • Restriction fragment analysis for polymorphism detection.

    • Main Results:

    • The human C8B gene comprises 12 exons, ranging from 69 to 347 bp.
    • All intron-exon junctions adhere to the GT-AG rule.
    • The total size of the C8B gene is approximately 40 kb.
    • A polymorphic TaqI site was identified in intron 11.
    • Exon structure analysis confirmed homology with C8A and C9, supporting evolutionary relationships.

    Conclusions:

    • The genomic organization of the human C8B gene has been elucidated.
    • The identified polymorphism in intron 11 may be useful for genetic studies.
    • The findings reinforce the evolutionary relatedness of complement components C8A, C8B, and C9.