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Related Experiment Videos

Complete cDNA sequence of human preceruloplasmin.

M L Koschinsky, W D Funk, B A van Oost

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1986
    PubMed
    Summary

    Researchers identified human ceruloplasmin cDNA using gene sequencing. They discovered a probable signal peptide and found sequence homology with clotting factor VIII, suggesting a common evolutionary ancestor.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Ceruloplasmin is a key copper-binding protein involved in iron transport and antioxidant functions.
    • Understanding ceruloplasmin gene structure is crucial for studying its role in health and disease.

    Purpose of the Study:

    • To isolate and characterize complementary DNA (cDNA) clones encoding human ceruloplasmin.
    • To investigate the structure of ceruloplasmin mRNA and explore potential evolutionary relationships.

    Main Methods:

    • Screening of human liver cDNA libraries using synthetic oligonucleotide probes.
    • Construction of a lambda gt10 cDNA library and screening with a phCP1 fragment.
    • Reverse transcription of poly(A)+ RNA and blot hybridization analysis.
    • Comparison of nucleotide sequences with human clotting factor VIII cDNA.

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    Main Results:

    • Isolated cDNA clones (phCP1 and lambda hCP1) representing different regions of human ceruloplasmin mRNA.
    • Identified a probable signal peptide and coding sequences for residues 202-1046 and 1-380.
    • Determined ceruloplasmin mRNA size in liver and HepG2 cells (3700 nucleotides) and identified a larger variant (4500 nucleotides).
    • Revealed sequence homology between human ceruloplasmin and clotting factor VIII cDNAs.

    Conclusions:

    • Successfully cloned and sequenced key portions of human ceruloplasmin cDNA.
    • Characterized ceruloplasmin mRNA size and identified a larger transcript variant.
    • Suggests a common evolutionary origin for ceruloplasmin and clotting factor VIII.