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Related Experiment Videos

Isolation of a cDNA clone encoding pancreatic polypeptide.

T Takeuchi, T Yamada

    Proceedings of the National Academy of Sciences of the United States of America
    |March 1, 1985
    PubMed
    Summary

    Researchers isolated a human pancreatic polypeptide cDNA clone from a pancreatic neoplasm. This clone, 465 base pairs long, revealed a 95-amino acid peptide with potential genetic variations.

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    Area of Science:

    • Molecular Biology
    • Endocrinology
    • Genetics

    Background:

    • Pancreatic polypeptide (PP) is a hormone produced in the endocrine pancreas.
    • Understanding PP's genetic basis is crucial for studying pancreatic neoplasms.

    Purpose of the Study:

    • To isolate and characterize the cDNA encoding human pancreatic polypeptide.
    • To investigate potential genetic variations in the PP gene.

    Main Methods:

    • Construction of a cDNA library from human pancreatic endocrine neoplasm RNA.
    • Cloning of the cDNA into plasmid pBR322 in Escherichia coli.
    • Use of specific oligonucleotide probes for hybridization and isolation of the PP cDNA.

    Main Results:

    • Isolation of a 465 base pair cDNA clone encoding a 95-amino acid peptide.
    • Identification of a 36-amino acid PP sequence, a 29-amino acid leader, and a 27-amino acid C-terminal peptide.
    • Discovery of an isoleucine substitution for valine in the C-terminal peptide, potentially due to an A-G nucleotide substitution.

    Conclusions:

    • The study successfully isolated and characterized the human pancreatic polypeptide cDNA.
    • A potential genetic variation or point mutation in the PP gene was identified, warranting further investigation.

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