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Related Experiment Videos

Nucleotide sequence of a human gene coding for a polypeptide hormone.

P H Seeburg, J Shine, J A Martial

    Transactions of the Association of American Physicians
    |January 1, 1977
    PubMed
    Summary

    Researchers developed a method to purify and sequence specific DNA fragments from messenger RNA (mRNA) mixtures. This approach was used to determine the DNA sequence of the human chorionic somatomammotropin gene, revealing codon usage and regulatory elements.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Gene sequencing is crucial for understanding biological functions and disease mechanisms.
    • Analyzing gene expression requires methods to link messenger RNA (mRNA) back to its DNA source.
    • Heterogeneous mRNA mixtures present challenges for isolating specific gene sequences.

    Purpose of the Study:

    • To present a general methodology for purifying and sequencing DNA fragments from a mixed mRNA population.
    • To determine a portion of the DNA sequence for the human chorionic somatomammotropin (hCS) gene.
    • To investigate codon usage and identify regulatory sequences within the hCS gene.

    Main Methods:

    • Development of a general approach to purify and sequence DNA fragments.

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  • Application of the methodology to a heterogeneous mixture of mRNAs.
  • Determination of the DNA sequence of a specific portion of the hCS gene.

    • Main Results:

    • Successful purification and sequencing of DNA fragments corresponding to the hCS gene.
    • Observation that most translation codons of the genetic code are utilized.
    • Identification of codon selectivity, potentially important for gene regulation or structure.
    • Detection of two stop codons (UAG) in the same reading frame.
    • Discovery of a "palindrome" sequence in the 3' noncoding region.

    Conclusions:

    • The presented methodology enables the analysis of specific gene sequences starting from mRNA.
    • The DNA sequence of a portion of the hCS gene was elucidated, providing insights into its genetic code usage.
    • Findings suggest potential regulatory mechanisms involving codon selectivity and noncoding regions.