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A complete complementary DNA for the oncodevelopmental calcium-binding protein, oncomodulin.

M F Gillen, D Banville, R G Rutledge

    The Journal of Biological Chemistry
    |April 15, 1987
    PubMed
    Summary
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    Researchers identified rat oncomodulin mRNA in liver tumors and placentas, but not normal liver tissue. This calcium-binding protein gene shows unique evolutionary divergence from calmodulin.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Oncomodulin is a calcium-binding protein.
    • Its expression patterns and evolutionary relationships are not fully understood.

    Purpose of the Study:

    • To determine the complete coding sequence of rat oncomodulin mRNA.
    • To investigate the expression of oncomodulin in different rat tissues and species.
    • To compare the oncomodulin gene's evolutionary divergence with other calcium-binding proteins.

    Main Methods:

    • Construction of complementary DNAs (cDNAs) from rat liver tumor RNA.
    • Primer extension analysis to determine mRNA length.
    • RNA blot analysis to detect oncomodulin expression.
    • DNA hybridization studies to analyze gene presence across species.

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    Main Results:

    • The complete rat oncomodulin mRNA is approximately 680 nucleotides long, with specific lengths for untranslated and coding regions.
    • Oncomodulin mRNA was detected in rat liver tumors, rat placentas, and human placentas, but not in normal adult rat liver.
    • The oncomodulin gene shares 59% nucleotide sequence identity in the coding region with parvalbumin cDNA.
    • Oncomodulin shows greater evolutionary divergence from calmodulin than parvalbumin does.

    Conclusions:

    • Rat oncomodulin is expressed in specific tissues, including tumors and placentas, but not in normal liver.
    • The oncomodulin gene has a distinct evolutionary history compared to calmodulin and parvalbumin.
    • Further research into oncomodulin's function and regulation is warranted.