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tRNA alterations in cancer.

K Randerath, H P Agrawal, E Randerath

    Recent Results in Cancer Research. Fortschritte Der Krebsforschung. Progres Dans Les Recherches Sur Le Cancer
    |January 1, 1983
    PubMed
    Summary
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    Novel labeling methods reveal significant alterations in transfer RNA (tRNA) from hepatoma tumors, indicating potential undermethylation and undermodification. These changes in tRNA modification patterns are crucial deviations from normal function.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Oncology

    Background:

    • Transfer RNA (tRNA) plays a critical role in protein synthesis.
    • Tumorigenesis often involves alterations in cellular nucleic acid metabolism.
    • Understanding tRNA modifications in cancer is essential for identifying novel biomarkers and therapeutic targets.

    Purpose of the Study:

    • To develop sensitive labeling methods for analyzing modified nucleic acids.
    • To investigate base composition and sequence alterations in tRNA from hepatoma models.
    • To compare tRNA modifications in tumor tissues with normal liver tissue.

    Main Methods:

    • Development of 3H-, 125I-, and 32P-labeling techniques for nucleic acid analysis.
    • Base composition analysis of tRNA from Morris hepatomas 5123D and 7777.

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  • Sequence analysis of cytoplasmic and mitochondrial tRNAs from hepatoma 5123D.

    • Main Results:

    • Hepatoma tRNA exhibited altered base composition compared to liver tRNA, with a trend toward undermethylation and undermodification.
    • Sequence analysis revealed a lack of specific modified bases (m2G, Gm, Q) in hepatoma 5123D tRNA.
    • Alterations in the primary structure of mitochondrial tRNAs were observed in hepatoma 5123D, a novel finding for neoplasms.

    Conclusions:

    • Post-transcriptional modifications are crucial for tRNA function.
    • Altered tRNA modification patterns in tumors represent significant deviations from normal cellular processes.
    • Further research is needed to explore the biochemical mechanisms and functional implications of these tRNA alterations in cancer.