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Questioning of reported evidence for guanosine tetraphosphate synthesis in a ribosome system from mouse embryos

O Martini, J Irr, D Richter

    Cell
    |December 1, 1977
    PubMed

    Insights

    Cytosolic ribosomes in mouse embryos do not synthesize guanosine tetraphosphate (ppGpp), challenging previous findings. This suggests ppGpp may not play a role in embryonic differentiation as once proposed.

    Area of Science:

    • Molecular Biology
    • Developmental Biology
    • Cell Biology

    Background:

    • Previous research in 1974 suggested guanosine tetraphosphate (ppGpp) synthesis by cytosolic ribosomes in mouse embryos.
    • A role for ppGpp in embryonic differentiation was proposed based on these earlier findings.

    Purpose of the Study:

    • To re-evaluate the role of cytosolic ribosomes in ppGpp formation during mouse embryonic development.
    • To challenge the established hypothesis regarding ppGpp's function in differentiation.

    Main Methods:

    • Investigating the activity of ribosomes from mouse embryos at various developmental stages.
    • Assessing ppGpp formation in mouse embryoid bodies.

    Main Results:

    • Ribosomes isolated from mouse embryos across different developmental stages showed no ppGpp synthesis.
    • Mouse embryoid body ribosomes were also inactive in ppGpp formation.

    Conclusions:

    • The previously reported synthesis of ppGpp by mouse embryonic cytosolic ribosomes is not reproducible.
    • The proposed role of ppGpp in mouse embryonic differentiation is unlikely given the lack of ribosomal synthesis.

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