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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Low-Dose Ionizing Radiation Modulates Translation Efficiency in Human Lung Fibroblasts.

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    Low-dose ionizing radiation (≤ 0.1 Gy) alters cellular responses by selectively changing messenger RNA (mRNA) translation efficiency, not global protein synthesis. This reveals translation as a sensitive indicator of early radiation effects.

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    Area of Science:

    • Cellular Biology
    • Radiation Biology
    • Molecular Biology

    Background:

    • Understanding cellular responses to low-dose ionizing radiation (≤ 0.1 Gy) is critical for radiation protection.
    • High-dose radiation impacts gene expression and protein synthesis, but low-dose effects are less understood.

    Purpose of the Study:

    • To investigate the cellular impact of low-dose ionizing radiation exposure.
    • To determine if low-dose radiation affects protein synthesis and gene expression.
    • To identify specific molecular targets responding to low-dose radiation.

    Main Methods:

    • Ribosome profiling was employed on human lung fibroblast cells.
    • Cells were exposed to low (0.1 Gy) and high (1 Gy) doses of 60Cobalt gamma (γ) rays.
    • Analysis was conducted at 1 and 6 hours postirradiation.

    Main Results:

    • Global protein synthesis remained unchanged at low doses (0.1 Gy) at 1 and 6 hours postirradiation.
    • Specific messenger RNAs (mRNAs) exhibited altered translation efficiency, indicating changes at the translational level.
    • Transcriptional changes were minimal, highlighting translation as a more sensitive readout of early low-dose γ-radiation effects.
    • The small GTP-binding protein RAB33B was identified as a translationally upregulated target.

    Conclusions:

    • Low-dose ionizing radiation primarily affects cellular responses through selective mRNA translation, not global protein synthesis.
    • Conventional transcriptome analyses may not fully capture the dynamic gene expression changes induced by low-dose radiation.
    • Selective translation plays a significant role in the distinct cellular response to low-dose irradiation.