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    MicroRNA (miRNA) strand selection, crucial for gene silencing, is influenced by 3' nucleotide asymmetry. This finding in C. elegans and human cells reveals a conserved mechanism for accurate miRNA guide strand selection in vivo.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • MicroRNA (miRNA) biogenesis involves processing double-stranded precursors into distinct guide and passenger strands.
    • The guide strand directs the miRNA-induced silencing complex (miRISC) to mRNA targets, determining its function.
    • Previous models based on 5' nucleotide identity and thermodynamics incompletely explain in vivo miRNA strand selection.

    Purpose of the Study:

    • To investigate the role of terminal nucleotide asymmetry in miRNA strand selection.
    • To identify conserved mechanisms governing guide strand selection in vivo.
    • To refine understanding of factors influencing miRNA targeting specificity.

    Main Methods:

    • Utilized Caenorhabditis elegans and human HEK293T cell models.
    • Analyzed miRNA duplex processing and strand selection.
    • Investigated the impact of 3' nucleotide variations on strand bias.

    Main Results:

    • Demonstrated a conserved role for 3' nucleotide asymmetry in miRNA strand selection across species.
    • Showed that favorable 3' nucleotides on passenger strands promote guide strand selection.
    • Identified terminal nucleotide asymmetries as key determinants of in vivo strand choice.

    Conclusions:

    • 3' nucleotide asymmetry is a significant conserved factor in miRNA strand selection.
    • This mechanism contributes to accurate selection of the functional miRNA guide strand.
    • Terminal nucleotide asymmetries on both miRNA strands collectively ensure precise target recognition by miRISC.