Mechanisms of small RNA biogenesis and action

Group leader : Todd BLEVINS

Research area

Owing to their phenotypic plasticity, terrestrial plants provide humans with sources of nutrition, fiber, energy and medicinal compounds. Small-interfering RNAs (siRNAs) of 20-24 nucleotide length support this plasticity via conserved silencing mechanisms that tune gene regulatory networks and protect genomic integrity. When bound to a suitable effector protein, a siRNA molecule conveys sequence information needed to discriminate target from non-target RNAs. One class of endogenous siRNAs targets cleavage of cellular mRNAs to regulate development, whereas another guides DNA methylation to silence transposons, helping to prevent deleterious mutations. Methylation of transposons can also affect flanking genes, allowing states of gene expression to be inherited epigenetically over cell divisions and successive plant generations. Given the functional specialization of each siRNA class, a failure to synthesize their double-stranded RNA precursors from appropriate source loci, or errors in channeling siRNAs to appropriate effector proteins can disrupt development and/or render cells vulnerable to mutations and disease. Our team studies mechanisms that safeguard the biogenesis of siRNAs in distinct pathways to preserve their specialized silencing functions in the model plant Arabidopsis thaliana.

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Members

Selected publications

  • THIEME M., MINADAKIS N., HIMBER C., KELLER B., XU W., RUTOWICZ K., MATTEOLI C., BÖHRER M., RYMEN B., LAUDENCIA-CHINGCUANCO D., VOGEL J., SIBOUT R., STRITT C., BLEVINS T. and ROULIN A.C.

    Transposition of HOPPLA in siRNA-deficient plants suggests a limited effect of the environment on retrotransposon mobility in Brachypodium distachyon

    PLoS Genetics, 20(3):e1011200, 2024. | DOI : 10.1371/journal.pgen.1011200DOI logo

  • WIERZBICKI A., BLEVINS T. and SWIEZEWSKI S.

    Long Noncoding RNAs in Plants

    Annual Review of Plant Biology, 72:245-271, 2021. | DOI : 10.1146/annurev-arplant-093020-035446DOI logo

  • BÖHRER M., RYMEN B., HIMBER C., GERBAUD A., PFLIEGER D., LAUDENCIA-CHINGCUANCO D., CARTWRIGHT A., VOGEL J., SIBOUT R. and BLEVINS T.

    Integrated genome-scale analysis and northern blot detection of retrotransposon siRNAs across plant species

    In: Heinlein M. (ed) RNA tagging. Methods in Molecular Biology, vol 2166. Humana New York, NY., 2020. | DOI : 10.1007/978-1-0716-0712-1_23DOI logo

  • FERRAFIAT L., PFLIEGER D., SINGH J., THIEME M., BÖHRER M., HIMBER C., GERBAUD A., BUCHER E., PIKAARD C.S. and BLEVINS T.

    The NRPD1 N-terminus contains a Pol IV-specific motif that is critical for genome surveillance in Arabidopsis

    Nucleic Acids Research, 47(17):9037-9052, 2019. | DOI : 10.1093/nar/gkz618DOI logo

  • BLEVINS T., WANG J., PFLIEGER D., PONTVIANNE F. and PIKAARD C.S.

    Hybrid incompatibility caused by an epiallele

    Proceedings of the National Academy of Sciences of the United States of America, 114(14):3702-3707, 2017. | DOI : 10.1073/pnas.1700368114DOI logo