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FRONTIERS OF RNAI-II

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High resolution and chemical genetic approaches to RNA silencing mechanisms

In eukaryotes, silencing small (s)RNAs, including micro (mi)RNAs and small interfering (si)RNAs, regulate many aspects of biology, including cell differentiation, development, hormonal responses, or defense. In particular, many pl... ver más

30/06/2018

ETH Zürich

2M€

Presupuesto del proyecto: 2M€

Líder del proyecto

EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH No se ha especificado una descripción o un objeto social para esta compañía.

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2018-06-30 No tenemos la información de la convocatoria

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ETH Zürich

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Líder del proyecto

EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH No se ha especificado una descripción o un objeto social para esta compañía.

Presupuesto del proyecto 2M€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto In eukaryotes, silencing small (s)RNAs, including micro (mi)RNAs and small interfering (si)RNAs, regulate many aspects of biology, including cell differentiation, development, hormonal responses, or defense. In particular, many plant and metazoan miRNAs play crucial roles in embryonic/post-embryonic development; the precise timing and localization of their expression is thus crucial to their action. Hence, specific miRNA repertoires underlie specific cell identities, and deviations from such repertoires often have deleterious consequences such as cancer. Many miRNAs also help organisms to adapt to stress, thus, given their importance in virtually all aspects of biology, understanding how, when and where miRNAs exert their actions is of paramount importance. To date, however, the few approaches to miRNA-mediated silencing in whole organisms have not taken into account the exquisite definition, in space and time, of their biogenesis and action, leading to an inaccurate view of the biology of these molecules at the systems level. Using the root system of the model plant Arabidopsis thaliana, we propose to explore, at single-cell and subcellular resolution levels, the biology of the main miRNA effector protein, ARGONAUTE 1 (AGO1) in intact tissues. Using a combination of state-of the-art technologies for single-cell forward genetics, protein purification and RNA/polysome profiling, we will establish a functional spatiotemporal map of the root AGO1-sRNAome and identify cell-specific modifiers of sRNA biogenesis and action. As a complement to the above approaches, chemical genetics will isolate small molecules allowing direct and specific manipulation of AGO1-dependent sRNA pathways in planta. RNA silencing modifier compounds will also accelerate forward and reverse approaches of RNA silencing in plants with sensitized genetic backgrounds, and uncover novel connections between miRNA/siRNA and physiological or metabolic pathways.

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