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Resource sharing in cells: the case of competitive actin structures

Ziel

Cells face a fundamental challenge: building multiple essential structures that continually renew themselves through dynamic turnover, from a limited pool of monomeric actin, the protein that forms the backbone of cell shape and movement. Despite the fundamental importance of this resource allocation problem, the mechanistic principles governing how these dynamic structures compete for limiting actin while maintaining coexistence remain unknown.
This project will crack the code of cellular resource allocation by revealing how actin turnover governs the delicate balance between competing structures. The hypothesis is that turnover kinetics serve as the primary determinant of structure’s ability to sequester limited actin resources and adapt to perturbations. We will use an innovative dual approach, based on the complementarity between a cutting-edge biomimetic system (coupled with a predictive mathematical model) and a quantitative cellular system. We will first develop biomimetic systems that reconstitute dynamic competing actin structures (branched networks, linear bundles) from purified components and shared monomer pools. By systematically varying nucleator densities and disassembly rates, we will derive quantitative rules governing structural competition and coexistence under resource limitation. We will then validate these principles in living cells, testing whether faster turnover rates truly determine a structure's competitive advantage and adaptive capacity. By manipulating turnover dynamics, we will demonstrate how cells fine-tune their architecture in real-time to meet changing demands.
This research will reveal how cells coordinate multiple competing structures from shared molecular components. Understanding these mechanisms will illuminate how life efficiently organizes complex systems from simple components—a fundamental question spanning from molecular biology to ecosystem dynamics.

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Finanzierungsplan

HORIZON-ERC - HORIZON ERC Grants

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Aufforderung zur Vorschlagseinreichung

(öffnet in neuem Fenster) ERC-2026-STG

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Gastgebende Einrichtung

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
Netto-EU-Beitrag
€ 2 140 248,00
Adresse
RUE MICHEL ANGE 3
75794 Paris
Frankreich
Region
Ile-de-France Ile-de-France Paris
Aktivitätstyp
Research Organisations
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Gesamtkosten
€ 2 140 248,00

Begünstigte (1)