What does this research mean for the field?

Local Ras/actin signaling orients individual pseudopods in response to shallow chemotactic gradients. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

The research aims to understand how eukaryotic cells orient pseudopods in response to shallow chemotactic gradients.

March 10, 2026Proceedings of the National Academy of Sciences1 citationsOpen Access

Local Ras/actin signaling orients individual pseudopods in shallow gradients

PVP VANHAASTERTLeiden University

Key Points

The research aims to understand how eukaryotic cells orient pseudopods in response to shallow chemotactic gradients.
Experiments analyzed cells extending pseudopods in response to varying concentrations of chemoattractants.
The mechanism of local signaling was examined, focusing on pseudopod splitting and stabilization.
Comparative studies referenced previous work on cell movement and pseudopod dynamics.
Cells showed a directional bias in pseudopod extension based on local chemoattractant concentration.
One pseudopod in a pair is retracted while the other becomes dominant, stabilizing movement towards the attractant.
The findings suggest that cells can effectively navigate even in very weak gradients.

Abstract

Eukaryotic cells navigate effectively in very shallow chemotactic gradients.The issue is how cells analyze such dim signals.Experiments suggest that cells extend pseudopods with a directional bias imposed by the local concentration of chemoattractant (1, 2).Alonso et al. (3) describe a simple mechanism for local signaling, based on earlier work by Andrew and Insall (1) on pseudopod splitting: The extending pseudopod splits into two pseudopods, of which one is retracted and the other becomes dominant.The local gradient stabilizes the pseudopod that is extended toward the

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