Modeling synchronization in C. elegans links structural wiring, gap junctions, and behavioral circuits

# Why this matters Caenorhabditis elegans has a nearly complete structural connectome, but how that wiring maps onto functional interactions and behavior is unresolved. This study uses a biologically motivated computational model that embeds the known anatomical connectome, then stimulates individual neurons to observe network-wide oscillatory responses and infer functional connectivity.

# What the authors did

# Main empirical findings

• Functional connectivity is uneven: some neuron pairs and groups interact more strongly, forming identifiable functional communities.
• Electrical synapses (gap junctions) are central to shaping those communities. The mesoscale functional architecture shows strong assortative structure with respect to gap junction connectivity.
• Locomotion circuits are largely mapped onto distinct, segregated functional communities, implying a more modular functional organization for movement control.
• Other behavioral systems, notably sensory circuits (chemosensation, mechanosensation), are distributed across multiple functional communities rather than confined to one.
• Stimulating neurons that belong to distributed circuits tends to produce stronger, more synchronized network responses than stimulating neurons contained within segregated locomotion communities. This pattern matches behavioral motifs where activity in one circuit leads to activation of another (for example, chemosensory input leading to locomotion).
• The model also reproduces a wide variety of chimera-like synchronization patterns—coexistence of synchronized and desynchronized neuron groups—especially when stimulating certain sensory neurons. These patterns point to high dynamical flexibility in the network.

# Interpretation and implications

# Practical takeaways for researchers

• Identifying whether a behavior maps to segregated or distributed functional communities can predict how localized stimulation will spread and whether it will produce global synchronization.

# Data and code The authors used open C. elegans anatomical data available via WormAtlas and published sources for the model description. Their simulation code is available on GitHub at the repository listed in the paper.

# Bottom line A connectome-driven computational model shows that electrical synapses largely determine mesoscale functional communities, that locomotion circuits are functionally segregated while sensory circuits are distributed, and that distributed circuits are more likely to evoke synchronized, sometimes chimera-like, responses when stimulated. These patterns clarify when and how structural wiring predicts functional coupling in a complete nervous system.