Seminar - Daniel Colon-Ramos

photo of Dr. Daniel Colon-Ramos
April 10, 2017 - 12:00pm
Location: 
601 Fairchild

Department of Cell Biology and Neuroscience

Yale School of Medicine

Host: Oliver Hobert

Title: Cell biological mechanisms of synaptic assembly, plasticity and function: lessons from C. elegans

Abstract: Neural plasticity—the ability of a neuron to change its cellular properties in response to past experiences—underpins the nervous system’s capacity to form memories and actuate behaviors. How different plasticity mechanisms act together in vivo and at a cellular level to transform sensory information into behavior is not well understood. I will share our findings that in the nematode C. elegans two plasticity mechanisms—sensory adaptation and presynaptic plasticity—act within a single cell to encode thermosensory information and actuate a temperature-preference memory. Sensory adaptation enables the primary thermosensory neuron, AFD, to adjust the temperature range of its sensitivity to the local environment, thereby optimizing its ability to detect temperature fluctuations associated with migration. Presynaptic plasticity transforms this thermosensory information into a behavioral preference by gating synaptic communication between sensory neuron AFD and its postsynaptic partner, AIY. The gating of synaptic communication is regulated at AFD presynaptic sites by the conserved kinase nPKCe. Bypassing or altering AFD presynaptic plasticity predictably changes the learned behavioral preferences without affecting sensory responses. Our findings indicate that two distinct and modular neuroplasticity mechanisms function together within a single sensory neuron to encode multiple components of information required to enact thermotactic behavior. The integration of these plasticity mechanisms result in a single-cell logic system that can both represent sensory stimuli and guide memory-based behavioral preference.

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