Dr. Sharona E. Gordon

Molecular Basis of Signal Transduction:
We are interested in the mechanisms by which sensory signals are converted into messages than can be understood by the brain. Very different types of sensory stimuli - the packet of energy contained within a photon, the chemicals that make up odors, and changes in temperature, for example - must all be converted into an electrical signal that can be carried along neurons to be processed by the brain. Not surprisingly, the link between signal transduction cascades and the requisite changes in membrane potential is mediated by members of a related family of ion channel proteins. Our lab seeks to understand how signal transduction cascades provide the energy that controls this family of ion channels.

Ion channels are enzymes that permit the flow of charged ions from one side of a cell membrane to another. Through sophisticated, low-noise recording procedures, we can measure the flow of current through an individual ion channel molecule in real time. By altering the environmental conditions on a selected side of the membrane, we can mimic the sensory stimuli that normally activate these enzymes and measure the effects of different conditions on their behavior. We are particularly interested in the molecular mechanisms by which an ion channel can integrate disparate painful signals, such as heat, acidity, and noxious chemicals. Using a combination of molecular biology, biochemistry, and electrophysiology we aim to understand the structural basis for the function of these channels and how they integrate into the sensory transduction systems in various cell types.

My lab studies the molecular basis of ion channel function using a combination of electrophysiology, molecular biology, and protein chemistry. We also use mathematical modelling to develop kinetic schemes for channel function and assess how well they canfit the data. Our current focus is on cyclic nucleotide-gated ion channels and TRP ion channels.