Dr. Talmage received his B.A. in Biology from the University of Virginia and his Ph.D. in Genetics from the University of Minnesota. After post-doctoral work at Rockefeller University and Harvard Medical School he joined the faculty at Columbia University and then at Stony Brook University. He joined the IRP at NIH in 2019 and moved to NINDS in 2021. His laboratory studies mechanisms of signaling within axons that contribute to synapsis formation and maintenance.
Both stability and flexibility of neural circuits are required for proper brain development, learning, memory and behavior. Dynamic signaling between cells, at synapses and among circuits is the essential scaffold upon which brain function is built. Our research attempts to answer the broad question of how specific signal transduction events in axons contribute to the formation, function and maintenance of key synapses and circuits in general, and especially, of cholinergic circuits in the central nervous system (CNS).
Current efforts focus on two questions:
- How does Neuregulin 1 signaling contribute to the development of the nervous system, in general, and more specifically to forebrain cholinergic signaling? Altered Nrg1 signaling in the CNS leads to profound alterations in synaptic plasticity at glutamatergic synapses, loss of synaptic modulation by acetylcholine and behavioral deficits. A major ongoing effort has focused on dissecting how the different modes of Nrg1 signaling contribute to these diverse phenotypes.
- What is the functional significance of heterogeneity in the basal forebrain cholinergic system? Cholinergic signaling in the CNS is implicated in attention, learning and memory. Altered cholinergic activity is a well-documented component of neuropsychiatric and neurodegenerative disorders (e.g., schizophrenia, Post-traumatic Stress Disorder, Alzheimer’s disease, Parkinson’s disease). To gain a better understanding of how altered cholinergic signaling contributes to aspects of psychiatric disorders, we are pursuing studies aimed at gaining a deeper, mechanistic understanding of which populations of cholinergic neurons contribute to the formation and retrieval of specific memories, and what factors distinguish cholinergic neurons that are resilient to the insults of aging from those that succumb to these insults.
Li Bai (lab manager)
Prithviraj Rajebhosale (Visiting Fellow)
Ron Kim (Post-doctoral Fellow)
Joe Cesare (Post-bac)