RESEARCH OVERVIEW
Across the animal kingdom, the vast majority of neurons in the adult brain have been generated and integrated into neuronal circuits during embryogenesis. The number and composition of post-mitotic neurons do not change much across post-natal lifespan, yet our behaviors vary dramatically across different developmental stages. How can this be?
Previous research has shown that post-mitotic neurons continue to change phenotypic properties (for example, electrophysiological properties) and rewire synaptic connections throughout post-natal juvenile stages until an animal has reached a fully mature state in adulthood. Components of the intricately timed maturation process occur independent of the individual’s experience and exposure to environmental stimuli, and suggest that cell-intrinsic genetic timer mechanisms coordinate the maturation of the nervous system. Simultaneously, neurons adapt to changing environmental conditions throughout their long post-mitotic lifespan to accommodate processes such as learning.
At the intersection of neuroscience, developmental biology, genomics and genetics, the central question that the Sun Lab is addressing is how post-mitotic neurons integrate cell-intrinsic genetic timer programs and cell-extrinsic environmental inputs to regulate the progression of the nervous system’s plastic molecular and functional states across post-natal lifespan.