Brain plasticity at the right time and place is of paramount importance during development with lasting consequence throughout life. Just as sensory input in early life shapes primary sensory cortex, emotional experience may shape the limbic-cortical relay system. Fibers from the BLA actively sprout within the mPFC during the post-weanling period, forming increased contacts with GABAergic interneurons as late as the early adult period. This connectivity requires further evaluation ultrastructurally (with Lichtman), and the identity of the receptors at these appositions merits investigation (with Zhuang). Here, we focus on the shift of neural circuit mechanisms from amygdala to mPFC underlying fear extinction across development. Using these stages as a milestone, we will measure developing synaptic inputs onto individual PV-cells of the mPFC by whole-cell recording techniques in slices from PV-EGFP mice crossed to various mouse models. The maturational state of afferents from the BLA in particular, will be examined by optogenetic tagging of this projection. Ultimately, we aim to determine whether dynamic epigenetic regulation (such as by imprinted genes identified by Dulac) dictates the functional maturation of these pivotal cortical inhibitory circuits. Identifying cell-specific mechanisms that underlie epigenetic regulation of critical periods may provide valuable insight into potential circuit-based therapies for pathologies arising from aberrant environment-gene interactions.
We will identify functional alterations of mPFC PV-cell inputs / outputs across development that may be altered in mouse models of mental illness. These behavioral and synaptic measures will inform the genomic (Dulac) and connectomic (Lichtman) approaches, as well as provide the brain samples at the relevant stages.
|Mierau, Susanna B; Patrizi, Annarita; Hensch, Takao K et al. (2016) Cell-Specific Regulation of N-Methyl-D-Aspartate Receptor Maturation by Mecp2 in Cortical Circuits. Biol Psychiatry 79:746-54|
|Morgan, Josh Lyskowski; Berger, Daniel Raimund; Wetzel, Arthur Willis et al. (2016) The Fuzzy Logic of Network Connectivity in Mouse Visual Thalamus. Cell 165:192-206|
|Perez, Julio D; Rubinstein, Nimrod D; Dulac, Catherine (2016) New Perspectives on Genomic Imprinting, an Essential and Multifaceted Mode of Epigenetic Control in the Developing and Adult Brain. Annu Rev Neurosci 39:347-84|
|Kobayashi, Yohei; Ye, Zhanlei; Hensch, Takao K (2015) Clock genes control cortical critical period timing. Neuron 86:264-75|
|Perez, Julio D; Rubinstein, Nimrod D; Fernandez, Daniel E et al. (2015) Quantitative and functional interrogation of parent-of-origin allelic expression biases in the brain. Elife 4:e07860|
|Kaynig, Verena; Vazquez-Reina, Amelio; Knowles-Barley, Seymour et al. (2015) Large-scale automatic reconstruction of neuronal processes from electron microscopy images. Med Image Anal 22:77-88|
|Santoro, Stephen W; Dulac, Catherine (2015) Histone variants and cellular plasticity. Trends Genet 31:516-27|
|Sigal, Yaron M; Speer, Colenso M; Babcock, Hazen P et al. (2015) Mapping Synaptic Input Fields of Neurons with Super-Resolution Imaging. Cell 163:493-505|
|Morishita, Hirofumi; Cabungcal, Jan-Harry; Chen, Ying et al. (2015) Prolonged Period of Cortical Plasticity upon Redox Dysregulation in Fast-Spiking Interneurons. Biol Psychiatry 78:396-402|
|Do, Kim Q; Cuenod, Michel; Hensch, Takao K (2015) Targeting Oxidative Stress and Aberrant Critical Period Plasticity in the Developmental Trajectory to Schizophrenia. Schizophr Bull 41:835-46|
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