Abstract
Neural circuits are shaped by experience during periods of heightened brain plasticity in early postnatal life. Exposure to acoustic features produces age-dependent changes through largely unresolved cellular mechanisms and sites of origin. We isolated the refinement of auditory thalamocortical connectivity by in vivo recordings and day-by-day voltage-sensitive dye imaging in an acute brain slice preparation. Passive tone-rearing modified response strength and topography in mouse primary auditory cortex (A1) during a brief, 3-d window, but did not alter tonotopic maps in the thalamus. Gene-targeted deletion of a forebrain-specific cell-adhesion molecule (Icam5) accelerated plasticity in this critical period. Consistent with its normal role of slowing spinogenesis, loss of Icam5 induced precocious stubby spine maturation on pyramidal cell dendrites in neocortical layer 4 (L4), identifying a primary locus of change for the tonotopic plasticity. The evolving postnatal connectivity between thalamus and cortex in the days following hearing onset may therefore determine a critical period for auditory processing.
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Acknowledgements
Icam5−/− mice and antibody were kindly provided by M. Mishina (University of Tokyo) and Y. Yoshihara (RIKEN BSI), respectively. We thank M. Nakamura, A. Takesian, N. Gogolla, E.-J. Yang, K. Quast, M. Marcotrigiano, M. Kelly, R. Pavlyuk, B. Jones O'Brien and V. Khatri for technical assistance and comments. This work was supported by Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (T.K.H.), the Human Frontiers Science Program (T.K.H.), the National Institute on Deafness and Other Communication Disorders (grant 009836, D.B.P.) and the Harvard Society of Fellows (T.R.B.).
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T.R.B. performed all of the in vitro experiments and analysis. D.B.P. performed or supervised the in vivo experiments and analysis. T.R.B., D.B.P. and T.K.H. designed the study and wrote the paper.
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Barkat, T., Polley, D. & Hensch, T. A critical period for auditory thalamocortical connectivity. Nat Neurosci 14, 1189–1194 (2011). https://doi.org/10.1038/nn.2882
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DOI: https://doi.org/10.1038/nn.2882
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