# Nogo receptor 1 confines a disinhibitory microcircuit to the critical period in visual cortex
> Stephany C.É.

URL kanonis: https://discover.unhas.ac.id/publications/pub_scopus_84992738331
Jurnal / Konferensi: Journal of Neuroscience
Tahun terbit: 2016
DOI: https://doi.org/10.1523/JNEUROSCI.0935-16.2016
ISSN: 02706474
Kuartil SJR: Q1
Citations: 34

## Authors
- Stephany C.É.

## Abstract
A characteristic of the developing mammalian visual system is a brief interval of plasticity, termed the “critical period,” when the circuitry of primary visual cortex is most sensitive to perturbation of visual experience. Depriving one eye of vision (monocular deprivation [MD]) during the critical period alters ocular dominance (OD) by shifting the responsiveness of neurons in visual cortex to favor the nondeprived eye. A disinhibitory microcircuit involving parvalbumin-expressing (PV) interneurons initiates this OD plasticity. The gene encoding theneuronal nogo-66-receptor 1(ngr1/rtn4r) is required to close the critical period. Here we combined mouse genetics, electrophysiology, and circuit mapping with laser-scanning photostimulation to investigate whether disinhibition is confined to the critical period byngr1. We demonstrate thatngr1mutant mice retain plasticity characteristic of the critical period as adults, and thatngr1operates within PV interneurons to restrict the loss of intracortical excitatory synaptic input following MD in adult mice, and this disinhibition induces a “lower PV network configuration” in both critical-period wild-type mice and adultngr1−/−mice. We propose thatngr1limits disinhibition to close the critical period for OD plasticity and that a decrease in PV expression levels reports the diminished recent cumulative activity of these interneurons. SIGNIFICANCE STATEMENTLife experience refines brain circuits throughout development during specified critical periods. Abnormal experience during these critical periods can yield enduring maladaptive changes in neural circuits that impair brain function. In the developing visual system, visual deprivation early in life can result in amblyopia (lazy-eye), a prevalent childhood disorder comprising permanent deficits in spatial vision. Here we identify that thenogo-66 receptor 1gene restricts an early and essential step in OD plasticity to the critical period. These findings link the emerging circuit-level description of OD plasticity to the genetic regulation of the critical period. Understanding how plasticity is confined to critical periods may provide clues how to better treat amblyopia.

## Keywords
- Period (music)
- Neuroscience
- Visual cortex
- Psychology
- Cortex (anatomy)
- Art
- Aesthetics

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Sumber: Discover Unhas — RIMS Universitas Hasanuddin.
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