The penetrance of AP may be influenced by the presence and type of early musical training, implying that in genetically predisposed individuals, the brain may be "particularly amenable to the establishment of new circuits or to the fine-tuning of preexisting circuits involved in pitch perception" (Baharloo et al. 1998, 2000; Gregersen et al. 2001).
Here we focus on the visual system's first synapse to examine the structural and functional consequences of sensory deprivation on the establishment of parallel circuits.
As CXCL14 is present not only in the hypothalamus, but also in the cortex and hippocampus, we speculate that CXCL14 may be required for the establishment of neural circuits that are closely linked with feeding behavior.
Moreover, evidence showed that strabismus caused extensive impairment of connections in the BA17 cortex during the critical period [33], [34], [35], as well as the impairment of BA18 horizontal connections and connections between BA17 and BA18, which in turn influenced stable establishment of neuron circuits in the visual cortex [9].
Selective elimination of neural connections plays a major role in the establishment of mature circuits.
Proteins called gamma-protocadherins are essential for the establishment of working circuits of neurons in the retina.
Nrg1 forward signalling controls the establishment of inhibitory circuits in the cortex by activating its specific receptor ErbB4, which is primarily expressed in cortical interneurons (Fazzari et al., 2010; Wen et al., 2010).
This interesting result suggests that other members of this large gene family might rescue its potential role in symbiosis through the establishment of backup circuits, such as occurs in other well studied model organisms [ 52].
Our study indicates that the Aph1bc-γ-secretase complex controls the establishment of excitatory circuits under physiological conditions at least in part through the regulation of Nrg1 intracellular signalling.
The identification and precise description of these lineages is the basis to both understanding how cellular diversity and patterning is achieved in the developing CNS and how the individual lineages (developmental units) contribute to the establishment of neural circuits (functional units).
