How the sequential specification of neurons and progressive loss of potency associated with aging neural progenitors are regulated in vertebrate brain development is poorly understood.
Both contribute to the specification of aPPs, and their loss leads to abnormal eye development in chick and zebrafish.
Meanwhile, PntP1 must be regulating the expression of other unknown target gene(s) that are/is essential for the generation of INPs, such as specification of immature INPs, because loss of Ase is not sufficient to promote the generation of INP-like cells in any type I NB lineages.
Because loss of GABAergic neurons is the most prominent phenotype arising from this mis-specification, ZC4H2 loss of function may therefore result in hyperexcitability of multiple brain and spinal circuits.
As such, there is no subtle characterization and specification of the burstiness of the packet loss processes.
The phenotypic consequences of the loss of Phyl function in the developing eye include the loss of R1, R6 and R7 photoreceptor cells, over-specification of the non-neuronal cone and pigment cells and a loss in the specification of bristle complex (Chang et al, 1995; Dickson et al, 1995).
We suggest that the sea urchin embryo may simply undergo a relatively more rapid specification of these territories, with an associated loss of intermediate domains that we observe in the sea star.
Our study has revealed a striking asymmetry in response of habenular neurons to sensory stimuli and has shown that perturbations disrupting the specification of brain asymmetry result in the loss of ability of this region of the brain to respond appropriately to visual or olfactory cues.
Recent data show that ATHB8 expression is regulated directly by MP, is required for procambial cell specification, and its loss of function phenotype is masked by MP function [16].
We show that BMP signalling inhibits skeletal muscle specification, via the loss of Pax3 and Meox1, while RA enhances this step.
