Abstract
The present study examined the expression of Pax-6 during retinal regeneration in adult newts using in situ hybridization. In a normal retina, Pax-6 is expressed in the ciliary marginal zone, the inner part of the inner nuclear layer, and the ganglion cell layer. After surgical removal of the neural retina, retinal pigment epithelial cells proliferate into retinal precursor cells and regenerate a fully functional retina. At the beginning of retinal regeneration, Pax-6 was expressed in all retinal precursor cells. As regeneration proceeded, differentiating cells appeared at the scleral and vitreal margins of the regenerating retina, which had no distinct plexiform layers. In this stage, the expression of Pax-6 was localized in a strip of cells along the vitreal margin of the regenerating retina. In the late stage of regeneration, when the layer structure was completed, the expression pattern of Pax-6 became similar to that of a normal retina. It was found that Pax-6 is expressed in the retinal precursor cells in the early regenerating retina and that the expression pattern of Pax-6 changed as cell differentiation proceeded during retinal regeneration.
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