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- W2023625055 abstract "The Chx10 homeobox gene is expressed in neural progenitor cells during retinal development. The absence of Chx10 causes microphthalmia in humans and in the mouse mutant ocular retardation. The purpose of this study was to examine how neuronal development is affected by absence of the Chx10 transcription factor in the mouse retina.Expression of transcription factor genes, Crx, Pou4f2, and Pax6, that mark specific cell types as they begin to differentiate was analyzed by RNA in situ hybridization of retina from wild-type and Chx10-null ocular retardation mice (Chx10(or-J/or-J)). RT-PCR analysis was used to compare expression of these genes and putative targets of Crx regulation. Photoreceptor development was analyzed by using peanut agglutinin (PNA)-rhodamine and blue cone opsin antibody to label cones and rhodopsin antibody to label rods.The photoreceptor gene Crx, normally expressed during embryonic retinal development, was not detected in the embryonic mutant retina, but was expressed after birth. Expression of the targets of Crx regulation, rhodopsin, peripherin, rod phosphodiesterase beta (Pdeb), and arrestin, with the exception of interphotoreceptor retinoid binding protein (Irbp), was delayed in the Chx10(or-J/or-J) retina. Rhodopsin localization in rod outer segments was also delayed. By contrast, temporal and spatial expression of Pou4f2 and Pax6 in developing ganglion and amacrine cells and PNA and blue opsin in developing cone cells was relatively normal in the mutant.Delay of the normal temporal expression of genes essential for photoreceptor disc morphogenesis leads to failure of correct rod and cone outer segment formation in the Chx10(or-J/or-J) mutant retina. In addition, the absence of Chx10 appears to affect the development of late-born cells more than that of early-born cells, in that a low number of rods develops, whereas formation of ganglion, amacrine, and cone cells is relatively unaffected." @default.
- W2023625055 created "2016-06-24" @default.
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- W2023625055 date "2004-02-01" @default.
- W2023625055 modified "2023-09-28" @default.
- W2023625055 title "Delayed Expression of the<i>Crx</i>Gene and Photoreceptor Development in the<i>Chx10</i>-Deficient Retina" @default.
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- W2023625055 doi "https://doi.org/10.1167/iovs.03-0332" @default.
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