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- W2565201457 abstract "The photoreceptor conserved element-1 (PCE-1) sequence is found in the transcriptional regulatory regions of many genes expressed in photoreceptors. The retinal homeobox (Rx or Rax) gene product functions by binding to PCE-1 sites. However, other transcriptional regulators have also been reported to bind to PCE-1. One of these, vsx2, is expressed in retinal progenitor and bipolar cells. The purpose of this study is to identify Xenopus laevis vsx gene products and characterize vsx gene product expression and function with respect to the PCE-1 site.X. laevis vsx gene products were amplified with PCR. Expression patterns were determined with in situ hybridization using whole or sectioned X. laevis embryos and digoxigenin- or fluorescein-labeled antisense riboprobes. DNA binding characteristics of the vsx gene products were analyzed with electrophoretic mobility shift assays (EMSAs) using in vitro translated proteins and radiolabeled oligonucleotide probes. Gene transactivation assays were performed using luciferase-based reporters and in vitro transcribed effector gene products, injected into X. laevis embryos.We identified one vsx1 and two vsx2 gene products. The two vsx2 gene products are generated by alternate mRNA splicing. We verified that these gene products are expressed in the developing retina and that expression resolves into distinct cell types in the mature retina. Finally, we found that vsx gene products can bind the PCE-1 site in vitro and that the two vsx2 isoforms have different gene transactivation activities.vsx gene products are expressed in the developing and mature neural retina. vsx gene products can bind the PCE-1 site in vitro and influence the expression of a rhodopsin promoter-luciferase reporter gene. The two isoforms of vsx have different gene transactivation activities in this reporter gene system." @default.
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- W2565201457 date "2016-01-01" @default.
- W2565201457 modified "2023-09-26" @default.
- W2565201457 title "Regulation of photoreceptor gene transcription via a highly conserved transcriptional regulatory element by vsx gene products." @default.
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