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• W2894831128 abstract "PAX6-related Aniridia is a sight-threatening disease involving progression of secondary glaucoma and aniridia related keratopathy (ARK). Change or loss of limbal epithelial progenitors causes epithelial surface defects. We analyzed the effect of PAX6 on mRNA expression changes with a two-step approach, as follows. First, we sequenced mRNA from limbal epithelial cells isolated from controls and aniridia patients. Second, we confirmed the bioinformatics and literature-based result list for a small interfering RNA (siRNA)-based primary aniridia cell model (PAX6 knockdown). With this approach, we expected that the genes directly influenced by PAX6 would be distinguishable from those affected secondarily by the ARK disease state. Therefore, epithelial cells were isolated from the limbus region of two patients with aniridia and cultured in keratinocyte serum-free medium. Normal control cells were obtained from the limbus region of corneal donors. For the siRNA-based aniridia cell model, cells were transfected with Lipofectamine and 5 nM siRNA against PAX6 or control treatment. All cells were lysed to yield DNA, RNA, and protein. Reduction of PAX6 protein was assessed by western blot. Aniridia and control Poly-A–enriched RNA libraries were subjected to next-generation sequencing. The differential analysis was a combination of quantification with RSEM and differential tests with edgeR. Gene lists were filtered by comparison to NCBI GEO datasets, annotated with DAVID, and manually annotated using a literature search. Based on the resulting filtered gene list, qPCR primers were purchased, and candidate genes (TP63, ABCG2, ADH7, ALDH1A1, PITX1, DKK1, DSG1, KRT12, KRT3, KRT13, SPINK6, SPINK7, CTSV, SERPINB1) were verified by qPCR on the siRNA-based aniridia cell model. We identified genes that might be regulated by PAX6 and showed that SPINK7 mRNA, which codes for a protease inhibitor, is downregulated in patients as well as in our primary aniridia cell model. ALDH1A1 and AHD7 mRNA levels were reduced in limbal epithelial cells of aniridia patients, and both transcripts were downregulated by PAX6 knockdown in our cell model. This siRNA-based aniridia cell model is a valuable tool for confirming identified PAX6-affected genes that might promote ARK pathogenesis. The model recapitulated expression changes for SPINK7, ADH7, and ALDH1A1 that were also observed in patient samples. These results provide evidence that PAX6 might drive corneal epithelial differentiation by direct or indirect control of retinoic acid signaling processes through ADH7 and ALDH1A1." @default.
• W2894831128 created "2018-10-12" @default.
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• W2894831128 date "2019-02-01" @default.
• W2894831128 modified "2023-10-16" @default.
• W2894831128 title "Expression of retinoic acid signaling components ADH7 and ALDH1A1 is reduced in aniridia limbal epithelial cells and a siRNA primary cell based aniridia model" @default.
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• W2894831128 doi "https://doi.org/10.1016/j.exer.2018.10.002" @default.
• W2894831128 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30292490" @default.
• W2894831128 hasPublicationYear "2019" @default.
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