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• W2019913736 abstract "Apobec-1 catalyzes C to U editing of apolipoprotein B (apoB) mRNA in the mammalian intestine. Rat apobec-1 is transcribed from three distinct promoters, which contain distinct 5' untranslated regions (5'UTRs) accompanied by variable numbers of in-frame upstream AUGs (uAUGs). We have observed a shift in apobec-1 promoter usage in an experimental model of colon carcinogenesis, resulting in transcripts loaded with 5'AUGs. In colon cancer, apobec-1 protein levels decreased by 90% in the cancer tissue as compared to normal tissue, suggesting an inhibitory effect of the 5'UTR on apobec-1 translation. We investigated the effects of these different 5'UTRs by site-directed mutagenesis coupled with in vitro translation studies. These studies established that the uAUGs within the 5'UTR of the alternative transcripts inhibit apobec-1 translation. This effect was independent of the length of the 5'UTR. Further analysis demonstrated that these uAUGs altered the polysome distribution, shifting the mRNA towards a denser, post-polyribosomal fraction. These findings were confirmed in transient transfection studies in vivo using HepG2 cells, where functional expression of apobec-1 was restored by mutagenesis of the uAUGs. Taken together, these data imply that rat apobec-1 gene expression is downregulated through alternative promoter usage. This dominant translational control of apobec-1 gene expression is most plausibly exerted through uAUGs." @default.
• W2019913736 created "2016-06-24" @default.
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• W2019913736 date "2002-05-01" @default.
• W2019913736 modified "2023-09-27" @default.
• W2019913736 title "Apobec-1 transcription in rat colon cancer: decreased apobec-1 protein production through alterations in polysome distribution and mRNA translation associated with upstream AUGs" @default.
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• W2019913736 doi "https://doi.org/10.1016/s0167-4781(02)00250-6" @default.
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