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- W2040543350 abstract "We reported previously that in African green monkey (AGM) CD4 lymphocytes, CD4 mRNA expression undergoes a decrease following in vitro activation, and CD4 cells are therefore subject to loss of CD4 expression on the cell surface. To examine the transcriptional regulation of the CD4 gene in this species, we analyzed the CD4 silencer, which has been identified as a regulatory element responsible for the down regulation of CD4 transcription in CD8 cell lineage cells. Sequence analysis indicated that the CD4 silencer of the AGM was highly homologous to that of humans. However, two nucleotide substitutions were present in one of the nuclear protein binding sites, which was characterized as the FP II site having a strong enhancing effect on transgene expression in CD4 cells. By performing transient transfection assays, we found that the enhancing activities of the CD4 silencer or FP II-containing fragment of the AGM were greatly reduced in a human CD4 cell line as compared to those of human materials. The CD4 mRNA level was significantly decreased in the human CD4 cell line when synthetic oligonucleotide corresponding to the human FP II sequence was added to the culture. These observations imply that FP II-protein interaction might be required for the maintenance of sufficient expression of the CD4 gene, and the enhancing activity mediated by the above interaction might be decreased in the AGM CD4 silencer, due probably to the nucleotide changes occurring at the FP II site." @default.
- W2040543350 created "2016-06-24" @default.
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- W2040543350 date "2000-12-01" @default.
- W2040543350 modified "2023-10-11" @default.
- W2040543350 title "Sequence and functional properties of African green monkey CD4 silencer" @default.
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- W2040543350 doi "https://doi.org/10.1016/s0165-2478(00)00273-x" @default.
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