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- W2026006075 abstract "Down regulation of gene expression by antisense RNA is one of the ways to investigate the specific contribution of certain components to the physiology and activities of a cell. A successful inhibition of gene expression in Entamoeba trophozoites was achieved in stable transfectants by using hybrid plasmid constructs containing promotors that produce transcripts which do not bind to polysomes. Different promotors were found to be required for Entamoeba histolytica or Entamoeba dispar. In E. histolytica one of the two copies (g34) of the gene coding for ribosomal protein L21 was previously found to be transcribed but not translated. Inhibition of gene expression was obtained by placing in a transfection vector, the amoebapore A gene, in its antisense orientation, under the control of the g34 promotor. Transfectants of E. histolytica were shown to accumulate antisense transcripts and inhibit amoebapore synthesis. In contrast, transfectants with plasmid constructs in which the amoebapore gene was placed under the control of the gLE3 promotor of RP-L21, which is known to be translated, did not accumulate antisense transcript or inhibit gene expression. Maximal inhibition of amoebapore expression was obtained when the antisense construct also included the 5' and 3' untranslated regions of the amoebapore gene. In E. dispar the opposite situation was found, plasmid constructs containing the promotor regions of the gLE3 copy, which were shown to be poorly translated, were more efficient in inhibiting the synthesis of a 30 kDa surface-specific antigen than a construct with the g34 promotor element." @default.
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- W2026006075 date "2000-03-15" @default.
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- W2026006075 title "Inhibition of gene expression in Entamoeba by the transcription of antisense RNA: effect of 5â² and 3â² regulatory elements" @default.
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- W2026006075 doi "https://doi.org/10.1016/s0166-6851(00)00181-x" @default.
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