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Analysis of human small nucleolar RNAs (snoRNA) and the development of snoRNA modulator of gene expression vectors.

Human small nucleolar RNAs (snoRNAs) that copurify with nucleoli isolated from HeLa cells have been characterized. Novel fibrillarin-associated snoRNAs were detected that allowed the creation of a new vector system for the targeted knockdown of one or more genes in mammalian cells. The snoMEN (snoRNA modulator of gene expressioN) vector technology is based on snoRNA HBII-180C, which contains an internal sequence that can be manipulated to make it complementary to RNA targets. Gene-specific knockdowns are demonstrated for endogenous cellular proteins and for G/YFP-fusion proteins. Multiplex snoMEN vectors coexpress multiple snoRNAs in one transcript, targeted either to different genes or to different sites in the same gene. Protein replacement snoMEN vectors can express a single transcript combining cDNA for a tagged protein with introns containing cognate snoRNAs targeted to knockdown the endogenous cellular protein. We foresee applications for snoMEN vectors in basic gene expression research, target validation, and gene therapy.

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Vectors for co-expression of two genes in Caenorhabditis elegans.

To meet the increasing need of simultaneously co-expressing two different genes in the same cell of transgenic Caenorhabditis elegans, here, we report the establishment of dicistronic vectors that contain an intercistronic region (ICR) of the C. elegans operon, CEOP5428. In these vectors, a green fluorescence protein (GFP) and a red FP (RFP) genes were placed in the first and second cistrons, respectively, which were separated by the ICR. Driven by the fibrillarin (fib-1) or myo-2 promoter, the GFP- and RFP-fusion proteins were consistently co-expressed in the entire worm cells or in the pharynx muscle cells of the transgenic worms, respectively. Our work demonstrates that ICR-containing dicistronic vectors could be developed into versatile co-expression systems in C. elegans for functional analysis of genes of interest.

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