Rna Transcript Synthesis
Rna Transcript Synthesis - Related Videos
02:36
Transfer RNA Synthesis
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2020
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases. Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
02:53
Ribosomal RNA Synthesis
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2020
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells. Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
02:36
Bacteriophage Synthesis Using a Cell-Free Transcription-Translation System
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2026
Source: Rustad, M., et al. Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System. J. Vis. Exp. (2017).This video demonstrates the synthesis of bacteriophages using a cell-free transcription–translation (TXTL) system. A master mix is prepared using a bacterial crude extract, an energy mix, an amino acid mix, an inhibitor for a DNA-degrading enzyme, and bacteriophage DNA, then incubated. The in vitro molecular machinery enables viral protein expression and DNA...
08:55
In vitro Transcription and Capping of Gaussia Luciferase mRNA Followed by HeLa Cell Transfection
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Cited by 13 •
2012
This method describes high yield in vitro synthesis of both capped and uncapped mRNA from a linearized plasmid containing the Gaussia luciferase (GLuc) gene. The RNA is purified and a fraction of the uncapped RNA is enzymatically capped using the Vaccinia virus capping enzyme. In the final step, the mRNA is transfected into HeLa cells and cell culture supernatants are assayed for luciferase activity.
09:35
Using Click Chemistry to Measure the Effect of Viral Infection on Host-Cell RNA Synthesis
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Cited by 15 •
2013
This method describes the use of click chemistry to measure changes in host cell transcription after infection with the Rift Valley fever virus (RVFV) strain MP-12. Results can be visualized qualitatively via fluorescence microscopy or obtained quantitatively through flow cytometry. This method is adaptable for use with other viruses.
FAQs
Promoter recognition determines where transcription begins and connects a DNA region with the RNA molecule produced from it. RNA polymerase binds this regulatory starting site, opens a local section of DNA, and incorporates complementary ribonucleotides while reading the template strand. Consequently, promoter-associated regulation can influence which genes contribute transcripts to cellular activity.
The template strand supplies the sequence information used to assemble the RNA transcript. As RNA polymerase reads that DNA strand, it joins complementary ribonucleotides, allowing the resulting RNA to reflect encoded information rather than being copied arbitrarily. This complementarity is central to producing transcripts that can participate in gene expression.
Termination releases the newly completed transcript from the transcription process, establishing an endpoint for RNA production. The released molecule may then undergo processing before it functions. Considering both stages is important because the initial transcript and the processed RNA are not necessarily equivalent experimental materials, especially when researchers analyze gene expression or prepare RNA for downstream use.
The process produces messenger, ribosomal, and transfer RNAs, giving cells multiple transcript classes associated with gene expression. These categories represent different RNA outputs rather than interchangeable products. Identifying which class is being generated helps researchers interpret transcriptional activity and relate changes in RNA production to broader biological processes.
Laboratory-based synthesis supports several research activities, including gene expression analysis and preparation of RNA probes. It also enables production of research or therapeutic RNA outside the immediate cellular setting. These applications allow investigators to generate RNA for examining biological activity, detecting relevant nucleic acid sequences, or developing experimental materials connected with gene expression studies.
Because transcript production reflects gene activity, examining RNA synthesis can reveal how regulation changes across biological conditions. Researchers can apply this perspective to developmental studies and to investigations of disease-related changes in gene activity. Comparing transcript outputs therefore provides context for understanding when genes are active and how altered activity may relate to biological outcomes.