T7-based Linear Amplification
T7-based Linear Amplification - Related Videos
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Generation of GFP-Tagged Recombinant Respiratory Syncytial Virus Using a T7 Expression System
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Rapid Amplification of cDNA Ends
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Source: Pablo Sanchez Bosch2, Sean Corcoran2 and Katja Brückner1,2,3 1Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research 2Department of Cell and Tissue Biology, 3Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, USA Rapid Amplification of cDNA Ends (RACE) is a technique that allows amplification of full-length cDNA from mRNA by extending to the 3’ or 5’ end, even without prior knowledge of the sequence (Frohman et al.,...
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Rapid, Enzymatic Methods for Amplification of Minimal, Linear Templates for Protein Prototyping using Cell-Free Systems
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The study describes a protocol for creating large (µg-mg) quantities of DNA for protein screening campaigns from synthetic gene fragments without cloning or using living cells. The minimal template is enzymatically digested and circularized and then amplified using isothermal rolling circle amplification. Cell-free expression reactions could be performed with the unpurified product.
FAQs
The method generates multiple RNA copies from each complementary DNA template through transcription, rather than relying on an exponential copying process. Because amplification remains linked to the representation of the starting templates, the resulting RNA can more closely reflect the relative composition of the original sample. This feature supports comparative gene expression analysis when input RNA is scarce.
The T7 promoter provides the recognition site required for T7 RNA polymerase to transcribe the complementary DNA template. Incorporating this promoter converts the cDNA into a template suitable for in vitro RNA production. Without that promoter sequence, the polymerase would not have the defined starting point needed to generate the amplified antisense RNA product.
T7 RNA polymerase performs the in vitro transcription step that produces multiple antisense RNA copies from each promoter-containing complementary DNA template. This separates the amplification stage from cellular transcription and supplies RNA for later analytical workflows. The amount of RNA generated can therefore extend experiments beyond what the original biological sample could directly provide.
T7-based Linear Amplification uses transcription from cDNA templates and is intended to preserve a more proportional relationship between the starting sample and the amplified material. Exponential amplification, by contrast, increases products through repeated copying, which represents a different amplification principle. This distinction makes the linear approach useful when preserving sample representation is important for expression profiling.
A typical workflow begins with the limited RNA-containing biological sample and proceeds through complementary DNA preparation. A T7 promoter is incorporated into the cDNA, which then serves as the template for in vitro transcription by T7 RNA polymerase. The resulting amplified antisense RNA is collected for downstream analyses such as gene expression profiling or microarray studies.
The approach is particularly valuable when the available specimen contains limited RNA. Examples identified for this application include clinical specimens, sorted cells, and early developmental tissues. In these settings, direct analysis may not provide enough material, whereas amplification can make the sample suitable for broader gene expression investigations without requiring a substantially larger starting specimen.
Amplified RNA can support gene expression profiling, microarray analysis, and related investigations of transcriptional changes. These applications allow researchers to examine patterns of RNA abundance when the original sample is small. In biology studies, the method therefore helps extend expression-based experiments to constrained specimens and supports analysis of transcriptional states across different sample types.