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3' mRNA-seq is a quantitative, genome-wide transcriptomic technique based on the barcoding of the 3' untranslated region (UTR) of mRNA molecules. Unlike standard bulk RNA-seq, where short sequencing reads are generated along the entire length of mRNA transcripts, only the 3' end of polyadenylated RNAs are sequenced in 3' mRNA-seq.
When sequencing RNA other than mRNA, the library preparation is modified. The cellular RNA is selected based on the desired size range. For small RNA targets, such as miRNA, the RNA is isolated through size selection. This can be performed with a size exclusion gel, through size selection magnetic beads, or with a commercially developed kit.
To select mRNA, the RT is performed with a single-stranded sequence of deoxythymine (oligo dT) primer which bind specifically the poly(A) tail of mRNA molecules. Subsequently, the amplified cDNA library is used for sequencing. [64] So, the first step of the method is the single cell encapsulation and library preparation.
Illumina Introduces TruSeq® Stranded mRNA and Total RNA Sequencing Sample Preparation Solutions Delivers Superior Data Quality for Challenging Samples, Unprecedented View of the Transcriptome SAN ...
A genomic library is a set of clones that together represents the entire genome of a given organism. The number of clones that constitute a genomic library depends on (1) the size of the genome in question and (2) the insert size tolerated by the particular cloning vector system. For most practical purposes, the tissue source of the genomic DNA ...
A cDNA library is a combination of cloned cDNA (complementary DNA) fragments inserted into a collection of host cells, which constitute some portion of the transcriptome of the organism and are stored as a "library". cDNA is produced from fully transcribed mRNA found in the nucleus and therefore contains only the expressed genes of an organism.
The T7 promoter region allows large-scale in vitro T7 transcription to transcribe the DNA library into an mRNA library, which provides templates for the in vitro translation reaction later. The ribosomal binding site in the 5’-untranslated region (5’ UTR) is designed according to the in vitro translation system to be used.
The primary transcripts designated to be mRNAs are modified in preparation for translation. For example, a precursor mRNA (pre-mRNA) is a type of primary transcript that becomes a messenger RNA (mRNA) after processing. Pre-mRNA is synthesized from a DNA template in the cell nucleus by transcription. Pre-mRNA comprises the bulk of heterogeneous ...