What are the steps involved in cDNA synthesis?

Steps in cDNA synthesis:

  1. mRNA isolation:
  2. mRNA purification:
  3. Selection of enzyme- reverse transcriptase.
  4. Reverse transcriptase PCR:
  5. Construction of library:
  6. Linker ligation and sticky end generation:
  7. Preparing recombinant plasmid vector:
  8. Transforming recombinant plasmid into host cell:

What is the purpose of using random primer in cDNA synthesis?

Random Primers are oligodeoxyribonucleotides (mostly hexamers) used to prepare labeled DNA probes from templates for filter hybridization or in situ hybridization and to prime mRNAs with or without poly(A) for cDNA synthesis.

What is the purpose of the primer in a RT reaction?

Primer selection. To initiate reverse transcription, reverse transcriptases require a short DNA oligonucleotide called a primer to bind to its complementary sequences on the RNA template and serve as a starting point for synthesis of a new strand.

What is gene-specific primer?

Gene-specific primers are ready-to-use components of PCR and qPCR that enable the detection of specific genes. Eliminating the need for manual primer-design, these commercially prepared oligonucleotides can speed up molecular experiments. These usually come in primer pairs, containing forward and reverse sequences.

How many primers are used in the process of reverse transcriptase amplification?

two PCR primers
RT-PCR amplification of a particular RNA sequence requires two PCR primers that are specific for the gene transcript of interest. The primer design should allow differentiation between the amplified product from cDNA and an amplified product derived from contaminating genomic DNA.

What other types of primers could be used for cDNA synthesis how these primers used in the cDNA synthesis?

There are three types of primers used to initiate reverse transcription depending on the RNA template and the downstream application (oligo(dT) primers, random primers, and gene-specific primers).

Do you need primers for cDNA synthesis?

First-strand synthesis of cDNA utilizes either oligo(dT), random primers, or a combination of these strategies to prime the reverse transcription reaction. Priming a reaction with oligo(dT) initiates the synthesis preferentially at the 3′ end of the RNA fragment.

How are primers synthesized?

A primer must be synthesized by an enzyme called primase, which is a type of RNA polymerase, before DNA replication can occur. The synthesis of a primer is necessary because the enzymes that synthesize DNA, which are called DNA polymerases, can only attach new DNA nucleotides to an existing strand of nucleotides.

How do you determine primer specificity?


  1. Go to the Primer BLAST submission form.
  2. Enter one or both primer sequences in the Primer Parameters section of the form.
  3. In the Primer Pair Specificity Checking Parameters section, select the appropriate source Organism and the smallest Database that is likely to contain the target sequence.

How do you create a gene specific primer?

Taking into consideration the information above, primers should generally have the following properties:

  1. Length of 18-24 bases.
  2. 40-60% G/C content.
  3. Start and end with 1-2 G/C pairs.
  4. Melting temperature (Tm) of 50-60°C.
  5. Primer pairs should have a Tm within 5°C of each other.
  6. Primer pairs should not have complementary regions.

What other types of primers could be used for cDNA synthesis?

What is the process of binding of primer to the denatured strand called?

9. What is the process of binding of primer to the denatured strand called? Sol:(a) Annealing.

How is cDNA synthesized from RNA?

cDNA Synthesis. cDNA Synthesis describes the generation of complementary DNA (cDNA) from an RNA template by reverse transcription. Reverse transcriptases (RTs) use an RNA template and a primer complementary to the RNA to direct the synthesis of the first strand cDNA, which can be used directly as a template for the Polymerase Chain Reaction (PCR).

Why combine random primers and oligo (dT) for cDNA synthesis?

Combining random primers and oligo (dT) overcomes the disadvantages of each priming mechanism as it takes advantage of priming from the 3’ end for fuller length cDNA transcripts and random priming for complete RNA coverage without a 3’ to 5’ bias. Bio-Rad’s High-Fidelity cDNA Synthesis Kits

What is the difference between sequence-specific and random primers in cDNA synthesis?

cDNA synthesis using sequence-specific primers gives the highest specificity. However, a cDNA synthesis reaction generated by specific primers cannot be used for other products. Sequence-specific primers can be used for one-step cDNA synthesis, whereas oligo (dT) and random primers are used in two-step RT-PCR.

What are the best primers to use for cDNA synthesis?

The best advice, if you are looking at mRNA in PCR, is to use a mixture (50:50 split) of both random hexamers and oligo (dT) primers during cDNA synthesis. Steven is the founder of Top Tip Bio.