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Related Concept Videos

Complementary DNA01:44

Complementary DNA

Overview
RACE - Rapid Amplification of cDNA Ends02:35

RACE - Rapid Amplification of cDNA Ends

Rapid Amplification of cDNA Ends, or RACE, is one of the most effective methods to obtain a full-length cDNA from an mRNA sequence between a known internal region to the unknown sequence at the 5’ or 3’ end. The unknown region is cloned in the cDNA by a gene-specific primer that binds the known end, and a hybrid primer that attaches a predefined anchor sequence to the unknown end of the cDNA. The sequence in between is amplified by PCR with an anchor primer and a gene-specific primer.
Since the...

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Related Experiment Video

Updated: Jun 3, 2026

Enrichment of mRNA and Bisulfite-mRNA Library Preparation for Next-Generation Sequencing
06:57

Enrichment of mRNA and Bisulfite-mRNA Library Preparation for Next-Generation Sequencing

Published on: July 7, 2023

Constructing expression cDNA libraries using unphosphorylated adaptors.

K K Stanley1, J Herz, H Haymerle

  • 1European Molecular Biology Laboratory, Heidelberg, Federal Republic of Germany.

Methods in Molecular Biology (Clifton, N.J.)
|March 23, 2011
PubMed
Summary
This summary is machine-generated.

Constructing DNA libraries for molecular biology can be challenging. This study focuses on improving the efficiency of cloning DNA fragments into plasmid vectors, a critical step for screening rare DNA molecules.

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Last Updated: Jun 3, 2026

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Area of Science:

  • Molecular Biology
  • Recombinant DNA Technology

Background:

  • DNA library construction is fundamental in molecular biology but often yields suboptimal results, particularly for novices.
  • Efficient construction of large libraries is crucial for identifying rare DNA molecules.

Purpose of the Study:

  • To address the inefficiencies in cloning DNA fragments into plasmid vectors.
  • To optimize the process of creating cDNA libraries for molecular biology applications.

Main Methods:

  • cDNA synthesis from poly(A)(+) RNA using improved protocols and reverse transcriptase.
  • Insertion of double-stranded cDNA into suitable cloning vehicles (plasmid vectors).
  • Transformation of competent Escherichia coli strains with chimeric vector/cDNA molecules.

Main Results:

  • Modern cDNA synthesis yields approximately 50% double-stranded cDNA from poly(A)(+) RNA.
  • Highly competent Escherichia coli strains can achieve transformation efficiencies exceeding 10(8) transformants/µg of supercoiled DNA.
  • Direct cloning methods (blunt-end or linker-based ligation) into plasmid vectors often decrease cloning efficiency due to vector recircularization issues, necessitating alkaline phosphatase treatment.

Conclusions:

  • Despite advancements in cDNA synthesis and bacterial transformation, the DNA fragment cloning step remains a bottleneck.
  • Optimizing ligation strategies and vector preparation is essential to maximize the efficiency of DNA library construction.