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Adaptor ligation-based polymerase chain reaction-mediated walking

L S Padegimas1, N A Reichert

  • 1Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, Mississippi 39762, USA.

Analytical Biochemistry
|July 11, 1998
PubMed
Summary

Researchers enhanced adaptor ligation PCR for isolating unknown DNA sequences. This improved method increases specificity and successfully identified novel maize gene promoter regions and a dehydrogenase gene sequence.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Plant Science

Background:

  • Adaptor ligation PCR is a technique for DNA sequence walking.
  • Existing methods can lack specificity, limiting the isolation of unknown flanking sequences.

Purpose of the Study:

  • To develop an improved adaptor ligation PCR method for enhanced specificity.
  • To isolate novel promoter regions and gene sequences from Zea mays (maize).

Main Methods:

  • Utilized uniquely blocked adaptors in PCR.
  • Employed exonuclease III digestion to remove unligated genomic DNA.
  • Applied the improved technique to Zea mays genomic DNA.

Main Results:

  • Achieved significantly enhanced specificity in adaptor ligation-based walking.

Related Experiment Videos

  • Successfully isolated three novel promoter regions from maize peroxidase genes.
  • Identified and confirmed sequences encoding a putative maize 6-phosphogluconate dehydrogenase gene.

    • Conclusions:

    • The improved adaptor ligation PCR method offers enhanced specificity for DNA walking.
    • This technique is effective for isolating novel regulatory elements and gene sequences in plants.
    • The method's improvements are applicable to other adaptor ligation-based PCR techniques.