High-temperature, nonradioactive primer extension assay for determination of a transcription-initiation site

Biotechniques. 1998 Jul;25(1):72-4, 76, 78. doi: 10.2144/98251st02.


We have developed a simple and safe method for the determination of a transcription-initiation site. In this method, reverse transcriptase of the avian myeloblastosis virus or rTth DNA polymerase from Thermus thermopilus was used with a fluorescein isothiocyanate (FITC)-labeled primer. The primer-extension reaction can be performed at a high temperature, which reduces the hindering effect of the secondary structure in RNA, and can omit the annealing step between RNA and the primer. Almost all steps can be done in one tube. This procedure can provide reliable and reproducible data when compared with the conventional procedure at low temperature. Moreover, the sequencing ladder that is required for determining the position of extended products can be obtained with the same FITC-labeled primer.

Publication types

  • Technical Report

MeSH terms

  • DNA / chemistry
  • DNA / genetics
  • DNA / metabolism*
  • DNA Primers / chemistry
  • DNA Primers / genetics
  • DNA Primers / metabolism*
  • DNA, Bacterial / chemistry
  • DNA, Bacterial / genetics
  • DNA, Bacterial / metabolism
  • DNA-Directed DNA Polymerase / metabolism
  • Escherichia coli / chemistry
  • Escherichia coli / enzymology
  • Escherichia coli / genetics
  • Fluorescein-5-isothiocyanate
  • Genes, Bacterial / genetics
  • Genetic Techniques
  • Glucokinase / genetics
  • Polymerase Chain Reaction
  • RNA / genetics
  • RNA / metabolism
  • RNA-Directed DNA Polymerase / metabolism
  • Reproducibility of Results
  • Temperature
  • Transcription, Genetic / genetics*


  • DNA Primers
  • DNA, Bacterial
  • RNA
  • DNA
  • Glucokinase
  • RNA-Directed DNA Polymerase
  • DNA-Directed DNA Polymerase
  • Fluorescein-5-isothiocyanate