Comparison of Synthetic DNA Templates with Authentic cDNA Templates in Terms of Quantification by Real-Time Quantitative Reverse Transcription Polymerase Chain Reaction

  • Moriya Yuka
    Department of Hospital Pharmacy, School of Medicine, Kobe University
  • Nakamura Tsutomu
    Department of Hospital Pharmacy, School of Medicine, Kobe University
  • Okamura Noboru
    Department of Clinical Evaluation of Pharmacotherapy, Kobe University Graduate School of Medicine
  • Sakaeda Toshiyuki
    Department of Hospital Pharmacy, School of Medicine, Kobe University
  • Horinouchi Masanori
    Department of Hospital Pharmacy, School of Medicine, Kobe University
  • Tamura Takao
    Division of Diabetes, Digestive and Kidney Diseases, Department of Clinical Molecular Medicine, Kobe University Graduate School of Medicine
  • Aoyama Nobuo
    Department of Endoscopy, School of Medicine, Kobe University
  • Kasuga Masato
    Division of Diabetes, Digestive and Kidney Diseases, Department of Clinical Molecular Medicine, Kobe University Graduate School of Medicine
  • Okumura Katsuhiko
    Department of Hospital Pharmacy, School of Medicine, Kobe University Department of Clinical Evaluation of Pharmacotherapy, Kobe University Graduate School of Medicine

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Synthetic DNA templates were compared with authentic cDNA templates as standards for the real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR). The single-stranded DNA template used here targeted the multidrug resistant transporter P-glycoprotein/MDR1. The double-stranded DNA template, targeting glyceraldehyde-3-phosphate dehydrogenase (GAPDH), was synthesized using an exonuclease-free large fragment E. coli DNA polymerase I. The human colon carcinoma cell line Caco-2 and human duodenum biopsies were used to prepare the authentic cDNA templates. The standard lines were comparable for the synthetic DNA templates and authentic cDNA templates. Long-term cryopreservation at −80 °C resulted in the destabilization of the synthetic single-stranded DNA template compared with the authentic cDNA templates in the case of MDR1, whereas for GAPDH, the stability of the synthetic double-stranded DNA template was comparable with that of the authentic cDNA templates. Even for the synthetic DNA templates, repetitive freeze-thawing resulted in destabilization, especially at lower concentrations, and degradation products might have interfered with the RT-PCR's efficiency. The synthetic DNA templates are better than the authentic cDNA templates, but more than 5 cycles of repetitive freeze-thawing should be avoided.

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