title: Comparison of synthetic DNA templates with authentic cDNA templates in terms of quantification by real-time quantitative reverse transcription polymerase chain reaction.
abstract: 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 degrees 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.
authors.affiliation: Department of Hospital Pharmacy, School of Medicine, Kobe University, Japan.
authors.forename: Yuka
authors.initials: Y
authors.lastname: Moriya
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nakamura
authors.forename: Noboru
authors.initials: N
authors.lastname: Okamura
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Sakaeda
authors.forename: Masanori
authors.initials: M
authors.lastname: Horinouchi
authors.forename: Takao
authors.initials: T
authors.lastname: Tamura
authors.forename: Nobuo
authors.initials: N
authors.lastname: Aoyama
authors.forename: Masato
authors.initials: M
authors.lastname: Kasuga
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Okumura
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D018938:Caco-2 Cells; D015925:Cryopreservation; D004247:DNA / Q000138:chemical synthesis* / Q000737:chemistry*; D018076:DNA, Complementary / Q000737:chemistry*; D004273:DNA, Neoplasm / Q000737:chemistry; D003627:Data Interpretation, Statistical; D004386:Duodenum / Q000737:chemistry; D005615:Freezing; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D008297:Male; D009841:Oligonucleotides / Q000138:chemical synthesis / Q000737:chemistry; D015203:Reproducibility of Results; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013698:Templates, Genetic
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018076:DNA, Complementary; D004273:DNA, Neoplasm; D009841:Oligonucleotides; D004247:DNA; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases