Abstract
The use of certain organic chemicals has been found to improve yields and specificity in PCR. In this study, we examined the effects of dimethyl sulfoxide (DMSO), formamide, and glycerol on the reverse transcription reaction catalyzed by reverse transcriptases (RTs) from avian myeloblastosis virus (AMV) and Moloney murine leukaemia virus (MMLV). At 42 °C, DMSO at 24% v/v and formamide at 12–14% inhibited the cDNA synthesis reaction, but DMSO at 12% and formamide at 6–8% improved the efficiency of the cDNA synthesis reaction at low temperatures (25–34 °C). Glycerol at 10% improved the efficiency of the cDNA synthesis reaction at high temperatures (49–61 °C). The effects of DMSO and formamide appeared to be accompanied by decreases in the melting temperatures of the primers, and the effect of glycerol was due to increases in the thermal stabilities of AMV RT and MMLV RT.
