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#15656944 2004/11/05 To Up
The inhibitory effect of pentobarbitone on reverse transcription-PCR.
Pentobarbitone sodium (Sodium 5-ethyl-5[1-methylbutyl]-pentobarbitone) is a short-acting barbiturate that is commonly used to euthanase animals. As part of our studies into the molecular genetics of copper toxicosis in Bedlington terrier dogs, reverse-transcription (RT)-PCR was noted to always fail on RNA samples collected from livers of dogs sacrificed by pentobarbitone injection. When samples were collected without pentobarbitone, however, RT-PCR was always successful. We suspected the possible inhibition by pentobarbitone sodium of either reverse transcriptase or Taq polymerase. In vitro studies showed that pentobarbitone interference of PCR occurred at >4 microg/microl. To identify if pentobarbitone produced competitive inhibition, each components (Taq polymerase, MgCl(2), dNTP, etc.) of the PCR was individually altered. However, inhibition still persisted, suggesting that multiple PCR components may be affected. Also it was shown that pentobarbitone interference was not dependent on the PCR product size. Simple dilution of pentobarbitone contaminated DNA solutions, and the addition of bovine serum albumin (BSA) to the PCR mix overcame pentobarbitone interference. In vivo, PCR by pentobarbitone was found to be compounded by high DNA concentration and pentobarbitone contamination. In addition, both high DNA concentration and pentobarbitone contamination could be overcome through dilution and the addition of BSA. Further work is required to quantify pentobarbitone concentration in the liver-extracted DNA and RNA samples before this inhibition effect on PCR can be fully elucidated.Changbaig Hyun, Lucio John Filippich, Ian Hughes
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