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. 1996 Apr 30;93(9):4370–4373. doi: 10.1073/pnas.93.9.4370

Amplification of the full-length hepatitis A virus genome by long reverse transcription-PCR and transcription of infectious RNA directly from the amplicon.

R Tellier 1, J Bukh 1, S U Emerson 1, R H Purcell 1
PMCID: PMC39544  PMID: 8633073

Abstract

The genetic study of RNA viruses is greatly facilitated by the availability of infectious cDNA clones. However, their construction has often been difficult. While exploring ways to simplify the construction of infectious clones, we have successfully modified and applied the newly described technique of "long PCR" to the synthesis of a full-length DNA amplicon from the RNA of a cytopathogenic mutant (HM 175/24a) of the hepatitis A virus (HAV). Primers were synthesized to match the two extremities of the HAV genome. The antisense primer, homologous to the 3' end, was used in both the reverse transcription (RT) and the PCR steps. With these primers we reproducibly obtained a full-length amplicon of approximately 7.5 kb. Further, since we engineered a T7 promoter in the sense primer, RNA could be transcribed directly from the amplicon with T7 RNA polymerase. Following transfection of cultured fetal rhesus kidney cells with the transcription mixture containing both the HAV cDNA and the transcribed RNA, replicating HAV was detected by immunofluorescence microscopy and, following passage to other cell cultures, by focus formation. The recovered virus displayed the cytopathic effect and large plaque phenotype typical of the original virus; this result highlights the fidelity of the modified long reverse transcription-PCR procedure and demonstrates the potential of this method for providing cDNAs of viral genomes and simplifying the construction of infectious clones.

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Selected References

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