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Non-viral heterogeneous sequences at the 5' ends of tomato spotted wilt virus mRNAs

Department of Virology, Binnenhaven 11, 6709 PD Wageningen, The Netherlands

Subgenomic messenger RNAs transcribed from the tomato spotted wilt virus (TSWV) S RNA segment were partially purified from total RNA extracts of TSWV-infected Nicotiana rustica and analysed by primer extension analysis. The data obtained show the presence of non-viral sequences, 12 to 20 nucleotides in length, at the 5' ends of the N and NS_s mRNAs, indicating a cap-snatching mechanism for the initiation of transcription. This is the first report of a plant virus using such a mechanism for transcription of the viral genome.

Received 5 March 1992; accepted 16 April 1993.

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