Coronavirus leader‐RNA‐primed transcription: An alternative mechanism to RNA splicing

Bioessays 5 (6):257-260 (1986)
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Abstract

Many viral and cellular mRNA species contain a leader sequence derived from a distant upstream site on the same gene by a process of RNA splicing. This process usually involves either nuclear functions or self‐splicing of RNA molecules. Coronavirus, a cytoplasmic RNA virus, unfolds yet another mechanism of joining RNA, which involves the use of a free leader RNA molecule. This molecule is synthesized and dissociates from the template RNA, and subsequently reassociates with the template RNA at down‐stream initiation sites of subgenomic mRNAs to serve as the primer for transcription. This leader‐primed transcriptional process thus generates viral mRNAs with a fused leader sequence. A similar mechanism might also operate in the mRNA transcription of African trypanosomes.

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