alexa A species of small antisense RNA in posttranscriptional gene silencing in plants.
Microbiology

Microbiology

Journal of Antivirals & Antiretrovirals

Author(s): Hamilton AJ, Baulcombe DC

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Abstract Posttranscriptional gene silencing (PTGS) is a nucleotide sequence-specific defense mechanism that can target both cellular and viral mRNAs. Here, three types of transgene-induced PTGS and one example of virus-induced PTGS were analyzed in plants. In each case, antisense RNA complementary to the targeted mRNA was detected. These RNA molecules were of a uniform length, estimated at 25 nucleotides, and their accumulation required either transgene sense transcription or RNA virus replication. Thus, the 25-nucleotide antisense RNA is likely synthesized from an RNA template and may represent the specificity determinant of PTGS.
This article was published in Science and referenced in Journal of Antivirals & Antiretrovirals

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