Figure 1.

Long noncoding RNAs modulate the plant transcriptional machinery

(a). The lncRNA ELENA1 recruits the Mediator complex to the PR1 gene promoter region. The Med19a subunit of Mediator directly interacts with ELENA1, activating PR1 transcription in response to ELF18.(b). The lncRNA SVALKA locus is subjected to transcriptional Pol II read-through in response to prolonged exposure to cold, triggering the transcription of the exosome-sensitive lncRNA asCBF1 upon poly-A site cleavage of SVALKA. asCBF1 transcription causes Pol II head-to-head collision with the CBF1 locus, giving place to a stalled CBF1 mRNA.