Figure 2. RNA-directed deposition of epigenetic signals.

(A-C) Sequence-specific recognition models for both sRNAs (depicted) and lncRNAs. (A) Interaction of an sRNA with complementary sequences on a nascent transcriptl. (B) Interaction of an sRNA with ssDNA to form a heteroduplex. (C) Recognition of sequence motifs by sRNA in a closed dsDNA duplex. (D-E) additional recruitment models for lncRNAs. (D) A folded lncRNA recognizes a DNA sequence via complex surface-mediated interactions. (E) A lncRNA acting locally in a co-transcriptional fashion by being anchored to chromatin by RNA PII. RBP, RNA binding protein; A, hypothetical adaptor protein; CMC, chromatin-modifying complex.