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Interplay and transition between small RNA-directed posttranscriptional and transcriptional gene silencing in plants

Interplay and transition between small RNA-directed posttranscriptional and transcriptional gene... RNA silencing refers to small RNA (sRNA)-directed, sequence-specific regulatory mechanisms operating in diverse eukaryotic organisms. Plants possess several genetically distinct sRNA-directed regulatory pathways that are known to operate either posttranscriptionally or transcriptionally. Over the years, the sRNA-directed posttranscriptional gene silencing (PTGS) and sRNA-directed DNA methylation (RdDM), which can lead to epigenetic transcriptional gene silencing (TGS), were considered distinct pathways with little or no interactions. Recent studies have uncovered an expression-dependent pathway termed RDR6-RdDM which involves the nuclear RNA polymerase II (Pol II), RNA-dependent RNA polymerase 6 (RDR6), and Pol V, but not Pol IV and RDR2, key components of the canonical Pol IV-, RDR2-, and DCL3-dependent RdDM (Pol IV-RdDM). The RDR6-RdDM pathway provides a mechanistic link between sRNA-directed PTGS and TGS, revealing previously unappreciated dynamic features of sRNA-directed regulation in plants. This 21- and 22-nucleotide (nt) sRNA-directed RdDM may represent a general transition step during de novo establishment of TGS through the canonical Pol IV-RdDM in plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Indian Journal of Plant Physiology Springer Journals

Interplay and transition between small RNA-directed posttranscriptional and transcriptional gene silencing in plants

Indian Journal of Plant Physiology , Volume 22 (4) – Dec 22, 2017

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References (199)

Publisher
Springer Journals
Copyright
Copyright © 2017 by Indian Society for Plant Physiology
Subject
Life Sciences; Plant Sciences; Plant Physiology; Plant Ecology; Plant Biochemistry; Cell Biology; Plant Genetics and Genomics
ISSN
0019-5502
eISSN
0974-0252
DOI
10.1007/s40502-017-0337-5
Publisher site
See Article on Publisher Site

Abstract

RNA silencing refers to small RNA (sRNA)-directed, sequence-specific regulatory mechanisms operating in diverse eukaryotic organisms. Plants possess several genetically distinct sRNA-directed regulatory pathways that are known to operate either posttranscriptionally or transcriptionally. Over the years, the sRNA-directed posttranscriptional gene silencing (PTGS) and sRNA-directed DNA methylation (RdDM), which can lead to epigenetic transcriptional gene silencing (TGS), were considered distinct pathways with little or no interactions. Recent studies have uncovered an expression-dependent pathway termed RDR6-RdDM which involves the nuclear RNA polymerase II (Pol II), RNA-dependent RNA polymerase 6 (RDR6), and Pol V, but not Pol IV and RDR2, key components of the canonical Pol IV-, RDR2-, and DCL3-dependent RdDM (Pol IV-RdDM). The RDR6-RdDM pathway provides a mechanistic link between sRNA-directed PTGS and TGS, revealing previously unappreciated dynamic features of sRNA-directed regulation in plants. This 21- and 22-nucleotide (nt) sRNA-directed RdDM may represent a general transition step during de novo establishment of TGS through the canonical Pol IV-RdDM in plants.

Journal

Indian Journal of Plant PhysiologySpringer Journals

Published: Dec 22, 2017

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