siRNAs from miRNA sites mediate DNA methylation of target genes
Open accessAbstract
Arabidopsis microRNA (miRNA) genes (MIR) give rise to 20- to 22-nt miRNAs that are generated predominantly by the type III endoribonuclease Dicer-like 1 (DCL1) but do not require any RNA-dependent RNA Polymerases (RDRs) or RNA Polymerase IV (Pol IV). Here, we identify a novel class of non-conserved MIR genes that give rise to two small RNA species, a 20- to 22-nt species and a 23- to 27-nt species, at the same site. Genetic analysis using small RNA pathway mutants reveals that the 20- to 22-nt small RNAs are typical miRNAs generated by DCL1 and are associated with Argonaute 1 (AGO1). In contrast, the accumulation of the 23- to 27-nt small RNAs from the miRNA-generating sites is dependent on DCL3, RDR2 and Pol IV, components of the typical heterochromatic small interfering RNA (hc-siRNA) pathway. We further demonstrate that these MIR-derived siRNAs associate with AGO4 and direct DNA methylation at some of their target loci in trans. In addition, we find that at the miRNA-generating sites, some conserved canonical MIR genes also produce siRNAs, which also induce DNA methylation at some of their target sites. Our systematic examination of published small RNA deep sequencing datasets of rice and moss suggests that this type of dual functional MIRs exist broadly in plants.
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In Arabidopsis thaliana, microRNAs and small interfering RNAs are essential regulators of plant development, guide DNA methylation, and act as transcriptional repressors.
“As proven in the model species Arabidopsis thaliana, microRNAs (miRNA) and small interfering RNAs (siRNA) are essential regulators of plant development, guide DNA methylation in plants (especially de novo methylation), and act as transcriptional repressors [127,128].”
From Somaclonal Variation—Advantage or Disadvantage in Micropropagation of the Medicinal Plants (2023) · cites this paper as [128]
The Discussion (page unavailable) reports that Arabidopsis MIR-derived siRNAs direct de novo DNA methylation and regulate gene expression at the transcriptional level. It distinguishes these from typical miRNAs, which act mainly through post-transcriptional repression. The cited passages do not establish that both RNA classes are essential regulators of plant development. (LLM, conf=0.87)
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Cited by
Sorted by citations
Somaclonal Variation—Advantage or Disadvantage in Micropropagation of the Medicinal Plants
Duta-Cornescu, G., Constantin, N., Pojoga, D.-M., Nicuta, D., & Simon-Gruita, A. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms24010838 · Cited by 108 · see citing works
Noncoding RNA-Mediated Regulation of DNA Methylation: Insights into Plant Epigenetic Mechanisms
Ali, S., & Tang, Y. (2025) · Journal of Plant Growth Regulation · doi:10.1007/s00344-024-11462-0 · Cited by 24 · see citing works
- Authors
- Chellappan, P., Xia, J., Zhou, X., Gao, S., Zhang, X., Coutino, G., Vazquez, F., Zhang, W., & Jin, H.
- Affiliations
- University of California, Riverside (US)
- Corresponding author
- Zhang, Weixiong
- Jin, Hailing
- Venue
- Nucleic Acids Research
- Publisher
- Oxford University Press (OUP)
- Published
- 2010-07-09
- Volume
- 38
- Issue
- 20
- Pages
- 6883-6894
- ISSN
- 0305-1048 (ISSN-L)
- 1362-4962
- PMC
- PMC2978365
- OpenAlex
- W2166884499
- Cited by
- 176
- References
- 0
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 6 · 2023: 4 · 2022: 9 · 2021: 12 · 2020: 8 · 2019: 9 · 2018: 5 · 2017: 13 · 2016: 12 · 2015: 11 · 2014: 11 · 2013: 20 · 2012: 23
- FWCI
- 26.56
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Nucleic Acids Research (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- edoc (University of Basel) (acceptedVersion)
- Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, other-oa)
- reroDoc Digital Library (submittedVersion)
- Digital Commons@Becker (Washington University School of Medicine) (submittedVersion, cc-by-nc)
- HighWire Press Open Archive (submittedVersion)
- Zurich Open Repository and Archive (University of Zurich) (submittedVersion, other-oa)
- Zurich Open Repository and Archive (University of Zurich)
- Funders
- National Science Foundation (PPA-7517H, 0743797, 0642843)
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (126329)
- National Institute of General Medical Sciences (R01GM093008)
- National Institute of Allergy and Infectious Diseases (U54AI057160)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (RC1AR058681)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
- Keywords
- microRNA, siRNA, DNA methylation, Arabidopsis thaliana, DCL1, RNA polymerase IV, AGO1, small RNA biogenesis, rice, bryophytes
- MeSH terms
- Oryza, Genes, Plant, Arabidopsis, DNA Methylation, Arabidopsis Proteins, RNA, Small Interfering, MicroRNAs, Bryophyta, Genetic Loci, Argonaute Proteins
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