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Recent Insights into Plant miRNA Biogenesis: Multiple Layers of miRNA Level Regulation.

Mateusz BajczykArtur JarmolowskiMonika JozwiakAndrzej M PacakHalina PietrykowskaIzabela SierockaAleksandra Świda-BarteczkaLukasz SzewcZofia Szweykowska-Kulinska
Published in: Plants (Basel, Switzerland) (2023)
MicroRNAs are small RNAs, 20-22 nt long, the main role of which is to downregulate gene expression at the level of mRNAs. MiRNAs are fundamental regulators of plant growth and development in response to internal signals as well as in response to abiotic and biotic factors. Therefore, the deficiency or excess of individual miRNAs is detrimental to particular aspects of a plant's life. In consequence, the miRNA levels must be appropriately adjusted. To obtain proper expression of each miRNA, their biogenesis is controlled at multiple regulatory layers. Here, we addressed processes discovered to influence miRNA steady-state levels, such as MIR transcription, co-transcriptional pri-miRNA processing (including splicing, polyadenylation, microprocessor assembly and activity) and miRNA-encoded peptides synthesis. MiRNA stability, RISC formation and miRNA export out of the nucleus and out of the plant cell also define the levels of miRNAs in various plant tissues. Moreover, we show the evolutionary conservation of miRNA biogenesis core proteins across the plant kingdom.
Keyphrases
  • gene expression
  • transcription factor
  • cell proliferation
  • dna methylation
  • poor prognosis
  • stem cells
  • single cell
  • mesenchymal stem cells
  • cell wall
  • heat stress