Abstract
miRNAs in plant plays crucial role in controlling proper growth, development and fitness by modulating the expression of their target genes. Therefore to modulate the expression of any stress/development related gene specifically, it is better to modulate expression of the miRNA that can target that gene. To modulate the expression level of miRNA, it is prerequisite to uncover the underlying molecular mechanism of its biogenesis. The biogenesis pathway consists of two major steps, transcription of MIR gene to pri-MIRNA and processing of pri-MIRNA into mature miRNA via sequential cleavage steps. Both of these pathways are tightly controlled by several different factors involving structural and functional molecules. This review is mainly focused on different aspects of pri-MIRNA processing mechanism to emphasize on the fact that to modulate the level of a miRNA in the cell only over-expression or knock-down of that MIR gene is not always sufficient rather it is also crucial to take processing regulation into consideration. The data collected from the recent and relevant literatures depicts that processing regulation is controlled by several aspects like structure and size of the pri-MIRNA, presence of introns in MIR gene and their location, interaction of processing factors with the core components of processing machinery etc. These detailed information can be utilized to figure out the particular point which can be utilized to modulate the expression of the miRNA which would ultimately be beneficial for the scientist and researcher working in this field to generate protocol for engineering plant with improved yield and stress tolerance.
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Abbreviations
- miRNA:
-
MicroRNA
- pri-MIRNA :
-
Primary microRNA
- DCL1:
-
Dicer like 1
- RISC:
-
RNA-induced silencing complex
- CBC:
-
cap-binding complex
- SE:
-
Serrate
- HYL1:
-
Hyponastic leaves 1
- DDL:
-
Dawdle
- TGH:
-
TOUGH
- HEN1:
-
HUA ENHANCER1
- HST:
-
HASTY
- AGO1:
-
ARGONAUTE
- hnRNPs:
-
Heterogeneous nuclear ribonucleoproteins
- XCT:
-
XAP5 CIRCADIAN TIMEKEEPER
- RACK1:
-
RECEPTOR FOR ACTIVATED C KINASE 1
- RCF3:
-
REGULATOR OF CBF GENE EXPRESSION 3
- PP4:
-
Protein Phosphatase 4
- MAC:
-
MOS4-Associated Complex
- SIC:
-
SICKLE
- STA1:
-
STABILIZED1
- HOS5:
-
HIGH OSMOTIC STRESS GENE EXPRESSION 5
- DOG1:
-
DELAY OF GERMINATION1
- EMU:
-
ERECTA mRNA UNDER-EXPRESSED
- MTA:
-
MRNA adenosine methylase
- HESO1:
-
HEN1 SUPPRESSOR 1
- SDN1:
-
SMALL-RNA-DEGRADING NUCLEASES
- EMA1:
-
ENHANCED miRNA ACTIVITY1
- TRN1:
-
TRANSPORTIN1
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Jodder, J. Regulation of pri-MIRNA processing: mechanistic insights into the miRNA homeostasis in plant. Plant Cell Rep 40, 783–798 (2021). https://doi.org/10.1007/s00299-020-02660-7
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DOI: https://doi.org/10.1007/s00299-020-02660-7