Abstract
Advances in transcriptomics have led to the classification of small RNAs (sRNAs) into mainly three categories: miRNAs, siRNAs and piRNAs. However, there are many new types of sRNAs under exploration. Though such sRNAs differ from one another, they collaborate in their mode of action. Among the sRNAs, microRNAs (miRNAs) widely captured the attention of molecular biologists. miRNAs are short, endogenously expressed and non-translated RNAs. Mature plant miRNAs are in general smaller in size (~22 bp) and considered as negative gene regulatory molecules. In general plant miRNAs have the following features: (a) They are coded by miRNA genes with unknown length and are sequentially cleaved from pri-miRNA and pre-miRNA into a short mature miRNA by Dicer -like 1 (dcl1) and several other enzymes. (b) All pre-miRNAs can form a stem-looped hairpin secondary structure with the mature miRNA on one arm and the complementary sequence, termed miRNA*, on the another arm with high negative minimum folding free energy (MFE) and MFE index (MFEI). (c) Typically, miRNAs do negatively regulate target gene expression and the miRNA* sequence is degraded by an unknown mechanism. However, in some cases, the miRNA* sequence also can function to target a specific gene. Over the past few years, microarray technologies, large-scale small RNA and whole genome sequencing projects and data mining have provided a wealth of information about the spectrum of plant miRNAs and their targets. Hitherto identified miRNAs in plant kingdom have shown that they are deeply conserved; nevertheless considerable numbers of species-specific miRNAs also exist. Evidences are gradually mounting to notify that miRNAs have key roles in developmental timing, cell proliferation and cell death, organogenesis, patterning of tissues/organ and more importantly, in response to external environmental stimuli. Thus it is very obvious that plant miRNAs are more numerous and their regulatory impact is more pervasive than was previously suspected.
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Acknowledgement
I wish to thank DBT, India and BMZ-GIZ, Germany, for funding which helped in setting up pilot studies in miRNA. I sincerely apologise to colleagues whose work I could not cite because of space limitations.
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Boopathi, N.M. (2015). Plant miRNomics: Novel Insights in Gene Expression and Regulation. In: Barh, D., Khan, M., Davies, E. (eds) PlantOmics: The Omics of Plant Science. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2172-2_7
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