A large data array on plant gene expression accumulated thanks to comparative omic studies directs the efforts of researchers to the specific or fine effects of the target gene functions and, as a consequence, elaboration of relatively simple and concurrently effective approaches allowing for the insight into the physiological role of gene products. Numerous studies have convincingly demonstrated the efficacy of transient expression strategy for characterization of the plant gene functions. The review goals are (i) to consider the advantages and limitations of different plant systems and methods of transient expression used to find out the role of gene products; (ii) to summarize the current data on the use of the transient expression approaches for the insight into fine mechanisms underlying the gene function; and (iii) to outline the accomplishments in efficient transient expression of plant genes. In general, the review discusses the main and critical steps in each of the methods of transient gene expression in plants; areas of their application; main results obtained using plant objects; their contribution to our knowledge about the fine mechanisms of the plant gene functions underlying plant growth and development; and clarification of the mechanisms regulating complex metabolic pathways.
The polysome profiling method was used to separate mRNAs depending on their loading by ribosomes into polysomal and monosomal fractions. Pools separation of such mRNAs and analysis of transcripts (mRNAs) which are associated with each mRNA pool due to RNA sequencing allowed to get an idea of the translational efficiency of individual mRNAs. Moreover, subsequent in silico analysis make possible searching of regulatory contexts in the 5'-UTR of plant A. thaliana, which may be potentially important for efficient translation of mRNA.
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