Post-transcriptional gene regulation occurs by different mechanisms, one of them is the regulation by small RNAs (sRNAs), which are regulatory elements non-coding. In plants, among different classes of sRNAs, micro-RNAs (miRNAs) are the most studied in various development processes, including embryogenesis. However, in gymnosperms, the functions of specifics miRNAs in the regulation of genes during somatic embryogenesis were not totally elucidated. In Araucaria angustifolia, an endangered native conifer with economic importance, studies performed in embryogenic cultures using platforms of transcripts and proteome have been revealed the participation of post-transcriptional regulation mechanisms. Comparative studies between zygotic and somatic embryogenesis, and between two cell lines with distinct embryogenic potential, have been used for a better comprehension of physiological, biochemical and molecular aspects of embryogenesis. The present project aims to comprehend the mechanisms of post-transcriptional gene regulation and their correlation with somatic embryogenesis process. For this, will be performed an analysis of sRNAs profile, as well as the identification of miRNAs and their target genes, in two cell lines of A. angustifolia, with distinct embryogenic potential. The obtained results will be evaluated considering the transcriptome and proteome platforms of A. angustifolia, built in the BIOCEL. This propose will introduce new approaches in the studies of the mechanisms that regulate the embryogenesis in gymnosperms, specifically in A. angustifolia, and may also to elucidate new aspects related to post-transcriptional regulation in this plant system and, finally, will help the optimization of in vitro culture conditions for the somatic embryogenesis.
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