Bioinformatics
Mohammad Mohsenzadeh Golfazani; Alireza Tarang; Ramin Seighalani
Abstract
There is much information about the regulation of gene expression in response to various stresses at the transcriptional level. Nevertheless, there is limited information about this process at the post-transcriptional level. The diversity and complexity of miRNA regulation indicates their importance ...
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There is much information about the regulation of gene expression in response to various stresses at the transcriptional level. Nevertheless, there is limited information about this process at the post-transcriptional level. The diversity and complexity of miRNA regulation indicates their importance in biological processes. Many miRNA regulatory modules can form a complex miRNA-mRNA regulatory network. Therefore, research on miRNA-mRNA regulatory networks can provide valuable information for understanding complex biological processes. These data are very important to further study the stress tolerance mechanisms in plants, especially in rapeseed. In this research, the selection of miRNAs related to drought and salinity stress was made by reviewing the articles on abiotic stresses. Then the target genes were identified using the sequences of mature miRNAs and psRNATarget online software. A gene list of 225 identified target genes was prepared using the UniProt database. Their functional pathway was identified utilizing the DAVID bioinformatics database and KEGG database according to default parameters. Investigations showed that these target genes were involved in several biological pathways including ribosome, spliceosome, proteasome, purine metabolism, selenocompound metabolism, and sulfur metabolism. In addition, the STRING database was used to check co-expression genes. Our result indicated the existence of 37 co-expression genes among the identified target genes.
Bioinformatics
Mohammad Mahdi Taghvaei; Habibollah Habibollah Samizadeh Lahiji; Mohammad Reza Bakhtiarizadeh; Mohammad Mohsenzadeh Golafazani
Abstract
Rapeseed (Brassica napus) is one of the most important oil plants in the world. Not only it has rich sources of fatty acids, but also contains protein. Cold stress is one of the growth limiting factors for this plant, which causes massive molecular changes inside the plant. In this research miRNAs, bna-miR164a, ...
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Rapeseed (Brassica napus) is one of the most important oil plants in the world. Not only it has rich sources of fatty acids, but also contains protein. Cold stress is one of the growth limiting factors for this plant, which causes massive molecular changes inside the plant. In this research miRNAs, bna-miR164a, bra-miR5712, bra-miR5717, bna-miR6029, bna-miR6035, bna-N_miR2, bna-N_miR16 that previously had been studied separately in cold and fatty acid biosynthesis, were selected for investigation of the relationship between microRNAs, Cold stress, Fatty Acids and Lipids. Afterwards, bioinformatics prediction of target genes, investigation of gene ontology and their functional pathway and mapping of protein interactions network were performed. As a result, it was discovered that miRNAs which are effective in cold stress, beside regulation of target genes such as SCRM2, HOS1, STZ, GLP4, PP2CA, which are responsible for cold response and thermal stimulus-response, also have regulatory roles on other target genes such as KAS2, FAD8, FAD4, AAD3, FAD7, FAD2 which are involved in biological processes such as unsaturated fatty acid biosynthesis, unsaturated fatty acid metabolism, fatty acid biosynthesis, fatty acid metabolism, cellular lipid catabolism and lipid metabolism, lipid biosynthesis, cellular lipid metabolism. Evaluation of Protein-Protein Interactions revealed that there was a relation between the target genes involved in fatty acid biosynthesis and the target genes involved in cold stress. The next step for subsequent research is to investigate the expression of these miRNAs and their target genes during cold stress and further experimental verifications to prove the regulatory relationship between them.
