Abstract:
:Small RNAs influence the gene expression at the post-transcriptional level by guiding messenger RNA (mRNA) cleavage, translational repression, and chromatin modifications. In addition to model plants, the microRNAs (miRNAs) have been identified in different crop species. In this work, we developed a specific pipeline to search for coffee miRNA homologs on expressed sequence tags (ESTs) and genome survey sequences (GSS) databases. As a result, 36 microRNAs were identified and a total of 616 and 362 potential targets for Coffea arabica and Coffea canephora, respectively. The evolutionary analyses of these molecules were performed by comparing the primary and secondary structures of precursors and mature miRNAs with their orthologs. Moreover, using a stem-loop RT-PCR assay, we evaluated the accumulation of mature miRNAs in genomes with different ploidy levels, detecting an increase in the miRNAs accumulation according to the ploidy raising. Finally, a 5' RACE (Rapid Amplification of cDNA Ends) assay was performed to verify the regulation of auxin responsive factor 8 (ARF8) by MIR167 in coffee plants. The great variety of target genes indicates the functional plasticity of these molecules and reinforces the importance of understanding the RNAi-dependent regulatory mechanisms. Our results expand the study of miRNAs and their target genes in this crop, providing new challenges to understand the biology of these species.
journal_name
Appl Biochem Biotechnoljournal_title
Applied biochemistry and biotechnologyauthors
Chaves SS,Fernandes-Brum CN,Silva GF,Ferrara-Barbosa BC,Paiva LV,Nogueira FT,Cardoso TC,Amaral LR,de Souza Gomes M,Chalfun-Junior Adoi
10.1007/s12010-015-1785-xsubject
Has Abstractpub_date
2015-10-01 00:00:00pages
879-908issue
4eissn
0273-2289issn
1559-0291pii
10.1007/s12010-015-1785-xjournal_volume
177pub_type
杂志文章abstract::In this study, immobilization conditions and bioethanol production characteristics of immobilized Saccharomyces bayanus were investigated into sodium alginate-graft-poly(N-vinyl-2-pyrrolidone; NaAlg-g-PVP) matrix. The matrix that crosslinked with calcium clorid was used for immobilization of S. bayanus. Bioethanol pro...
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journal_title:Applied biochemistry and biotechnology
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