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Journal Article
Research Support, Non-U.S. Gov't
Understanding microRNA Regulation Involved in the Metamorphosis of the Veined Rapa Whelk ( Rapana venosa ).
G3 : Genes - Genomes - Genetics 2017 December 5
The veined rapa whelk ( Rapana venosa ) is widely consumed in China. Nevertheless, it preys on oceanic bivalves, thereby reducing this resource worldwide. Its larval metamorphosis comprises a transition from pelagic to benthic form, which involves considerable physiological and structural changes and has vital roles in its natural populations and commercial breeding. Thus, understanding the endogenous microRNAs (miRNAs) that drive metamorphosis is of great interest. This is the first study to use high-throughput sequencing to examine the alterations in miRNA expression that occur during metamorphosis in a marine gastropod. A total of 195 differentially expressed miRNAs were obtained. Sixty-five of these were expressed during the transition from precompetent to competent larvae. Thirty-three of these were upregulated and the others were downregulated. Another 123 miRNAs were expressed during the transition from competent to postlarvae. Ninety-six of these were upregulated and the remaining 27 were downregulated. The expression of miR-276-y, miR-100-x, miR-183-x, and miR-263-x showed a >100-fold change during development, while the miR-242-x and novel-m0052-3p expression levels changed over 3000-fold. Putative target gene coexpression, gene ontology, and pathway analyses suggest that these miRNAs play important parts in cell proliferation, migration, apoptosis, metabolic regulation, and energy absorption. Twenty miRNAs and their target genes involved in ingestion, digestion, cytoskeleton, cell adhesion, and apoptosis were identified. Nine of them were analyzed with real-time polymerase chain reaction (PCR), which showed an inverse correlation between the miRNAs and their relative expression levels. Our data elucidate the role of miRNAs in R. venosa metamorphic transition and serve as a solid basis for further investigations into regulatory mechanisms of gastropod metamorphosis.
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