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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: The miR-33 gene is identified in a marine teleost: a potential role in regulation of LC-PUFA biosynthesis in Siganus canaliculatus
Author(s): Zhang, Qinghao
You, Cuihong
Wang, Shuqi
Dong, Yewei
Monroig, Oscar
Tocher, Douglas R
Li, Yuanyou
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Keywords: Gene regulation
Issue Date: 19-Sep-2016
Date Deposited: 5-Nov-2016
Citation: Zhang Q, You C, Wang S, Dong Y, Monroig O, Tocher DR & Li Y (2016) The miR-33 gene is identified in a marine teleost: a potential role in regulation of LC-PUFA biosynthesis in Siganus canaliculatus. Scientific Reports, 6, Art. No.: 32909.
Abstract: As the first marine teleost demonstrated to have the ability to biosynthesize long-chain polyunsaturated fatty acids (LC-PUFA) from C18PUFA precursors, rabbitfishSiganus canaliculatusprovides a good model for studying the regulatory mechanisms of LC-PUFA biosynthesis in teleosts. Here the potential roles of miR-33 in such regulation were investigated. The miR-33 gene was identified within intron 16 of the gene encoding sterol regulatory element-binding protein 1 (Srebp1), an activator of LC-PUFA biosynthesis. Expression of miR-33 in rabbitfish tissues correlated with that ofsrebp1, while its expression in liver was highly responsive to ambient salinities and PUFA components, factors affecting LC-PUFA biosynthesis. Srebp1 activation promoted the expression of Δ4 and Δ6 Δ5 fatty acyl desaturases (Fad), key enzymes for LC-PUFA biosynthesis, accompanied by elevated miR-33 abundance in rabbitfish hepatocytes. miR-33 overexpression induced the expression of the twofad, but suppressed that of insulin-induced gene 1 (insig1), which encodes a repressor blocking Srebp proteolytic activation and has targeting sites of miR-33. These results indicated that miR-33, cooperating with Srebp1, may be involved in regulation of LC-PUFA biosynthesis by facilitatingfadexpression, probably through targetinginsig1. To our knowledge, this is the first report of the participation of miR-33 in LC-PUFA biosynthesis in vertebrates.
DOI Link: 10.1038/srep32909
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