Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/26542
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Hnf4α is involved in the regulation of vertebrate LC-PUFA biosynthesis: insights into the regulatory role of Hnf4α on expression of liver fatty acyl desaturases in the marine teleost Siganus canaliculatus
Author(s): Wang, Shuqi
Chen, Junliang
Jiang, Danli
Zhang, Qinghao
You, Cuihong
Tocher, Douglas R
Monroig, Oscar
Dong, Yewei
Li, Yuanyou
Contact Email: oscar.monroig@stir.ac.uk
Keywords: fatty acyl desaturase
LC-PUFA biosynthesis
Hnf4α
transcriptional regulation mechanism
rabbitfish Siganus canaliculatus
Issue Date: 1-Jun-2018
Citation: Wang S, Chen J, Jiang D, Zhang Q, You C, Tocher DR, Monroig O, Dong Y & Li Y (2018) Hnf4α is involved in the regulation of vertebrate LC-PUFA biosynthesis: insights into the regulatory role of Hnf4α on expression of liver fatty acyl desaturases in the marine teleost Siganus canaliculatus. Fish Physiology and Biochemistry, 44 (3), pp. 805-815. https://doi.org/10.1007/s10695-018-0470-8.
Abstract: Long chain polyunsaturated fatty acid (LC-PUFA) biosynthesis is an important metabolic pathway in vertebrates, especially fish, considering they are the major source of n-3 LC-PUFA in the human diet. However, most fish have only limited capability for biosynthesis of LC-PUFA. The rabbitfish (Siganus canaliculatus) is able to synthesize LC-PUFA as it has all the key enzyme activities required including Δ6Δ5 Fads2, Δ4 Fads2, Elovl5 and Elovl4. We previously reported a direct interaction between the transcription factor Hnf4α and the promoter regions of Δ4 and Δ6Δ5 Fads2, which suggested that Hnf4α was involved in the transcriptional regulation of fads2 in rabbitfish. For further functionally investigating it, a full-length cDNA of 1736 bp encoding rabbitfish Hnf4α with 454 amino acids was cloned, which was highly expressed in intestine, followed by liver and eyes. Similar to the expression characteristics of its target genes Δ4 and Δ6Δ5 fads2, levels of hnf4α mRNA in liver and eyes were higher in fish reared at low salinity than those reared in high salinity. After the rabbitfish primary hepatocytes were respectively incubated with Alverine, Benfluorex or BI6015, which were anticipated agonists or antagonist for Hnf4α, the mRNA level of Δ6Δ5 and Δ4 fads2 displayed a similar change tendency with that of hnf4α mRNA. Furthermore, when the mRNA level of hhf4α was knocked down using siRNA, the expression of Δ6Δ5 and Δ4 fads2 also decreased. Together, these data suggest that Hnf4α is involved in the transcriptional regulation of LC-PUFA biosynthesis, specifically, by targeting Δ4 and Δ6Δ5 fads2 in rabbitfish.
DOI Link: 10.1007/s10695-018-0470-8
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This is a post-peer-review, pre-copyedit version of an article published in Fish Physiology and Biochemistry. The final authenticated version is available online at: http://dx.doi.org/10.1007/s10695-018-0470-8

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