Abstract:
:Scrutiny of the zebrafish (Danio rerio) genomic database confirmed eight functional vitellogenin (vtg) genes, each with one or two transcript variants, and the encoded Vtg polypeptides were structurally and functionally characterized in detail by in silico and experimental analyses. There were five type I (vtgs1, 4, 5, 6, and 7), two type II (vtg2 and vtg8), and one type III (vtg3) vtg gene(s) encoding three major types of Vtg protein based on subdomain structure (Vtg-I, Vtg-II, and Vtg-III, respectively). Among various tissues of mature zebrafish, transcripts of the eight vtg genes were detected by RNA-Seq only in liver and intestine, with liver being the main site of vtg expression. All vtg transcripts except vtg8 were also detected in mature female liver by RT-qPCR. The relative abundances of Vtg proteins and their variants were quantified by LC-MS/MS in the liver of mature females and in eggs. The Vtgs were generally several fold more abundant in eggs, but profiles of abundance of the 19 different forms of Vtg evaluated were otherwise similar in liver and eggs, suggesting that yolk protein composition is determined largely by hepatic Vtg synthesis and secretion. Based on transcript and protein levels, Vtg-I is, by far, the dominant type of Vtg in zebrafish, followed by Vtg-II and then Vtg-III. When relative abundances of the different forms of Vtg were evaluated by LC-MS/MS in egg batches of good versus poor quality, no differences in the proportional abundance of individual forms of Vtg, or of different Vtg types, attributable to egg quality were observed.
journal_name
Fish Physiol Biochemjournal_title
Fish physiology and biochemistryauthors
Yilmaz O,Patinote A,Nguyen T,Bobe Jdoi
10.1007/s10695-018-0524-ysubject
Has Abstractpub_date
2018-12-01 00:00:00pages
1509-1525issue
6eissn
0920-1742issn
1573-5168pii
10.1007/s10695-018-0524-yjournal_volume
44pub_type
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