http://scholars.ntou.edu.tw/handle/123456789/6153
標題: | Regional genetic diversity for NNV grouper viruses across the Indo-Asian region - implications for selecting virus resistance in farmed groupers | 作者: | Knibb, Wayne Giang Luu Premachandra, H. K. A. Lu, Ming-Wei Nguyen Hong Nguyen |
關鍵字: | VIRAL NERVOUS NECROSIS;GADUS-MORHUA L.;MARINE FISH;BETANODAVIRUS;ENCEPHALOPATHY;RETINOPATHY;NODAVIRUSES;AQUACULTURE;VIBRIOSIS;PROTEIN | 公開日期: | 6-九月-2017 | 出版社: | NATURE PUBLISHING GROUP | 卷: | 7 | 來源出版物: | SCI REP-UK | 摘要: | Grouper aquaculture around Asia is impacted by the nervous necrosis virus (NNV) and, in response, host resistance to this infection is being considered as a trait for selection. However efficient selection may be confounded if there are different genetic strains of NNV within and between regions and over years. This study uses statistical approaches and assessment of characteristic attributes (i.e. nucleotide positions that discriminate among strains) to assess whether published and new NNV RNA2 cds sequences show genetic differentiation over geography, host species and years. Rather clear evidence was found for regional strains of NNV. Interestingly, most of the geographic defining characteristic attributes were in codon position three, and not translated into differences for the protein capsid (i.e. they were synonymous variations), suggesting that while NNV strains were geographically isolated and had diverged in different regions for RNA sequences, selection had largely conserved the protein sequences among regions. The apparent selection constraint on the capsid protein may mitigate the risk that despite geographic subdivision, NNV strain variability will confound genetic selection for host resistance. The existence of regional Asian NNV strains may suggest that hatcheries are at risk from NNV not only from imported material but also from endemic reservoirs. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/6153 | ISSN: | 2045-2322 | DOI: | 10.1038/s41598-017-11263-4 |
顯示於: | 水產養殖學系 14 LIFE BELOW WATER |
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