MHC polymorphism and disease resistance to Singapore grouper iridovirus (SGIV) in the orange-spotted grouper, Epinephelus coioides

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院海洋生物资源可持续利用重点实验室

	MHC polymorphism and disease resistance to Singapore grouper iridovirus (SGIV) in the orange-spotted grouper, Epinephelus coioides
	Yang, Min; Wei, Jingguang; Li, Pengfei; Wei, Shina; Huang, Youhua; Qin, Qiwei
刊名	SCIENCE BULLETIN
	2016
卷号	61 期号:9 页码:693-699
关键词	Orange-spotted grouper Major histocompatibility complex II beta Singapore grouper iridovirus Disease resistance
通讯作者	Qin, QW (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China.
中文摘要	Major histocompatibility complex (MHC) genes are critical members in both innate and adaptive immunity, and the association between their polymorphism and disease resistance has been reported in many teleosts. In the present study, we first investigated the genetic variation at the MHC II beta gene in orange-spotted grouper (Epinephelus coioides) after a challenge with Singapore grouper iridovirus (SGIV). The results reveal that a high polymorphism level of the MHC II beta gene (H = 1.000; K = 20.206; pi = 0.081) and at least three loci exist in grouper. The rate of dN/dS in the peptide-binding region (PBR) and non-PBR were both >1, suggesting the loci were evolving under positive selection. A high ratio of heterozygous individuals (37.26 %) and high rate of dN/dS were discovered, suggesting that both heterozygote advantage and frequency-dependent selection might result in the high polymorphism levels in MHC II beta genes in grouper. A total of 33 MHC II beta alleles were identified from 40 high-susceptibility (HS) and 40 high-resistance group (HR) individuals, and 15 alleles were used in the association analysis. Three alleles, EPCO-DBB0302, EPCO-DBB0307, EPCO-DBB0603, and EPCO-DBB1001 were significantly associated with resistance ability to SGIV, and the EPCO-DBB0607 and EPCO-DBB1303 alleles were associated with susceptibility (P < 0.05). To further confirm the association, another independent challenge experiment was performed. The result of association analysis in the verification test found that only EPCO-DBB* 1001 alleles were significantly associated with resistance to SGIV (P < 0.05), while the other alleles showed no significance (P > 0.05) in the frequency distribution between HR and HS groups. Therefore, the EPCO-DBB*1001 alleles could be used as a disease resistance-related MHC marker in the molecular marker-assisted selective breeding program of grouper.
学科主题	Science & Technology - Other Topics
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/15423]
专题	南海海洋研究所_中科院海洋生物资源可持续利用重点实验室
推荐引用方式 GB/T 7714	Yang, Min,Wei, Jingguang,Li, Pengfei,et al. MHC polymorphism and disease resistance to Singapore grouper iridovirus (SGIV) in the orange-spotted grouper, Epinephelus coioides[J]. SCIENCE BULLETIN,2016,61(9):693-699.
APA	Yang, Min,Wei, Jingguang,Li, Pengfei,Wei, Shina,Huang, Youhua,&Qin, Qiwei.(2016).MHC polymorphism and disease resistance to Singapore grouper iridovirus (SGIV) in the orange-spotted grouper, Epinephelus coioides.SCIENCE BULLETIN,61(9),693-699.
MLA	Yang, Min,et al."MHC polymorphism and disease resistance to Singapore grouper iridovirus (SGIV) in the orange-spotted grouper, Epinephelus coioides".SCIENCE BULLETIN 61.9(2016):693-699.