SNP‐based susceptibility–resistance association and mRNA expression regulation analyses of tlr7 to grass carp Ctenopharyngodon idella reovirus |
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| Authors: | J J Su X Y Shang Q Y Wan J G Su |
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| Affiliation: | 1. College of Animal Science and Technology, Northwest A&F University, Yangling, China;2. College of Fisheries, Huazhong Agricultural University, Wuhan, China;3. Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, China |
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| Abstract: | Eleven single nucleotide polymorphisms (SNP) in Ctenopharyngodon idella toll‐like receptor 7 (citlr7) gene, containing two in the 5′‐flanking region, three within the single intron and six distributed in the coding sequence (CDS), were identified. A case–control study of 73 susceptible individuals and 67 resistant individuals was conducted to test the SNPs‐based susceptibility–resistance association and mRNA expression of citlr7 to grass carp reovirus (GCRV), showing that both 820 A/G and 1726 A/G were significantly correlative sites in genotype (P < 0·05). Multifactor dimensionality reduction (MDR) analysis suggested the exertion of antiviral effects of 820 A/G might rely on SNPs interactions of citlr7 and C. idella toll‐like receptor 8 (citlr8). Combining the mortality rate and citlr7 mRNA expression, it was suggested that 1726 GG‐genotyped individuals might be more resistant than 1726 A/G genotyped individuals, indicating the selection on synonymous mutations in 1726 A/G might be susceptibility–resistance‐type specific. In addition, haplotype analysis uncovered no significantly correlative haplotypes in citlr7. These findings may provide an in‐depth insight for the further functional research of citlr7. The potential genetic markers identified may contribute to the molecular and transgenic breeding of C. idella. |
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| Keywords: | antiviral innate immunity grass carp reovirus single nucleotide polymorphism toll‐like receptor 7 |
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